www.pudn.com > openh323-v1_15_1-src.zip > h323con.h
/* * h323con.h * * H.323 protocol handler * * Open H323 Library * * Copyright (c) 1998-2001 Equivalence Pty. Ltd. * * The contents of this file are subject to the Mozilla Public License * Version 1.0 (the "License"); you may not use this file except in * compliance with the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See * the License for the specific language governing rights and limitations * under the License. * * The Original Code is Open H323 Library. * * The Initial Developer of the Original Code is Equivalence Pty. Ltd. * * Portions of this code were written with the assisance of funding from * Vovida Networks, Inc. http://www.vovida.com. * * Contributor(s): ______________________________________. * * $Log: h323con.h,v $ * Revision 1.74 2004/09/27 08:25:14 csoutheren * Changed in-header documentation for external headers to reflect changes * in external RTP interface * * Revision 1.73 2004/09/07 22:50:55 rjongbloed * Changed usage of template function as MSVC6 will not compile it. * * Revision 1.72 2004/09/03 01:06:09 csoutheren * Added initial hooks for H.460 GEF * Thanks to Simon Horne and ISVO (Asia) Pte Ltd. for this contribution * * Revision 1.71 2004/07/13 10:19:40 csoutheren * Fixed cut & paste errors in comments * * Revision 1.70 2004/06/15 03:30:00 csoutheren * Added OnSendARQ to allow access to the ARQ message before sent by connection * * Revision 1.69 2004/04/20 05:24:54 csoutheren * Added ability to specify Q.931 DisplayName * * Revision 1.68 2004/04/13 05:50:50 csoutheren * Added function to get access to the connection NAT flag * * Revision 1.67 2004/04/07 05:31:42 csoutheren * Added ability to receive calls from endpoints behind NAT firewalls * * Revision 1.66 2004/03/04 04:48:29 csoutheren * Added virtual keyword to allow overring of capability management functions * Added additional response code needed for MCU * * Revision 1.65 2004/02/26 08:32:47 csoutheren * Added release complete codes for MCU * * Revision 1.64 2003/12/28 02:38:14 csoutheren * Added H323EndPoint::OnOutgoingCall * * Revision 1.63 2003/12/14 10:42:29 rjongbloed * Changes for compilability without video support. * * Revision 1.62 2003/10/27 06:03:38 csoutheren * Added support for QoS * Thanks to Henry Harrison of AliceStreet * * Revision 1.61 2003/10/09 09:47:45 csoutheren * Fixed problem with re-opening RTP half-channels under unusual * circumstances. Thanks to Damien Sandras * * Revision 1.60 2003/04/30 00:28:50 robertj * Redesigned the alternate credentials in ARQ system as old implementation * was fraught with concurrency issues, most importantly it can cause false * detection of replay attacks taking out an endpoint completely. * * Revision 1.59 2003/02/12 23:59:22 robertj * Fixed adding missing endpoint identifer in SETUP packet when gatekeeper * routed, pointed out by Stefan Klein * Also fixed correct rutrn of gk routing in IRR packet. * * Revision 1.58 2002/11/27 06:54:52 robertj * Added Service Control Session management as per Annex K/H.323 via RAS * only at this stage. * Added H.248 ASN and very primitive infrastructure for linking into the * Service Control Session management system. * Added basic infrastructure for Annex K/H.323 HTTP transport system. * Added Call Credit Service Control to display account balances. * * Revision 1.57 2002/11/15 05:17:22 robertj * Added facility redirect support without changing the call token for access * to the call. If it gets redirected a new H323Connection object is * created but it looks like the same thing to an application. * * Revision 1.56 2002/11/13 04:37:23 robertj * Added ability to get (and set) Q.931 release complete cause codes. * * Revision 1.55 2002/11/10 06:17:26 robertj * Fixed minor documentation errors. * * Revision 1.54 2002/11/05 00:24:09 robertj * Added function to determine if Q.931 CONNECT sent/received. * * Revision 1.53 2002/10/31 00:31:47 robertj * Enhanced jitter buffer system so operates dynamically between minimum and * maximum values. Altered API to assure app writers note the change! * * Revision 1.52 2002/09/16 01:14:15 robertj * Added #define so can select if #pragma interface/implementation is used on * platform basis (eg MacOS) rather than compiler, thanks Robert Monaghan. * * Revision 1.51 2002/09/03 06:19:36 robertj * Normalised the multi-include header prevention ifdef/define symbol. * * Revision 1.50 2002/08/05 10:03:47 robertj * Cosmetic changes to normalise the usage of pragma interface/implementation. * * Revision 1.49 2002/08/05 05:17:37 robertj * Fairly major modifications to support different authentication credentials * in ARQ to the logged in ones on RRQ. For both client and server. * Various other H.235 authentication bugs and anomalies fixed on the way. * * Revision 1.48 2002/07/05 02:22:56 robertj * Added support for standard and non-standard T.38 mode change. * * Revision 1.47 2002/07/04 00:40:31 robertj * More H.450.11 call intrusion implementation, thanks Aleksandar Todorovic * * Revision 1.46 2002/06/22 06:11:30 robertj * Fixed bug on sometimes missing received endSession causing 10 second * timeout in connection clean up. * * Revision 1.45 2002/06/22 05:48:38 robertj * Added partial implementation for H.450.11 Call Intrusion * * Revision 1.44 2002/06/13 06:15:19 robertj * Allowed TransferCall() to be used on H323Connection as well as H323EndPoint. * * Revision 1.43 2002/06/05 08:58:58 robertj * Fixed documentation of remote application name string. * Added missing virtual keywards on some protocol handler functions. * * Revision 1.42 2002/05/29 06:40:29 robertj * Changed sending of endSession/ReleaseComplete PDU's to occur immediately * on call clearance and not wait for background thread to do it. * Stricter compliance by waiting for reply endSession before closing down. * * Revision 1.41 2002/05/29 03:55:17 robertj * Added protocol version number checking infrastructure, primarily to improve * interoperability with stacks that are unforgiving of new features. * * Revision 1.40 2002/05/21 09:32:49 robertj * Added ability to set multiple alias names ona connection by connection * basis, defaults to endpoint list, thanks Artis Kugevics * * Revision 1.39 2002/05/15 23:59:33 robertj * Added memory management of created T.38 and T.120 handlers. * Improved documentation for use of T.38 and T.120 functions. * Added ability to initiate a mode change for non-standard T.38 * * Revision 1.38 2002/05/07 01:31:51 dereks * Fix typo in documentation. * * Revision 1.37 2002/05/03 05:38:15 robertj * Added Q.931 Keypad IE mechanism for user indications (DTMF). * * Revision 1.36 2002/05/02 07:56:24 robertj * Added automatic clearing of call if no media (RTP data) is transferred in a * configurable (default 5 minutes) amount of time. * * Revision 1.35 2002/04/25 20:55:25 dereks * Fix documentation. Thanks Olaf Schulz. * * Revision 1.34 2002/04/17 00:50:34 robertj * Added ability to disable the in band DTMF detection. * * Revision 1.33 2002/03/27 06:04:42 robertj * Added Temporary Failure end code for connection, an application may * immediately retry the call if this occurs. * * Revision 1.32 2002/02/11 04:20:48 robertj * Fixed documentation errors, thanks Horacio J. Peņa * * Revision 1.31 2002/02/11 04:16:37 robertj * Fixed bug where could send DRQ if never received an ACF. * * Revision 1.30 2002/02/06 06:30:47 craigs * Fixed problem whereby MSD/TCS was stalled if H245 was included in * SETUP, but other end did not respond * * Revision 1.29 2002/02/04 07:17:52 robertj * Added H.450.2 Consultation Transfer, thanks Norwood Systems. * * Revision 1.28 2002/01/25 05:20:05 robertj * Moved static strings for enum printing to inside of function, could crash with DLL's * * Revision 1.27 2002/01/24 06:29:02 robertj * Added option to disable H.245 negotiation in SETUP pdu, this required * API change so have a bit mask instead of a series of booleans. * * Revision 1.26 2002/01/23 12:45:37 rogerh * Add the DTMF decoder. This identifies DTMF tones in an audio stream. * * Revision 1.25 2002/01/23 07:12:48 robertj * Added hooks for in band DTMF detection. Now need the detector! * * Revision 1.24 2002/01/22 22:48:21 robertj * Fixed RFC2833 support (transmitter) requiring large rewrite * * Revision 1.23 2002/01/18 06:02:08 robertj * Added some H323v4 functions (fastConnectRefused & TCS in SETUP) * * Revision 1.22 2002/01/17 07:04:58 robertj * Added support for RFC2833 embedded DTMF in the RTP stream. * * Revision 1.21 2002/01/14 00:05:24 robertj * Added H.450.6, better H.450.2 error handling and and Music On Hold. * Added destExtraCallInfo field for ARQ. * Thanks Ben Madsen of Norwood Systems * * Revision 1.20 2002/01/10 05:13:50 robertj * Added support for external RTP stacks, thanks NuMind Software Systems. * * Revision 1.19 2002/01/09 00:21:36 robertj * Changes to support outgoing H.245 RequstModeChange. * * Revision 1.18 2001/12/22 03:20:31 robertj * Added create protocol function to H323Connection. * * Revision 1.17 2001/12/22 03:09:36 robertj * Changed OnRequstModeChange to return ack, then actually do the change. * * Revision 1.16 2001/12/22 01:52:54 robertj * Added more support for H.245 RequestMode operation. * * Revision 1.15 2001/12/15 08:09:54 robertj * Added alerting, connect and end of call times to be sent to RAS server. * * Revision 1.14 2001/12/13 10:54:23 robertj * Added ability to automatically add ACF access token to SETUP pdu. * * Revision 1.13 2001/11/01 06:11:54 robertj * Plugged very small mutex hole that could cause crashes. * * Revision 1.12 2001/11/01 00:27:33 robertj * Added default Fast Start disabled and H.245 tunneling disable flags * to the endpoint instance. * * Revision 1.11 2001/10/24 00:54:13 robertj * Made cosmetic changes to H.245 miscellaneous command function. * * Revision 1.10 2001/10/23 02:18:06 dereks * Initial release of CU30 video codec. * * Revision 1.9 2001/09/26 06:20:56 robertj * Fixed properly nesting connection locking and unlocking requiring a quite * large change to teh implementation of how calls are answered. * * Revision 1.8 2001/09/19 03:30:53 robertj * Added some support for overlapped dialing, thanks Chris Purvis & Nick Hoath. * * Revision 1.7 2001/09/13 06:48:13 robertj * Added call back functions for remaining Q.931/H.225 messages. * Added call back to allow modification of Release Complete,thanks Nick Hoath * * Revision 1.6 2001/09/12 06:57:58 robertj * Added support for iNow Access Token from gk, thanks Nick Hoath * * Revision 1.5 2001/09/12 06:04:36 robertj * Added support for sending UUIE's to gk on request, thanks Nick Hoath * * Revision 1.4 2001/09/11 01:24:36 robertj * Added conditional compilation to remove video and/or audio codecs. * * Revision 1.3 2001/08/22 06:54:50 robertj * Changed connection locking to use double mutex to guarantee that * no threads can ever deadlock or access deleted connection. * * Revision 1.2 2001/08/16 07:49:16 robertj * Changed the H.450 support to be more extensible. Protocol handlers * are now in separate classes instead of all in H323Connection. * * Revision 1.1 2001/08/06 03:08:11 robertj * Fission of h323.h to h323ep.h & h323con.h, h323.h now just includes files. * */ #ifndef __OPAL_H323CON_H #define __OPAL_H323CON_H #ifdef P_USE_PRAGMA #pragma interface #endif #include#include "h323caps.h" #include "transports.h" #include "channels.h" #include "guid.h" #include "openh323buildopts.h" /* The following classes have forward references to avoid including the VERY large header files for H225 and H245. If an application requires access to the protocol classes they can include them, but for simple usage their inclusion can be avoided. */ class PPER_Stream; class H225_EndpointType; class H225_TransportAddress; class H225_ArrayOf_PASN_OctetString; class H225_ProtocolIdentifier; class H225_AdmissionRequest; class H225_FeatureSet; class H245_TerminalCapabilitySet; class H245_TerminalCapabilitySetReject; class H245_OpenLogicalChannel; class H245_OpenLogicalChannelAck; class H245_TransportAddress; class H245_UserInputIndication; class H245_RequestMode; class H245_RequestModeAck; class H245_RequestModeReject; class H245_ModeDescription; class H245_ArrayOf_ModeDescription; class H245_SendTerminalCapabilitySet; class H245_MultiplexCapability; class H245_FlowControlCommand; class H245_MiscellaneousCommand; class H245_MiscellaneousIndication; class H245_JitterIndication; class H323SignalPDU; class H323ControlPDU; class H235Authenticators; class H245NegMasterSlaveDetermination; class H245NegTerminalCapabilitySet; class H245NegLogicalChannels; class H245NegRequestMode; class H245NegRoundTripDelay; class H450xDispatcher; class H4502Handler; class H4504Handler; class H4506Handler; class H45011Handler; class OpalT120Protocol; class OpalT38Protocol; class OpalRFC2833; class OpalRFC2833Info; /////////////////////////////////////////////////////////////////////////////// /**This class represents a particular H323 connection between two endpoints. There are at least two threads in use, this one to look after the signalling channel, an another to look after the control channel. There would then be additional threads created for each data channel created by the control channel protocol thread. */ class H323Connection : public PObject { PCLASSINFO(H323Connection, PObject); public: /**@name Construction */ //@{ enum Options { FastStartOptionDisable = 0x0001, FastStartOptionEnable = 0x0002, FastStartOptionMask = 0x0003, H245TunnelingOptionDisable = 0x0004, H245TunnelingOptionEnable = 0x0008, H245TunnelingOptionMask = 0x000c, H245inSetupOptionDisable = 0x0010, H245inSetupOptionEnable = 0x0020, H245inSetupOptionMask = 0x0030, DetectInBandDTMFOptionDisable= 0x0040, DetectInBandDTMFOptionEnable = 0x0080, DetectInBandDTMFOptionMask = 0x00c0, }; /**Create a new connection. */ H323Connection( H323EndPoint & endpoint, /// H323 End Point object unsigned callReference, /// Call reference unsigned options = 0 /// Connection option bits ); /**Destroy the connection */ ~H323Connection(); /**Lock connection. When any thread wants exclusive use of the connection, it must use this function to gain the mutex. Note this is not a simple mutex to allow for the rather complicated mechanism for preventing deadlocks in associated threads to the connection (eg Q.931 reader thread). Returns FALSE if the lock was not obtainable due to the connection being shut down. */ BOOL Lock(); /**Try to lock connection. When the H323EndPoint::FindConnectionWithLock() function is used to gain access to a connection object, this is called to prevent it from being closed and deleted by the background threads. Note this is an internal function and it is not expected an application would use it. Returns 0 if the lock was not obtainable due to the connection being shut down, -1 if it was not available, and +1 if lock is obtained. */ int TryLock(); /**Unlock connection. If the H323EndPoint::FindConnectionWithLock() function is used to gain access to a connection object, this MUST be called to allow it to subsequently be closed and disposed of. */ void Unlock(); /** * called when an ARQ needs to be sent to a gatekeeper. This allows the connection * to change or check fields in the ARQ before it is sent. * * By default, this calls the matching function on the endpoint */ virtual void OnSendARQ( H225_AdmissionRequest & arq ); /** Called when a connection is established. Default behaviour is to call H323EndPoint::OnConnectionEstablished */ virtual void OnEstablished(); /** Called when a connection is cleared, just after CleanUpOnCallEnd() Default behaviour is to call H323EndPoint::OnConnectionCleared */ virtual void OnCleared(); /**Determine if the call has been connected. This indicates that Q.931 CONNECT has occurred. This usually means in PSTN gateway environments that a charge will be made for the call. This is not quite the same as IsEstablished() as that indicates the call is connected AND there is media open. */ BOOL IsConnected() const { return connectionState == HasExecutedSignalConnect || connectionState == EstablishedConnection; } /**Determine if the call has been established. This can be used in combination with the GetCallEndReason() function to determine the three main phases of a call, call setup, call established and call cleared. */ BOOL IsEstablished() const { return connectionState == EstablishedConnection; } /**Call clearance reasons. NOTE: if anything is added to this, you also need to add the field to the tables in h323.cxx and h323pdu.cxx. */ enum CallEndReason { EndedByLocalUser, /// Local endpoint application cleared call EndedByNoAccept, /// Local endpoint did not accept call OnIncomingCall()=FALSE EndedByAnswerDenied, /// Local endpoint declined to answer call EndedByRemoteUser, /// Remote endpoint application cleared call EndedByRefusal, /// Remote endpoint refused call EndedByNoAnswer, /// Remote endpoint did not answer in required time EndedByCallerAbort, /// Remote endpoint stopped calling EndedByTransportFail, /// Transport error cleared call EndedByConnectFail, /// Transport connection failed to establish call EndedByGatekeeper, /// Gatekeeper has cleared call EndedByNoUser, /// Call failed as could not find user (in GK) EndedByNoBandwidth, /// Call failed as could not get enough bandwidth EndedByCapabilityExchange,/// Could not find common capabilities EndedByCallForwarded, /// Call was forwarded using FACILITY message EndedBySecurityDenial, /// Call failed a security check and was ended EndedByLocalBusy, /// Local endpoint busy EndedByLocalCongestion, /// Local endpoint congested EndedByRemoteBusy, /// Remote endpoint busy EndedByRemoteCongestion, /// Remote endpoint congested EndedByUnreachable, /// Could not reach the remote party EndedByNoEndPoint, /// The remote party is not running an endpoint EndedByHostOffline, /// The remote party host off line EndedByTemporaryFailure, /// The remote failed temporarily app may retry EndedByQ931Cause, /// The remote ended the call with unmapped Q.931 cause code EndedByDurationLimit, /// Call cleared due to an enforced duration limit EndedByInvalidConferenceID, // Call cleared due to invalid conference ID NumCallEndReasons }; #if PTRACING friend ostream & operator<<(ostream & o, CallEndReason r); #endif /**Get the call clearand reason for this connection shutting down. Note that this function is only generally useful in the H323EndPoint::OnConnectionCleared() function. This is due to the connection not being cleared before that, and the object not even exiting after that. If the call is still active then this will return NumCallEndReasons. */ CallEndReason GetCallEndReason() const { return callEndReason; } /**Set the call clearance reason. An application should have no cause to use this function. It is present for the H323EndPoint::ClearCall() function to set the clearance reason. */ virtual void SetCallEndReason( CallEndReason reason, /// Reason for clearance of connection. PSyncPoint * sync = NULL /// syncpoint to use for synchronous destruction ); /**Clear a current connection. This hangs up the connection to a remote endpoint. It actually just calls the endpoint version of the ClearCall() function to avoid possible multithreading race conditions. */ virtual BOOL ClearCall( CallEndReason reason = EndedByLocalUser /// Reason for call clearing ); /**Clear a current connection, synchronously */ virtual BOOL ClearCallSynchronous( PSyncPoint * sync, CallEndReason reason = EndedByLocalUser /// Reason for call clearing ); /**Clean up the call clearance of the connection. This function will do any internal cleaning up and waiting on background threads that may be using the connection object. After this returns it is then safe to delete the object. An application will not typically use this function as it is used by the H323EndPoint during a clear call. */ virtual void CleanUpOnCallEnd(); //@} /**@name Signalling Channel */ //@{ /**Attach a transport to this connection as the signalling channel. */ void AttachSignalChannel( const PString & token, /// New token to use to identify connection H323Transport * channel, /// Transport for the PDU's BOOL answeringCall /// Flag for if incoming/outgoing call. ); /**Write a PDU to the signalling channel. */ BOOL WriteSignalPDU( H323SignalPDU & pdu /// PDU to write. ); /**Handle reading PDU's from the signalling channel. This is an internal function and is unlikely to be used by applications. */ virtual void HandleSignallingChannel(); /**Handle