h323.cxx

mgcp协议源代码。支持多种编码：g711

/*
 * h323.cxx
 *
 * H.323 protocol handler
 *
 * Open H323 Library
 *
 * Copyright (c) 1998-2000 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.
 *
 * Contributor(s): ______________________________________.
 *
 * $Log: h323.cxx,v $
 * Revision 1.125  2000/07/15 09:56:37  robertj
 * Changed adding of fake remote capability to after fast start element has been
 *   checked and new parameters (eg frames per packet) has been parsed out of it.
 *
 * Revision 1.124  2000/07/14 14:03:47  robertj
 * Changed fast start connect so if has bad h245 address does not clear call.
 *
 * Revision 1.123  2000/07/13 16:07:22  robertj
 * Fixed ability to receive a H.245 secondary TCP link in a Connect during a fast start.
 *
 * Revision 1.122  2000/07/13 12:35:13  robertj
 * Fixed problems with fast start frames per packet adjustment.
 * Split autoStartVideo so can select receive and transmit independently
 *
 * Revision 1.121  2000/07/10 16:06:59  robertj
 * Added TCS=0 support.
 * Fixed bug where negotiations hang if not fast start and tunnelled but remot does not tunnel.
 *
 * Revision 1.120  2000/07/09 15:24:42  robertj
 * Removed sending of MSD in Setup PDU, is not to spec.
 * Added start of TCS if received TCS from other end and have not already started.
 *
 * Revision 1.119  2000/07/08 19:49:27  craigs
 * Fixed stupidity in handling of fastStart capabilities
 *
 * Revision 1.118  2000/07/04 09:00:54  robertj
 * Added traces for indicating failure of channel establishment due to capability set rules.
 *
 * Revision 1.117  2000/07/04 04:15:38  robertj
 * Fixed capability check of "combinations" for fast start cases.
 *
 * Revision 1.116  2000/07/04 01:16:49  robertj
 * Added check for capability allowed in "combinations" set, still needs more done yet.
 *
 * Revision 1.115  2000/06/17 09:14:13  robertj
 * Moved sending of DRQ to after release complete to be closer to spec, thanks Thien Nguyen
 *
 * Revision 1.114  2000/06/07 05:48:06  robertj
 * Added call forwarding.
 *
 * Revision 1.113  2000/06/05 06:33:08  robertj
 * Fixed problem with roud trip time statistic not being calculated if constant traffic.
 *
 * Revision 1.112  2000/06/03 03:16:39  robertj
 * Fixed using the wrong capability table (should be connections) for some operations.
 *
 * Revision 1.111  2000/05/23 11:32:36  robertj
 * Rewrite of capability table to combine 2 structures into one and move functionality into that class
 *    allowing some normalisation of usage across several applications.
 * Changed H323Connection so gets a copy of capabilities instead of using endponts, allows adjustments
 *    to be done depending on the remote client application.
 *
 * Revision 1.110  2000/05/22 05:21:36  robertj
 * Fixed race condition where controlChannel variable could be used before set.
 *
 * Revision 1.109  2000/05/16 08:14:30  robertj
 * Added function to find channel by session ID, supporting H323Connection::FindChannel() with mutex.
 * Added function to get a logical channel by channel number.
 *
 * Revision 1.108  2000/05/16 02:06:00  craigs
 * Added access functions for particular sessions
 *
 * Revision 1.107  2000/05/09 12:19:31  robertj
 * Added ability to get and set "distinctive ring" Q.931 functionality.
 *
 * Revision 1.106  2000/05/09 04:12:36  robertj
 * Changed fast start to offer multiple codecs instead of only the preferred one.
 *
 * Revision 1.105  2000/05/08 14:32:26  robertj
 * Fixed GNU compiler compatibility problems.
 *
 * Revision 1.104  2000/05/08 14:07:35  robertj
 * Improved the provision and detection of calling and caller numbers, aliases and hostnames.
 *
 * Revision 1.103  2000/05/05 05:05:55  robertj
 * Removed warning in GNU compiles.
 *
 * Revision 1.102  2000/05/02 04:32:26  robertj
 * Fixed copyright notice comment.
 *
 * Revision 1.101  2000/04/28 13:01:44  robertj
 * Fixed problem with adjusting tx/rx frame counts in capabilities during fast start.
 *
 * Revision 1.100  2000/04/18 23:10:49  robertj
 * Fixed bug where fast starts two video recievers instread of receiver and transmitter.