PDU from the signalling channel. This is an internal function and is unlikely to be used by applications. */ virtual BOOL HandleSignalPDU( H323SignalPDU & pdu /// PDU to handle. ); /**Handle Control PDU tunnelled in the signalling channel. This is an internal function and is unlikely to be used by applications. */ virtual void HandleTunnelPDU( H323SignalPDU * txPDU /// PDU tunnel response into. ); /**Handle an incoming Q931 setup PDU. The default behaviour is to do the handshaking operation calling a few virtuals at certain moments in the sequence. If FALSE is returned the connection is aborted and a Release Complete PDU is sent. */ virtual BOOL OnReceivedSignalSetup( const H323SignalPDU & pdu /// Received setup PDU ); /**Handle an incoming Q931 setup acknowledge PDU. If FALSE is returned the connection is aborted and a Release Complete PDU is sent. The default behaviour does nothing. */ virtual BOOL OnReceivedSignalSetupAck( const H323SignalPDU & pdu /// Received setup PDU ); /**Handle an incoming Q931 information PDU. If FALSE is returned the connection is aborted and a Release Complete PDU is sent. The default behaviour does nothing. */ virtual BOOL OnReceivedSignalInformation( const H323SignalPDU & pdu /// Received setup PDU ); /**Handle an incoming Q931 call proceeding PDU. If FALSE is returned the connection is aborted and a Release Complete PDU is sent. The default behaviour checks for hH245Address field and if present starts the separate H245 channel, if successful or not present it returns TRUE. */ virtual BOOL OnReceivedCallProceeding( const H323SignalPDU & pdu /// Received call proceeding PDU ); /**Handle an incoming Q931 progress PDU. If FALSE is returned the connection is aborted and a Release Complete PDU is sent. The default behaviour checks for hH245Address field and if present starts the separate H245 channel, if successful or not present it returns TRUE. */ virtual BOOL OnReceivedProgress( const H323SignalPDU & pdu /// Received call proceeding PDU ); /**Handle an incoming Q931 alerting PDU. If FALSE is returned the connection is aborted and a Release Complete PDU is sent. The default behaviour obtains the display name and calls OnAlerting(). */ virtual BOOL OnReceivedAlerting( const H323SignalPDU & pdu /// Received Alerting PDU ); /**Handle an incoming Q931 connect PDU. If FALSE is returned the connection is aborted and a Release Complete PDU is sent. The default behaviour checks for hH245Address field and if present starts the separate H245 channel, if successful it returns TRUE. If not present and there is no H245Tunneling then it returns FALSE. */ virtual BOOL OnReceivedSignalConnect( const H323SignalPDU & pdu /// Received connect PDU ); /**Handle an incoming Q931 facility PDU. If FALSE is returned the connection is aborted and a Release Complete PDU is sent. The default behaviour checks for hH245Address field and if present starts the separate H245 channel, if successful or not present it returns TRUE. */ virtual BOOL OnReceivedFacility( const H323SignalPDU & pdu /// Received Facility PDU ); /**Handle an incoming Q931 Notify PDU. If FALSE is returned the connection is aborted and a Release Complete PDU is sent. The default behaviour simply returns TRUE. */ virtual BOOL OnReceivedSignalNotify( const H323SignalPDU & pdu /// Received Notify PDU ); /**Handle an incoming Q931 Status PDU. If FALSE is returned the connection is aborted and a Release Complete PDU is sent. The default behaviour simply returns TRUE. */ virtual BOOL OnReceivedSignalStatus( const H323SignalPDU & pdu /// Received Status PDU ); /**Handle an incoming Q931 Status Enquiry PDU. If FALSE is returned the connection is aborted and a Release Complete PDU is sent. The default behaviour sends a Q931 Status PDU back. */ virtual BOOL OnReceivedStatusEnquiry( const H323SignalPDU & pdu /// Received Status Enquiry PDU ); /**Handle an incoming Q931 Release Complete PDU. The default behaviour calls Clear() using reason code based on the Release Complete Cause field and the current connection state. */ virtual void OnReceivedReleaseComplete( const H323SignalPDU & pdu /// Received Release Complete PDU ); /**This function is called from the HandleSignallingChannel() function for unhandled PDU types. If FALSE is returned the connection is aborted and a Release Complete PDU is sent. The default behaviour returns TRUE. */ virtual BOOL OnUnknownSignalPDU( const H323SignalPDU & pdu /// Received PDU ); /**Call back for incoming call. This function is called from the OnReceivedSignalSetup() function before it sends the Alerting PDU. It gives an opportunity for an application to alter the reply before transmission to the other endpoint. If FALSE is returned the connection is aborted and a Release Complete PDU is sent. The default behaviour calls the endpoint function of the same name. */ virtual BOOL OnIncomingCall( const H323SignalPDU & setupPDU, /// Received setup PDU H323SignalPDU & alertingPDU /// Alerting PDU to send ); /**Forward incoming call to specified address. This would typically be called from within the OnIncomingCall() function when an application wishes to redirct an unwanted incoming call. The return value is TRUE if the call is to be forwarded, FALSE otherwise. Note that if the call is forwarded the current connection is cleared with the ended call code of EndedByCallForwarded. */ virtual BOOL ForwardCall( const PString & forwardParty /// Party to forward call to. ); /**Initiate the transfer of an existing call (connection) to a new remote party using H.450.2. This sends a Call Transfer Initiate Invoke message from the A-Party (transferring endpoint) to the B-Party (transferred endpoint). */ void TransferCall( const PString & remoteParty, /// Remote party to transfer the existing call to const PString & callIdentity = PString::Empty() /// Call Identity of secondary call if present ); /**Transfer the call through consultation so the remote party in the primary call is connected to the called party in the second call using H.450.2. This sends a Call Transfer Identify Invoke message from the A-Party (transferring endpoint) to the C-Party (transferred-to endpoint). */ void ConsultationTransfer( const PString & primaryCallToken /// Primary call ); /**Handle the reception of a callTransferSetupInvoke APDU whilst a secondary call exists. This method checks whether the secondary call is still waiting for a callTransferSetupInvoke APDU and proceeds to clear the call if the call identies match. This is an internal function and it is not expected the user will call it directly. */ virtual void HandleConsultationTransfer( const PString & callIdentity, /**Call Identity of secondary call received in SETUP Message. */ H323Connection & incoming /// Connection upon which SETUP PDU was received. ); /**Determine whether this connection is being transferred. */ BOOL IsTransferringCall() const; /**Determine whether this connection is the result of a transferred call. */ BOOL IsTransferredCall() const; /**Handle the transfer of an existing connection to a new remote. This is an internal function and it is not expected the user will call it directly. */ virtual void HandleTransferCall( const PString & token, const PString & identity ); /**Get transfer invoke ID dureing trasfer. This is an internal function and it is not expected the user will call it directly. */ int GetCallTransferInvokeId(); /**Handle the failure of a call transfer operation at the Transferred Endpoint. This method is used to handle the following transfer failure cases that can occur at the Transferred Endpoint. The cases are: Reception of an Admission Reject Reception of a callTransferSetup return error APDU. Expiry of Call Transfer timer CT-T4. */ virtual void HandleCallTransferFailure( const int returnError /// Failure reason code ); /**Store the passed token on the current connection's H4502Handler. This is an internal function and it is not expected the user will call it directly. */ void SetAssociatedCallToken( const PString & token /// Associated token ); /**Callback to indicate a successful transfer through consultation. The paramter passed is a reference to the existing connection between the Transferring endpoint and Transferred-to endpoint. */ virtual void OnConsultationTransferSuccess( H323Connection & secondaryCall /// Secondary call for consultation ); /**Place the call on hold, suspending all media channels (H.450.4). Note it is the responsibility of the application layer to delete the MOH Channel if music on hold is provided to the remote endpoint. So far only Local Hold has been implemented. */ void HoldCall( BOOL localHold /// true for Local Hold, false for Remote Hold ); /**Retrieve the call from hold, activating all media channels (H.450.4). This method examines the call hold state and performs the necessary actions required to retrieve a Near-end or Remote-end call on hold. NOTE: Only Local Hold is implemented so far. */ void RetrieveCall(); /**Set the alternative media channel. This channel can be used to provide Media On Hold (MOH) for a near end call hold operation or to provide Recorded Voice Anouncements (RVAs). If this method is not called before a call hold operation is attempted, no media on hold will be provided for the held endpoint. */ void SetHoldMedia( PChannel * audioChannel ); /**Determine if Meadia On Hold is enabled. */ BOOL IsMediaOnHold() const; /**Determine if held. */ BOOL IsLocalHold() const; /**Determine if held. */ BOOL IsRemoteHold() const; /**Determine if the current call is held or in the process of being held. */ BOOL IsCallOnHold() const; /**Begin a call intrusion request. Calls h45011handler->IntrudeCall where SS pdu is added to Call Setup message. */ virtual void IntrudeCall( unsigned capabilityLevel ); /**Handle an incoming call instrusion request. Calls h45011handler->AwaitSetupResponse where we set Handler state to CI-Wait-Ack */ virtual void HandleIntrudeCall( const PString & token, const PString & identity ); /**Set flag indicating call intrusion. Used to set a flag when intrusion occurs and to determine if connection is created for Call Intrusion. This flag is used when we should decide whether to Answer the call or to Close it. */ void