 *
 * Revision 1.99  2000/04/14 21:09:51  robertj
 * Work around for compatibility problem wth broken Altigen AltaServ-IG PBX.
 *
 * Revision 1.98  2000/04/14 20:03:05  robertj
 * Added function to get remote endpoints application name.
 *
 * Revision 1.97  2000/04/14 17:31:05  robertj
 * Fixed bug where checking the error code on the wrong channel. Caused hang ups.
 *
 * Revision 1.96  2000/04/13 18:08:46  robertj
 * Fixed error in SendUserInput() check for value string, previous change was seriously broken.
 *
 * Revision 1.95  2000/04/11 20:07:01  robertj
 * Added missing trace strings for new call end reasons on gatekeeper denied calls.
 *
 * Revision 1.94  2000/04/11 04:02:48  robertj
 * Improved call initiation with gatekeeper, no longer require @address as
 *    will default to gk alias if no @ and registered with gk.
 * Added new call end reasons for gatekeeper denied calls.
 *
 * Revision 1.93  2000/04/10 20:37:33  robertj
 * Added support for more sophisticated DTMF and hook flash user indication.
 *
 * Revision 1.92  2000/04/06 17:50:16  robertj
 * Added auto-start (including fast start) of video channels, selectable via boolean on the endpoint.
 *
 * Revision 1.91  2000/04/05 03:17:31  robertj
 * Added more RTP statistics gathering and H.245 round trip delay calculation.
 *
 * Revision 1.90  2000/03/29 04:42:19  robertj
 * Improved some trace logging messages.
 *
 * Revision 1.89  2000/03/29 02:14:45  robertj
 * Changed TerminationReason to CallEndReason to use correct telephony nomenclature.
 * Added CallEndReason for capability exchange failure.
 *
 * Revision 1.88  2000/03/27 22:43:11  robertj
 * Fixed possible write to closed channel on shutdown when control channel separate.
 *
 * Revision 1.87  2000/03/25 02:01:50  robertj
 * Added adjustable caller name on connection by connection basis.
 *
 * Revision 1.86  2000/03/22 01:30:34  robertj
 * Fixed race condition in accelerated start (Cisco compatibility).
 *
 * Revision 1.85  2000/03/21 01:43:59  robertj
 * Fixed (faint) race condition when starting separate H.245 channel.
 *
 * Revision 1.84  2000/03/21 01:08:10  robertj
 * Fixed incorrect call reference code being used in originated call.
 *
 * Revision 1.83  2000/03/07 13:54:28  robertj
 * Fixed assert when cancelling call during TCP connect, thanks Yura Ershov.
 *
 * Revision 1.82  2000/03/02 02:18:13  robertj
 * Further fixes for early H245 establishment confusing the fast start code.
 *
 * Revision 1.81  2000/03/01 02:09:51  robertj
 * Fixed problem if H245 channel established before H225 connect.
 *
 * Revision 1.80  2000/01/07 08:21:32  robertj
 * Added status functions for connection and tidied up the answer call function
 *
 * Revision 1.79  2000/01/04 01:06:06  robertj
 * Removed redundent code, thanks Dave Harvey.
 *
 * Revision 1.78  2000/01/04 00:14:53  craigs
 * Added extra states to AnswerCall
 *
 * Revision 1.77  1999/12/23 23:02:35  robertj
 * File reorganision for separating RTP from H.323 and creation of LID for VPB support.
 *
 * Revision 1.76  1999/12/11 02:21:00  robertj
 * Added ability to have multiple aliases on local endpoint.
 *
 * Revision 1.75  1999/12/09 20:30:54  robertj
 * Fixed problem with receiving multiple fast start open fields in multiple PDU's.
 *
 * Revision 1.74  1999/11/23 03:38:51  robertj
 * Fixed yet another call termination reason code error.
 *
 * Revision 1.73  1999/11/22 10:07:23  robertj
 * Fixed some errors in correct termination states.
 *
 * Revision 1.72  1999/11/20 04:36:56  robertj
 * Fixed setting of transmitter channel numbers on receiving fast start.
 *
 * Revision 1.71  1999/11/19 13:00:25  robertj
 * Added call token into traces so can tell which connection is being cleaned up.
 *
 * Revision 1.70  1999/11/19 08:16:08  craigs
 * Added connectionStartTime
 *
 * Revision 1.69  1999/11/17 04:22:59  robertj
 * Fixed bug in incorrect termination state when making a fast start call.