SetCallIntrusion() { isCallIntrusion = TRUE; } BOOL IsCallIntrusion() { return isCallIntrusion; } /**Get Call Intrusion Protection Level of the local endpoint. */ unsigned GetLocalCallIntrusionProtectionLevel() { return callIntrusionProtectionLevel; } /**Get Call Intrusion Protection Level of other endpoints that we are in connection with. */ virtual BOOL GetRemoteCallIntrusionProtectionLevel( const PString & callToken, unsigned callIntrusionProtectionLevel ); virtual void SetIntrusionImpending(); virtual void SetForcedReleaseAccepted(); virtual void SetIntrusionNotAuthorized(); /**Send a Call Waiting indication message to the remote endpoint using H.450.6. The second paramter is used to indicate to the calling user how many additional users are "camped on" the called user. A value of zero indicates to the calling user that he/she is the only user attempting to reach the busy called user. */ void SendCallWaitingIndication( const unsigned nbOfAddWaitingCalls = 0 /// number of additional waiting calls at the served user ); enum AnswerCallResponse { AnswerCallNow, /// Answer the call continuing with the connection. AnswerCallDenied, /// Refuse the call sending a release complete. AnswerCallPending, /// Send an Alerting PDU and wait for AnsweringCall() AnswerCallDeferred, /// As for AnswerCallPending but does not send Alerting PDU AnswerCallAlertWithMedia, /// As for AnswerCallPending but starts media channels AnswerCallDeferredWithMedia, /// As for AnswerCallDeferred but starts media channels AnswerCallDeniedByInvalidCID, /// As for AnswerCallDenied but returns e_invalidCID NumAnswerCallResponses }; #if PTRACING friend ostream & operator<<(ostream & o, AnswerCallResponse s); #endif /**Call back for answering an incoming call. This function is used for an application to control the answering of incoming calls. It is usually used to indicate the immediate action to be taken in answering the call. It is called from the OnReceivedSignalSetup() function before it sends the Alerting or Connect PDUs. It also gives an opportunity for an application to alter the Connect PDU reply before transmission to the remote endpoint. If AnswerCallNow is returned then the H.323 protocol proceeds with the connection. If AnswerCallDenied is returned the connection is aborted and a Release Complete PDU is sent. If AnswerCallPending is returned then the Alerting PDU is sent and the protocol negotiations are paused until the AnsweringCall() function is called. Finally, if AnswerCallDeferred is returned then no Alerting PDU is sent, but the system still waits as in the AnswerCallPending response. Note this function should not block for any length of time. If the decision to answer the call may take some time eg waiting for a user to pick up the phone, then AnswerCallPending or AnswerCallDeferred should be returned. The default behaviour calls the endpoint function of the same name which in turn will return AnswerCallNow. */ virtual AnswerCallResponse OnAnswerCall( const PString & callerName, /// Name of caller const H323SignalPDU & setupPDU, /// Received setup PDU H323SignalPDU & connectPDU /// Connect PDU to send. ); /**Indicate the result of answering an incoming call. This should only be called if the OnAnswerCall() callback function has returned a AnswerCallPending or AnswerCallDeferred response. Note sending further AnswerCallPending responses via this function will have the result of an Alerting PDU being sent to the remote endpoint. In this way multiple Alerting PDUs may be sent. Sending a AnswerCallDeferred response would have no effect. */ void AnsweringCall( AnswerCallResponse response /// Answer response to incoming call ); /**Send first PDU in signalling channel. This function does the signalling handshaking for establishing a connection to a remote endpoint. The transport (TCP/IP) for the signalling channel is assumed to be already created. This function will then do the SetRemoteAddress() and Connect() calls o establish the transport. Returns the error code for the call failure reason or NumCallEndReasons if the call was successful to that point in the protocol. */ virtual CallEndReason SendSignalSetup( const PString & alias, /// Name of remote party const H323TransportAddress & address /// Address of destination ); /**Adjust setup PDU being sent on initialisation of signal channel. This function is called from the SendSignalSetup() function before it sends the Setup PDU. It gives an opportunity for an application to alter the request before transmission to the other endpoint. The default behaviour simply returns TRUE. Note that this is usually overridden by the transport dependent descendent class, eg the H323ConnectionTCP descendent fills in the destCallSignalAddress field with the TCP/IP data. Therefore if you override this in your application make sure you call the ancestor function. */ virtual BOOL OnSendSignalSetup( H323SignalPDU & setupPDU /// Setup PDU to send ); /**Adjust call proceeding PDU being sent. This function is called from the OnReceivedSignalSetup() function before it sends the Call Proceeding PDU. It gives an opportunity for an application to alter the request before transmission to the other endpoint. If this function returns FALSE then the Call Proceeding PDU is not sent at all. The default behaviour simply returns TRUE. */ virtual BOOL OnSendCallProceeding( H323SignalPDU & callProceedingPDU /// Call Proceeding PDU to send ); /**Call back for Release Complete being sent. This allows an application to add things to the release complete before it is sent to the remote endpoint. Returning FALSE will prevent the release complete from being sent. Note that this would be very unusual as this is called when the connection is being cleaned up. There will be no second chance to send the PDU and it must be sent. The default behaviour simply returns TRUE. */ virtual BOOL OnSendReleaseComplete( H323SignalPDU & releaseCompletePDU /// Release Complete PDU to send ); /**Call back for remote party being alerted. This function is called from the SendSignalSetup() function after it receives the optional Alerting PDU from the remote endpoint. That is when the remote "phone" is "ringing". If FALSE is returned the connection is aborted and a Release Complete PDU is sent. The default behaviour calls the endpoint function of the same name. */ virtual BOOL OnAlerting( const H323SignalPDU & alertingPDU, /// Received Alerting PDU const PString & user /// Username of remote endpoint ); /**This function is called when insufficient digits have been entered. This supports overlapped dialling so that a call can begin when it is not known how many more digits are to be entered in a phone number. It is expected that the application will override this function. It should be noted that the application should not block in the function but only indicate to whatever other thread is gathering digits that more are required and that thread should call SendMoreDigits(). If FALSE is returned the connection is aborted and a Release Complete PDU is sent. The default behaviour simply returns FALSE. */ virtual BOOL OnInsufficientDigits(); /**This function is called when sufficient digits have been entered. This supports overlapped dialling so that a call can begin when it is not known how many more digits are to be entered in a phone number. The digits parameter is appended to the existing remoteNumber member variable and the call is retried. If FALSE is returned the connection is aborted and a Release Complete PDU is sent. The default behaviour simply returns TRUE. */ virtual void SendMoreDigits( const PString & digits /// Extra digits ); /**This function is called from the SendSignalSetup() function after it receives the Connect PDU from the remote endpoint, but before it attempts to open the control channel. If FALSE is returned the connection is aborted and a Release Complete PDU is sent. The default behaviour calls H323EndPoint::OnOutgoingCall */ virtual BOOL OnOutgoingCall( const H323SignalPDU & connectPDU /// Received Connect PDU ); /**Send an the acknowldege of a fast start. This function is called when the fast start channels provided to this connection by the original SETUP PDU have been selected and opened and need to be sent back to the remote endpoint. If FALSE is returned then no fast start has been acknowledged, possibly due to no common codec in fast start request. The default behaviour uses OnSelectLogicalChannels() to find a pair of channels and adds then to the provided PDU. */ virtual BOOL SendFastStartAcknowledge( H225_ArrayOf_PASN_OctetString & array /// Array of H245_OpenLogicalChannel ); /**Handle the acknowldege of a fast start. This function is called from one of a number of functions after it receives a PDU from the remote endpoint that has a fastStart field. It is in response to a request for a fast strart from the local endpoint. If FALSE is returned the connection is aborted and a Release Complete PDU is sent. The default behaviour parses the provided array and starts the channels acknowledged in it. */ virtual BOOL HandleFastStartAcknowledge( const H225_ArrayOf_PASN_OctetString & array /// Array of H245_OpenLogicalChannel ); /**Start a separate H245 channel. This function is called from one of a number of functions when it needs to create the h245 channel for the remote endpoint to connect back to. If FALSE is returned the connection is aborted and a Release Complete PDU is sent. */ virtual BOOL StartControlChannel(); /**Start a separate H245 channel. This function is called from one of a number of functions after it receives a PDU from the remote endpoint that has a h245Address field. If FALSE is returned the connection is aborted and a Release Complete PDU is sent. The default behaviour checks to see if it is a known transport and creates a corresponding H323Transport decendent for the control channel. */ virtual BOOL StartControlChannel( const H225_TransportAddress & h245Address /// H245 address ); //@} /**@name Control Channel */ //@{ /**Write a PDU to the control channel. If there is no control channel open then this will tunnel the PDU into the signalling channel. */ BOOL WriteControlPDU( const H323ControlPDU & pdu ); /**Start control channel negotiations. */ virtual BOOL StartControlNegotiations(); /**Handle reading data on the control channel. */ virtual void HandleControlChannel(); /**Handle incoming data on the control channel. This decodes the data stream into a PDU and calls HandleControlPDU(). If FALSE is returned the connection is aborted. The default behaviour returns TRUE. */ virtual BOOL HandleControlData( PPER_Stream & strm ); /**Handle incoming PDU's on the control channel. Dispatches them to the various virtuals off this class. If FALSE is returned the connection is aborted. The default behaviour returns TRUE. */ virtual BOOL HandleControlPDU( const H323ControlPDU & pdu ); /**This function is called from the HandleControlPDU() function for unhandled PDU types. If FALSE is returned the connection is aborted and a Release Complete PDU is sent. The default behaviour returns TRUE. The default behaviour send a FunctioNotUnderstood indication back to the sender, and returns TRUE to continue operation. */ virtual BOOL OnUnknownControlPDU( const H323ControlPDU & pdu /// Received PDU ); /**Handle incoming request PDU's on the control channel. Dispatches them to the various virtuals off this class. */ virtual BOOL OnH245Request( const H323ControlPDU & pdu /// Received PDU ); /**Handle incoming response PDU's on the control channel. Dispatches them to the various virtuals off this class. */ virtual BOOL OnH245Response( const H323ControlPDU & pdu /// Received PDU ); /**Handle incoming command PDU's on the control channel. Dispatches them to the various virtuals off this class. */ virtual BOOL OnH245Command( const H323ControlPDU & pdu /// Received PDU ); /**Handle incoming indication PDU's on the control channel. Dispatches them to the various virtuals off this class. */ virtual BOOL OnH245Indication( const H323ControlPDU & pdu /// Received PDU ); /**Handle H245 command to send terminal capability set. */ virtual BOOL OnH245_SendTerminalCapabilitySet( const H245_SendTerminalCapabilitySet & pdu /// Received PDU ); /**Handle H245 command to control flow control. This function calls OnLogicalChannelFlowControl() with the channel and bit rate restriction. */ virtual BOOL OnH245_FlowControlCommand( const H245_FlowControlCommand & pdu /// Received PDU ); /**Handle H245 miscellaneous command. This function passes the miscellaneous command on to the channel defined by the pdu. */ virtual BOOL OnH245_MiscellaneousCommand( const H245_MiscellaneousCommand & pdu /// Received PDU ); /**Handle H245 miscellaneous indication. This function passes the miscellaneous indication on to the channel defined by the pdu. */ virtual BOOL OnH245_MiscellaneousIndication( const H245_MiscellaneousIndication & pdu /// Received PDU ); /**Handle H245 indication of received jitter. This function calls OnLogicalChannelJitter() with the channel and estimated jitter. */ virtual BOOL OnH245_JitterIndication( const H245_JitterIndication & pdu /// Received PDU ); /**Error discriminator for the OnControlProtocolError() function. */ enum ControlProtocolErrors { e_MasterSlaveDetermination, e_CapabilityExchange, e_LogicalChannel, e_ModeRequest, e_RoundTripDelay }; /**This function is called from the HandleControlPDU() function or any of its sub-functions for protocol errors, eg unhandled PDU types. The errorData field may be a string or PDU or some other data depending on the value of the errorSource parameter. These are: e_UnhandledPDU &H323ControlPDU e_MasterSlaveDetermination const char * If FALSE is returned the connection is aborted. The default behaviour returns TRUE. */ virtual BOOL OnControlProtocolError( ControlProtocolErrors errorSource, // Source of the proptoerror const void * errorData = NULL // Data associated with error ); /**This function is called from the HandleControlPDU() function when it is about to send the Capabilities Set to the remote endpoint. This gives the application an oppurtunity to alter the PDU to be sent. The default behaviour will make "adjustments" for compatibility with some broken remote endpoints. */ virtual void OnSendCapabilitySet( H245_TerminalCapabilitySet & pdu /// PDU to send ); /**This function is called when the remote endpoint sends its capability set. This gives the application an opportunity to determine what codecs are available and if it supports any of the combinations of codecs. Note any codec types that are the remote system supports that are not in the codecs list member variable for the endpoint are ignored and not included in the remoteCodecs list. The default behaviour assigns the table and set to member variables and returns TRUE if the remoteCodecs list is not empty. */ virtual BOOL OnReceivedCapabilitySet( const H323Capabilities & remoteCaps, /// Capability combinations remote supports const H245_MultiplexCapability * muxCap, /// Transport capability, if present H245_TerminalCapabilitySetReject & reject /// Rejection PDU (if return FALSE) ); /**Send a new capability set. */ virtual void SendCapabilitySet( BOOL empty /// Send an empty set. ); /**Call back to set the local capabilities. This is called just before the capabilties are required when a call is begun. It is called when a SETUP PDU is received or when one is about to be sent, so that the capabilities may be adjusted for correct fast start operation. The default behaviour does nothing. */ virtual void OnSetLocalCapabilities(); /**Return if this H245 connection is a master or slave */ BOOL IsH245Master() const; /**Start the round trip delay calculation over the control channel. */ void StartRoundTripDelay(); /**Get the round trip delay over the control channel. */ PTimeInterval GetRoundTripDelay() const; //@} /**@name Logical Channel Management */ //@{ /**Call back to select logical channels to start. This function must be defined by the descendent class. It is used to select the logical channels to be opened between the two endpoints. There are three ways in which this may be called: when a "fast start" has been initiated by the local endpoint (via SendSignalSetup() function), when a "fast start" has been requested from the remote endpoint (via the OnReceivedSignalSetup() function) or when the H245 capability set (and master/slave) negotiations have completed (via the OnControlChannelOpen() function. The function would typically examine several member variable to decide which mode it is being called in and what to do. If fastStartState is FastStartDisabled then non-fast start semantics should be used. The H245 capabilities in the remoteCapabilities members should be examined, and appropriate transmit channels started using OpenLogicalChannel(). If fastStartState is FastStartInitiate, then the local endpoint has initiated a call and is asking the application if fast start semantics are to be used. If so it is expected that the function call OpenLogicalChannel() for all the channels that it wishes to be able to be use. A subset (possibly none!) of these would actually be started when the remote endpoint replies. If fastStartState is FastStartResponse, then this indicates the remote endpoint is attempting a fast start. The fastStartChannels member contains a list of possible channels from the remote that the local endpoint is to select which to accept. For each accepted channel it simply necessary to call the Start() function on that channel eg fastStartChannels[0].Start(); The default behaviour selects the first codec of each session number that is available. This is according to the order of the capabilities in the remoteCapabilities, the local capability table or of the fastStartChannels list respectively for each of the above scenarios. */ virtual void OnSelectLogicalChannels(); /**Select default logical channel for normal start. */ virtual void SelectDefaultLogicalChannel( unsigned sessionID /// Session ID to find default logical channel. ); /**Select default logical channel for fast start. Internal function, not for normal use. */ virtual void SelectFastStartChannels( unsigned sessionID, /// Session ID to find default logical channel. BOOL transmitter, /// Whether to open transmitters BOOL receiver /// Whether to open receivers ); /**Open a new logical channel. This function will open a channel between the endpoints for the specified capability. If this function is called while there is not yet a conenction established, eg from the OnFastStartLogicalChannels() function, then a "trial" receiver/transmitter channel is created. This channel is not started until the remote enpoint has confirmed that they are to start. Any channels not confirmed are deleted. If this function is called later in the call sequence, eg from OnSelectLogicalChannels(), then it may only establish a transmit channel, ie fromRemote must be FALSE. */ virtual BOOL OpenLogicalChannel( const H323Capability & capability, /// Capability to open channel with unsigned sessionID, /// Session for the channel H323Channel::Directions dir /// Direction of channel ); /**This function is called when the remote endpoint want's to open a new channel. If the return value is FALSE then the open is rejected using the errorCode as the cause, this would be a value from the enum H245_OpenLogicalChannelReject_cause::Choices. The default behaviour simply returns TRUE. */ virtual BOOL OnOpenLogicalChannel( const H245_OpenLogicalChannel & openPDU, /// Received PDU for the channel open H245_OpenLogicalChannelAck & ackPDU, /// PDU to send for acknowledgement unsigned & errorCode /// Error to return if refused ); /**Callback for when a logical channel conflict has occurred. This is called when the remote endpoint, which is a master, rejects our transmitter channel due to a resource conflict. Typically an inability to do asymmetric codecs. The local (slave) endpoint must then try and open a new transmitter channel using the same codec as the receiver that is being opened. */ virtual BOOL OnConflictingLogicalChannel( H323Channel & channel /// Channel that conflicted ); /**Create a new logical channel object. This is in response to a request from the remote endpoint to open a logical channel. */ virtual H323Channel * CreateLogicalChannel( const H245_OpenLogicalChannel & open, /// Parameters for opening channel BOOL startingFast, /// Flag for fast/slow starting. unsigned & errorCode /// Reason for create failure ); /**Create a new real time logical channel object. This creates a logical channel for handling RTP data. It is primarily used to allow an application to redirect the RTP media streams to other hosts to the local one. In that case it would create an instance of the H323_ExternalRTPChannel class with the appropriate address. eg: H323Channel * MyConnection::CreateRealTimeLogicalChannel( const H323Capability & capability, H323Channel::Directions dir, unsigned sessionID, const H245_H2250LogicalChannelParameters * param, RTP_QOS * rtpqos) { return new H323_ExternalRTPChannel(*this, capability, dir, sessionID, externalIpAddress, externalPort); } An application would typically also override the OnStartLogicalChannel() function to obtain from the H323_ExternalRTPChannel instance the address of the remote endpoints media server RTP addresses to complete the setting up of the external RTP stack. eg: BOOL OnStartLogicalChannel(H323Channel & channel) { H323_ExternalRTPChannel & external = (H323_ExternalRTPChannel &)channel; external.GetRemoteAddress(remoteIpAddress, remotePort); } Note that the port in the above example is always the data port, the control port is assumed to be data+1. The default behaviour assures there is an RTP session for the session ID, and if not creates one, then creates a H323_RTPChannel which will do RTP media to the local host. */ virtual H323Channel * CreateRealTimeLogicalChannel( const H323Capability & capability, /// Capability creating channel H323Channel::Directions dir, /// Direction of channel unsigned sessionID, /// Session ID for RTP channel const H245_H2250LogicalChannelParameters * param, /// Parameters for channel RTP_QOS * rtpqos = NULL /// QoS for RTP ); /**This function is called when the remote endpoint want's to create a new channel. If the return value is FALSE then the open is rejected using the errorCode as the cause, this would be a value from the enum H245_OpenLogicalChannelReject_cause::Choices. The default behaviour checks the capability set for if this capability is allowed to be opened with other channels that may already be open. */ virtual BOOL OnCreateLogicalChannel( const H323Capability & capability, /// Capability for the channel open H323Channel::Directions dir, /// Direction of channel unsigned & errorCode /// Error to return if refused ); /**Call back function when a logical channel thread begins. The default behaviour does nothing and returns TRUE. */ virtual BOOL OnStartLogicalChannel( H323Channel & channel /// Channel that has been started. ); /**Open a channel for use by an audio codec. The H323AudioCodec class will use this function to open the channel to read/write PCM data. The default behaviour calls the equivalent function on the endpoint. */ virtual BOOL OpenAudioChannel( BOOL isEncoding, /// Direction of data flow unsigned bufferSize, /// Size of each sound buffer H323AudioCodec & codec /// codec that is doing the opening ); #ifndef NO_H323_VIDEO /**Open a channel for use by an video codec. The H323VideoCodec class will use this function to open the channel to read/write image data. The default behaviour calls the equivalent function on the endpoint. */ virtual BOOL OpenVideoChannel( BOOL isEncoding, /// Direction of data flow H323VideoCodec & codec /// codec doing the opening ); #endif // NO_H323_VIDEO /**Close a logical channel. */ virtual void CloseLogicalChannel( unsigned number, /// Channel number to close. BOOL fromRemote /// Indicates close request of remote channel ); /**Close a logical channel by number. */ virtual void CloseLogicalChannelNumber( const H323ChannelNumber & number /// Channel number to close. ); /**Close a logical channel. */ virtual void CloseAllLogicalChannels( BOOL fromRemote /// Indicates close request of remote channel ); /**This function is called when the remote endpoint has closed down a logical channel. The default behaviour does nothing. */ virtual void OnClosedLogicalChannel( const H323Channel & channel /// Channel that was closed ); /**This function is called when the remote endpoint request the close of a logical channel. The application may get an opportunity to refuse to close the channel by returning FALSE from this function. The default behaviour returns TRUE. */ virtual BOOL OnClosingLogicalChannel( H323Channel & channel /// Channel that is to be closed ); /**This function is called when the remote endpoint wishes to limit the bit rate being sent on a channel. If channel is NULL, then the bit rate limit applies to all channels. The default behaviour does nothing if channel is NULL, otherwise calls H323Channel::OnFlowControl() on the specific channel. */ virtual void OnLogicalChannelFlowControl( H323Channel * channel, /// Channel that is to be limited long bitRateRestriction /// Limit for channel ); /**This function is called when the remote endpoint indicates the level of jitter estimated by the receiver. If channel is NULL, then the jitter applies to all channels. The default behaviour does nothing if channel is NULL, otherwise calls H323Channel::OnJitter() on the specific channel. */ virtual void OnLogicalChannelJitter( H323Channel * channel, /// Channel that is to be limited DWORD jitter, /// Estimated received jitter in microseconds int skippedFrameCount, /// Frames skipped by decodec int additionalBuffer /// Additional size of video decoder buffer ); /**Send a miscellaneous command on the associated H245 channel. */ void SendLogicalChannelMiscCommand( H323Channel & channel, /// Channel to send command for unsigned command /// Command code to send ); /**Get a logical channel. Locates the specified channel number and returns a pointer to it. */ H323Channel * GetLogicalChannel( unsigned number, /// Channel number to get. BOOL fromRemote /// Indicates get a remote channel ) const; /**Find a logical channel. Locates a channel give a RTP session ID. Each session would usually have two logical channels associated with it, so the fromRemote flag bay be used to distinguish which channel to return. */ H323Channel * FindChannel( unsigned sessionId, /// Session ID to search for. BOOL fromRemote /// Indicates the direction of RTP data. ) const; //@} /**@name Bandwidth Management */ //@{ /**Get the bandwidth currently used. This totals the open channels and returns the total bandwidth used in 100's of bits/sec */ unsigned GetBandwidthUsed() const; /**Request use the available bandwidth in 100's of bits/sec. If there is insufficient bandwidth available, FALSE is returned. If sufficient bandwidth is available, then TRUE is returned and the amount of available bandwidth is reduced by the specified amount. */ BOOL UseBandwidth( unsigned bandwidth, /// Bandwidth required BOOL removing /// Flag for adding/removing bandwidth usage ); /**Get the available bandwidth in 100's of bits/sec. */ unsigned GetBandwidthAvailable() const { return bandwidthAvailable; } /**Set the available bandwidth in 100's of bits/sec. Note if the force parameter is TRUE this function will close down active logical channels to meet the new bandwidth requirement. */ BOOL SetBandwidthAvailable( unsigned newBandwidth, /// New bandwidth limit BOOL force = FALSE /// Force bandwidth limit ); //@} /**@name Indications */ //@{ enum SendUserInputModes { SendUserInputAsQ931, SendUserInputAsString, SendUserInputAsTone, SendUserInputAsInlineRFC2833, SendUserInputAsSeparateRFC2833, // Not implemented NumSendUserInputModes }; #if PTRACING friend ostream & operator<<(ostream & o, SendUserInputModes m); #endif /**Set the user input indication transmission mode. */ void SetSendUserInputMode(SendUserInputModes mode); /**Get the user input indication transmission mode. */ SendUserInputModes GetSendUserInputMode() const { return sendUserInputMode; } /**Get the real user input indication transmission mode. This will return the user input mode that will actually be used for transmissions. It will be the value of GetSendUserInputMode() provided the remote endpoint is capable of that mode. */ SendUserInputModes GetRealSendUserInputMode() const; /**Send a user input indication to the remote endpoint. This is for sending arbitrary strings as user indications. The user indication is sent according to the sendUserInputMode member variable. If SendUserInputAsString then this uses an H.245 "string" UserInputIndication pdu sending the entire string in one go. If SendUserInputAsTone then a separate H.245 "signal" UserInputIndication pdu is sent for each character. If SendUserInputAsInlineRFC2833 then the indication is inserted into the outgoing audio stream as an RFC2833 RTP data pdu. SendUserInputAsSeparateRFC2833 is not yet supported. */ virtual void SendUserInput( const PString & value /// String value of indication ); /**Call back for remote endpoint has sent user input. This will be called irrespective of the source (H.245 string, H.245 signal or RFC2833). The default behaviour calls the endpoint function of the same name. */ virtual void OnUserInputString( const PString & value /// String value of indication ); /**Send a user input indication to the remote endpoint. This sends DTMF emulation user input. If something more sophisticated than the simple tones that can be sent using the SendUserInput() function. A duration of zero indicates that no duration is to be indicated. A non-zero logical channel indicates that the tone is to be syncronised with the logical channel at the rtpTimestamp value specified. The tone parameter must be one of "0123456789#*ABCD!" where '!' indicates a hook flash. If tone is a ' ' character then a signalUpdate PDU is sent that updates the last tone indication sent. See the H.245 specifcation for more details on this. The user indication is sent according to the sendUserInputMode member variable. If SendUserInputAsString then this uses an H.245 "string" UserInputIndication pdu sending the entire string in one go. If SendUserInputAsTone then a separate H.245 "signal" UserInputIndication pdu is sent for each character. If SendUserInputAsInlineRFC2833 then the indication is inserted into the outgoing audio stream as an RFC2833 RTP data pdu. SendUserInputAsSeparateRFC2833 is not yet supported. */ virtual void SendUserInputTone( char tone, /// DTMF tone code unsigned duration = 0, /// Duration of tone in milliseconds unsigned logicalChannel = 0, /// Logical channel number for RTP sync. unsigned rtpTimestamp = 0 /// RTP timestamp in logical channel sync. ); /**Call back for remote enpoint has sent user input. The default behaviour calls the endpoint function of the same name. */ virtual void OnUserInputTone( char tone, /// DTMF tone code unsigned duration, /// Duration of tone in milliseconds unsigned logicalChannel, /// Logical channel number for RTP sync. unsigned rtpTimestamp /// RTP timestamp in logical channel sync. ); /**Send a user input indication to the remote endpoint. This sends a Hook Flash emulation user input. */ void SendUserInputHookFlash( int duration = 500 /// Duration of tone in milliseconds ) { SendUserInputTone('!', duration); } /**Send a user input indication to the remote endpoint. This is for sending arbitrary strings as user indications. This always uses a Q.931 Keypad Information Element in a Information pdu sending the entire string in one go. */ virtual void SendUserInputIndicationQ931( const PString & value /// String value of indication ); /**Send a user input indication to the remote endpoint. This is for sending arbitrary strings as user indications. This always uses an H.245 "string" UserInputIndication pdu sending the entire string in one go. */ virtual void SendUserInputIndicationString( const PString & value /// String value of indication ); /**Send a user input indication to the remote endpoint. This sends DTMF emulation user input.This uses an H.245 "signal" UserInputIndication pdu. */ virtual void SendUserInputIndicationTone( char tone, /// DTMF tone code unsigned duration = 0, /// Duration of tone in milliseconds unsigned logicalChannel = 0, /// Logical channel number for RTP sync. unsigned rtpTimestamp = 0 /// RTP timestamp in logical channel sync. ); /**Send a user input indication to the remote endpoint. The two forms are for basic user input of a simple string using the SendUserInput() function or a full DTMF emulation user input using the SendUserInputTone() function. An application could do more sophisticated usage by filling in the H245_UserInputIndication structure directly ans using this function. */ virtual void SendUserInputIndication( const H245_UserInputIndication & pdu /// Full user indication PDU ); /**Call back for remote enpoint has sent user input. The default behaviour calls OnUserInputString() if the PDU is of the alphanumeric type, or OnUserInputTone() if of a tone type. */ virtual void OnUserInputIndication( const H245_UserInputIndication & pdu /// Full user indication PDU ); //@} /**@name RTP Session Management */ //@{ /**Get an RTP session for the specified ID. If there is no session of the specified ID, NULL is returned. */ virtual RTP_Session * GetSession( unsigned sessionID ) const; /**Get an H323 RTP session for the specified ID. If there is no session of the specified ID, NULL is returned. */ virtual H323_RTP_Session * GetSessionCallbacks( unsigned sessionID ) const; /**Use an RTP session for the specified ID and for the given direction. If there is no session of the specified ID, a new one is created using the information provided in the H245_TransportAddress PDU. If the system does not support the specified transport, NULL is returned. If this function is used, then the ReleaseSession() function MUST be called or the session is never deleted for the lifetime of the H323 connection. */ virtual RTP_Session * UseSession( unsigned sessionID, const H245_TransportAddress & pdu, H323Channel::Directions dir, RTP_QOS * rtpqos = NULL ); /**Release the session. If the session ID is not being used any more any clients via the UseSession() function, then the session is deleted. */ virtual void ReleaseSession( unsigned sessionID ); /**Callback from the RTP session for statistics monitoring. This is called every so many packets on the transmitter and receiver threads of the RTP session indicating that the statistics have been updated. The default behaviour calls H323EndPoint::OnRTPStatistics(). */ virtual void OnRTPStatistics( const RTP_Session & session /// Session with statistics ) const; /**Get the names of the codecs in use for the RTP session. If there is no session of the specified ID, an empty string is returned. */ virtual PString GetSessionCodecNames( unsigned sessionID ) const; /** Return TRUE if the remote appears to be behind a NAT firewall */ BOOL IsBehindNAT() const { return remoteIsNAT; } //@} /**@name Request Mode Changes */ //@{ /**Make a request to mode change to remote. This asks the remote system to stop it transmitters and start sending one of the combinations specifed. The modes are separated in the string by \n characters, and all of the channels (capabilities) are strings separated by \t characters. Thus a very simple mode change would be "T.38" which requests that the remote start sending T.38 data and nothing else. A more complicated example would be "G.723\tH.261\nG.729\tH.261\nG.728" which indicates that the remote should either start sending G.723 and H.261, G.729 and H.261 or just G.728 on its own. Returns FALSE if a mode change is currently in progress, only one mode change may be done at a time. */ virtual BOOL RequestModeChange( const PString & newModes /// New modes to select ); /**Make a request to mode change to remote. This asks the remote system to stop it transmitters and start sending one of the combinations specifed. Returns FALSE if a mode change is currently in progress, only one mode change may be done at a time. */ virtual BOOL RequestModeChange( const H245_ArrayOf_ModeDescription & newModes /// New modes to select ); /**Received request for mode change from remote. */ virtual BOOL OnRequestModeChange( const H245_RequestMode & pdu, /// Received PDU H245_RequestModeAck & ack, /// Ack PDU to send H245_RequestModeReject & reject, /// Reject PDU to send PINDEX & selectedMode /// Which mode was selected ); /**Completed request for mode change from remote. This is a call back that accurs after the ack has been sent to the remote as indicated by the OnRequestModeChange() return result. This function is intended to actually implement the mode change after it had been accepted. */ virtual void OnModeChanged( const H245_ModeDescription & newMode ); /**Received acceptance of last mode change request. This callback indicates that the RequestModeChange() was accepted by the remote endpoint. */ virtual void OnAcceptModeChange( const H245_RequestModeAck & pdu /// Received PDU ); /**Received reject of last mode change request. This callback indicates that the RequestModeChange() was accepted by the remote endpoint. */ virtual void OnRefusedModeChange( const H245_RequestModeReject * pdu /// Received PDU, if NULL is a timeout ); //@} /**@name Other services */ //@{ /**Create an instance of the T.120 protocol handler. This is called when the OpenLogicalChannel subsystem requires that a T.120 channel be established. Note that if the application overrides this and returns a pointer to a heap variable (using new) then it is the responsibility of the creator to subsequently delete the object. The user of this function (the H323_T120Channel class) will not do so. The default behavour returns H323Endpoint::CreateT120ProtocolHandler() while keeping track of that variable for autmatic deletion. */ virtual OpalT120Protocol * CreateT120ProtocolHandler(); /**Create an instance of the T.38 protocol handler. This is called when the OpenLogicalChannel subsystem requires that a T.38 fax channel be established. Note that if the application overrides this and returns a pointer to a heap variable (using new) then it is the responsibility of the creator to subsequently delete the object. The user of this function (the H323_T38Channel class) will not do so. The default behavour returns H323Endpoint::CreateT38ProtocolHandler() while keeping track of that variable for autmatic deletion. */ virtual OpalT38Protocol * CreateT38ProtocolHandler(); /**Request a mode change to T.38 data. */ virtual BOOL RequestModeChangeT38( const char * capabilityNames = "T.38\nT38FaxUDP" ); /**Get separate H.235 authentication for the connection. This allows an individual ARQ to override the authentical credentials used in H.235 based RAS for this particular connection. A return value of FALSE indicates to use the default credentials of the endpoint, while TRUE indicates that new credentials are to be used. The default behavour does nothing and returns FALSE. */ virtual BOOL GetAdmissionRequestAuthentication( const H225_AdmissionRequest & arq, /// ARQ being constructed H235Authenticators & authenticators /// New authenticators for ARQ ); //@} /**@name Member variable access */ //@{ /**Get the owner endpoint for this connection. */ H323EndPoint & GetEndPoint() const { return endpoint; } /**Get the call direction for this connection. */ BOOL HadAnsweredCall() const { return callAnswered; } /**Determined if connection is gatekeeper routed. */ BOOL IsGatekeeperRouted() const { return gatekeeperRouted; } /**Get the Q.931 cause code (Q.850) that terminated this call. See Q931::CauseValues for common values. */ unsigned GetQ931Cause() const { return q931Cause; } /**Get the distinctive ring code for incoming call. This returns an integer from 0 to 7 that may indicate to an application that different ring cadences are to be used. */ unsigned GetDistinctiveRing() const { return distinctiveRing; } /**Set the distinctive ring code for outgoing call. This sets the integer from 0 to 7 that will be used in the outgoing Setup PDU. Note this must be called either immediately after construction or during the OnSendSignalSetup() callback function so the member variable is set befor ethe PDU is sent. */ void SetDistinctiveRing(unsigned pattern) { distinctiveRing = pattern&7; } /**Get the internal OpenH323 call token for this connection. */ const PString & GetCallToken() const { return callToken; } /**Get the call reference for this connection. */ unsigned GetCallReference() const { return callReference; } /**Get the call identifier for this connection. */ const OpalGloballyUniqueID & GetCallIdentifier() const { return callIdentifier; } /**Get the conference identifier for this connection. */ const OpalGloballyUniqueID & GetConferenceIdentifier() const { return conferenceIdentifier; } /**Get the local name/alias. */ const PString & GetLocalPartyName() const { return localPartyName; } /**Set the local name/alias from information in the PDU. */ void SetLocalPartyName(const PString & name); /**Set the local Q.931 display name */ void SetDisplayName(const PString & name) { localDisplayName = name; } /**Get the local Q.931 display name */ const PString GetDisplayName() const { return localDisplayName; } const PStringList & GetLocalAliasNames() const { return localAliasNames; } /**Get the remote party name. This returns a string indicating the remote parties names and aliases. This can be a complicated string containing all the aliases and the remote host name. For example: "Fred Nurk (fred, 5551234) [fred.nurk.com]" */ const PString & GetRemotePartyName() const { return remotePartyName; } /**Get the remote party number, if there was one one. If the remote party has indicated an e164 number as one of its aliases or as a field in the Q.931 PDU, then this function will return it. */ const PString & GetRemotePartyNumber() const { return remotePartyNumber; } /**Get the remote party address. This will return the "best guess" at an address to use in a H323EndPoint::MakeCall() function to call the remote party back again. Note that due to the presence of gatekeepers/proxies etc this may not always be accurate. */ const PString & GetRemotePartyAddress() const { return remotePartyAddress; } /**Set the name/alias of remote end from information in the PDU. */ void SetRemotePartyInfo( const H323SignalPDU & pdu /// PDU from which to extract party info. ); /**Get the remote application name and version. This information is obtained from the sourceInfo field of the H.225 Setup PDU or the destinationInfo of the call proceeding or alerting PDU's. The general format of the string will be information extracted from the VendorIdentifier field of the EndpointType. In particular: productId versionId t35CountryCode/manufacturerCode for example "Equivalence OpenPhone\t1.4.2\t9/61" */ const PString & GetRemoteApplication() const { return remoteApplication; } /**Set the name/alias of remote end from information in the PDU. */ void SetRemoteApplication( const H225_EndpointType & pdu /// PDU from which to extract application info. ); /**Get the remotes capability table for this connection. */ const H323Capabilities & GetLocalCapabilities() const { return localCapabilities; } /**Get the remotes capability table for this connection. */ const H323Capabilities & GetRemoteCapabilities() const { return remoteCapabilities; } /**Get the maximum audio jitter delay. */ unsigned GetRemoteMaxAudioDelayJitter() const { return remoteMaxAudioDelayJitter; } /**Get the signalling channel being used. */ const H323Transport * GetSignallingChannel() const { return signallingChannel; } /**Get the signalling channel protocol version number. */ unsigned GetSignallingVersion() const { return h225version; } /**Get the control channel being used (may return signalling channel). */ const H323Transport & GetControlChannel() const; /**Get the control channel protocol version number. */ unsigned GetControlVersion() const { return h245version; } /**Get the time at which the connection was begun */ PTime GetSetupUpTime() const { return setupTime; } /**Get the time at which the ALERTING was received */ PTime GetAlertingTime() const { return alertingTime; } /**Get the time at which the connection was connected. That is the point at which charging is likely to have begun. */ PTime GetConnectionStartTime() const { return connectedTime; } /**Get the time at which the connection was cleared */ PTime GetConnectionEndTime() const { return callEndTime; } /**Get the default maximum audio jitter delay parameter. Defaults to 50ms */ unsigned GetMinAudioJitterDelay() const { return minAudioJitterDelay; } /**Get the default maximum audio delay jitter parameter. Defaults to 250ms. */ unsigned GetMaxAudioJitterDelay() const { return maxAudioJitterDelay; } /**Set the maximum audio delay jitter parameter. */ void SetAudioJitterDelay( unsigned minDelay, // New minimum jitter buffer delay in milliseconds unsigned maxDelay // New maximum jitter buffer delay in milliseconds ); /**Get the UUIE PDU monitor bit mask. */ unsigned GetUUIEsRequested() const { return uuiesRequested; } /**Set the UUIE PDU monitor bit mask. */ void SetUUIEsRequested(unsigned mask) { uuiesRequested = mask; } /**Get the iNow Gatekeeper Access Token OID. */ const PString GetGkAccessTokenOID() const { return gkAccessTokenOID; } /**Set the iNow Gatekeeper Access Token OID. */ void SetGkAccessTokenOID(const PString & oid) { gkAccessTokenOID = oid; } /**Get the iNow Gatekeeper Access Token data. */ const PBYTEArray & GetGkAccessTokenData() const { return gkAccessTokenData; } /**Set the Destionation Extra Call Info memeber. */ void SetDestExtraCallInfo( const PString & info ) { destExtraCallInfo = info; } /** Set the remote call waiting flag */ void SetRemotCallWaiting(const unsigned value) { remoteCallWaiting = value; } /**How many caller's are waiting on the remote endpoint? -1 - None 0 - Just this connection n - n plus this connection */ const int GetRemoteCallWaiting() const { return remoteCallWaiting; } /**Set the enforced duration limit for the call. This starts a timer that will automatically shut down the call when it expires. */ void SetEnforcedDurationLimit( unsigned seconds /// max duration of call in seconds ); //@} virtual BOOL OnSendFeatureSet(unsigned, H225_FeatureSet &) const; virtual void OnReceiveFeatureSet(unsigned, const H225_FeatureSet &) const; protected: /**Internal function to check if call established. This checks all the criteria for establishing a call an initiating the starting of media channels, if they have not already been started via the fast start algorithm. */ virtual void InternalEstablishedConnectionCheck(); BOOL InternalEndSessionCheck(PPER_Stream & strm); void SetRemoteVersions(const H225_ProtocolIdentifier & id); void MonitorCallStatus(); PDECLARE_NOTIFIER(OpalRFC2833Info, H323Connection, OnUserInputInlineRFC2833); PDECLARE_NOTIFIER(H323Codec::FilterInfo, H323Connection, OnUserInputInBandDTMF); H323EndPoint & endpoint; PSyncPoint * endSync; int remoteCallWaiting; // Number of call's waiting at the remote endpoint BOOL callAnswered; BOOL gatekeeperRouted; unsigned distinctiveRing; PString callToken; unsigned callReference; OpalGloballyUniqueID callIdentifier; OpalGloballyUniqueID conferenceIdentifier; PStringList localAliasNames; PString localPartyName; PString localDisplayName; H323Capabilities localCapabilities; // Capabilities local system supports PString remotePartyName; PString remotePartyNumber; PString remotePartyAddress; PString destExtraCallInfo; PString remoteApplication; H323Capabilities remoteCapabilities; // Capabilities remote system supports unsigned remoteMaxAudioDelayJitter; PTimer roundTripDelayTimer; unsigned minAudioJitterDelay; unsigned maxAudioJitterDelay; unsigned bandwidthAvailable; unsigned uuiesRequested; PString gkAccessTokenOID; PBYTEArray gkAccessTokenData; BOOL addAccessTokenToSetup; SendUserInputModes sendUserInputMode; H323Transport * signallingChannel; H323Transport * controlChannel; BOOL h245Tunneling; H323SignalPDU * h245TunnelRxPDU; H323SignalPDU * h245TunnelTxPDU; H323SignalPDU * alertingPDU; H323SignalPDU * connectPDU; enum ConnectionStates { NoConnectionActive, AwaitingGatekeeperAdmission, AwaitingTransportConnect, AwaitingSignalConnect, AwaitingLocalAnswer, HasExecutedSignalConnect, EstablishedConnection, ShuttingDownConnection, NumConnectionStates } connectionState; PTime setupTime; PTime alertingTime; PTime connectedTime; PTime callEndTime; CallEndReason callEndReason; unsigned q931Cause; unsigned h225version; unsigned h245version; BOOL h245versionSet; BOOL doH245inSETUP; BOOL lastPDUWasH245inSETUP; BOOL detectInBandDTMF; BOOL mustSendDRQ; BOOL mediaWaitForConnect; BOOL transmitterSidePaused; BOOL earlyStart; BOOL startT120; PString t38ModeChangeCapabilities; PSyncPoint digitsWaitFlag; BOOL endSessionNeeded; BOOL endSessionSent; PSyncPoint endSessionReceived; PTimer enforcedDurationLimit; // Used as part of a local call hold operation involving MOH PChannel * holdMediaChannel; BOOL isConsultationTransfer; /** Call Intrusion flag and parameters */ BOOL isCallIntrusion; unsigned callIntrusionProtectionLevel; RTP_SessionManager rtpSessions; enum FastStartStates { FastStartDisabled, FastStartInitiate, FastStartResponse, FastStartAcknowledged, NumFastStartStates }; FastStartStates fastStartState; H323LogicalChannelList fastStartChannels; #if PTRACING static const char * const ConnectionStatesNames[NumConnectionStates]; friend ostream & operator<<(ostream & o, ConnectionStates s) { return o << ConnectionStatesNames[s]; } static const char * const FastStartStateNames[NumFastStartStates]; friend ostream & operator<<(ostream & o, FastStartStates s) { return o << FastStartStateNames[s]; } #endif // The following pointers are to protocol procedures, they are pointers to // hide their complexity from the H323Connection classes users. H245NegMasterSlaveDetermination * masterSlaveDeterminationProcedure; H245NegTerminalCapabilitySet * capabilityExchangeProcedure; H245NegLogicalChannels * logicalChannels; H245NegRequestMode * requestModeProcedure; H245NegRoundTripDelay * roundTripDelayProcedure; H450xDispatcher * h450dispatcher; H4502Handler * h4502handler; H4504Handler * h4504handler; H4506Handler * h4506handler; H45011Handler * h45011handler; OpalRFC2833 * rfc2833handler; OpalT120Protocol * t120handler; OpalT38Protocol * t38handler; // The In-Band DTMF detector. This is used inside an audio filter which is // added to the audio channel. PDTMFDecoder dtmfDecoder; // used to detect remote NAT endpoints BOOL remoteIsNAT; private: PChannel * SwapHoldMediaChannels(PChannel * newChannel); PMutex outerMutex; PMutex innerMutex; }; PLIST(H323ConnectionList, H323Connection); PDICTIONARY(H323ConnectionDict, PString, H323Connection); PDICTIONARY(H323CallIdentityDict, PString, H323Connection); #endif // __OPAL_H323CON_H /////////////////////////////////////////////////////////////////////////////