 *
 * Revision 1.68  1999/11/17 00:01:12  robertj
 * Improved determination of caller name, thanks Ian MacDonald
 *
 * Revision 1.67  1999/11/14 11:25:34  robertj
 * Fixed bug with channel close callback being called twice when fast starting.
 *
 * Revision 1.66  1999/11/13 14:11:24  robertj
 * Fixed incorrect state on fast start receive.
 *
 * Revision 1.65  1999/11/10 23:29:45  robertj
 * Changed OnAnswerCall() call back function  to allow for asyncronous response.
 *
 * Revision 1.64  1999/11/06 11:58:24  robertj
 * Changed clean up to delete logical channels before channel destructor is called.
 *
 * Revision 1.63  1999/11/06 11:03:58  robertj
 * Fixed bug in fast start with H245 channel opening multiple channels.
 * Fixed bug in clean up, write of release complete if TCP connection failed.
 *
 * Revision 1.62  1999/11/06 05:37:45  robertj
 * Complete rewrite of termination of connection to avoid numerous race conditions.
 *
 * Revision 1.61  1999/11/05 08:24:43  robertj
 * Fixed bug in receiver refusing fast start, then not being able to start normally.
 *
 * Revision 1.60  1999/10/30 12:34:46  robertj
 * Added information callback for closed logical channel on H323EndPoint.
 *
 * Revision 1.59  1999/10/29 14:19:14  robertj
 * Fixed incorrect termination code when connection closed locally.
 *
 * Revision 1.58  1999/10/29 02:26:18  robertj
 * Added reason for termination code to H323Connection.
 *
 * Revision 1.57  1999/10/19 00:04:57  robertj
 * Changed OpenAudioChannel and OpenVideoChannel to allow a codec AttachChannel with no autodelete.
 *
 * Revision 1.56  1999/10/16 03:47:49  robertj
 * Fixed termination of gatekeeper RAS thread problem
 *
 * Revision 1.55  1999/10/14 12:05:03  robertj
 * Fixed deadlock possibilities in clearing calls.
 *
 * Revision 1.54  1999/10/10 08:59:47  robertj
 * no message
 *
 * Revision 1.53  1999/10/09 01:18:23  craigs
 * Added codecs to OpenAudioChannel and OpenVideoDevice functions
 *
 * Revision 1.52  1999/10/08 08:31:18  robertj
 * Fixed problem with fast start fall back to capability exchange
 *
 * Revision 1.51  1999/10/07 03:26:58  robertj
 * Fixed some fast-start compatbility problems.
 *
 * Revision 1.50  1999/09/23 07:33:53  robertj
 * Fixed some fast start/245 tunnelling bugs, some odd cases.
 *
 * Revision 1.49  1999/09/23 07:25:12  robertj
 * Added open audio and video function to connection and started multi-frame codec send functionality.
 *
 * Revision 1.48  1999/09/21 14:09:39  robertj
 * Removed warnings when no tracing enabled.
 *
 * Revision 1.47  1999/09/15 01:26:27  robertj
 * Changed capability set call backs to have more specific class as parameter.
 *
 * Revision 1.46  1999/09/14 14:26:17  robertj
 * Added more debug tracing.
 *
 * Revision 1.45  1999/09/10 03:36:48  robertj
 * Added simple Q.931 Status response to Q.931 Status Enquiry
 *
 * Revision 1.44  1999/09/08 04:05:49  robertj
 * Added support for video capabilities & codec, still needs the actual codec itself!
 *
 * Revision 1.43  1999/08/31 12:34:19  robertj
 * Added gatekeeper support.
 *
 * Revision 1.42  1999/08/27 15:42:44  craigs
 * Fixed problem with local call tokens using ambiguous interface names, and connect timeouts not changing connection state
 *
 * Revision 1.41  1999/08/25 05:11:22  robertj
 * File fission (critical mass reached).
 * Improved way in which remote capabilities are created, removed case statement!
 * Changed MakeCall, so immediately spawns thread, no black on TCP connect.
 *
 * Revision 1.40  1999/08/14 03:26:45  robertj
 * Compiler compatibility problems.
 *
 * Revision 1.39  1999/08/10 04:20:26  robertj
 * Fixed constness problems in some PASN_Choice casts.
 *
 * Revision 1.38  1999/08/08 10:03:33  robertj
 * Fixed capability selection to honor local table priority order.
 *
 * Revision 1.37  1999/07/23 02:37:53  robertj
 * Fixed problems with hang ups and crash closes of connections.
 *
 * Revision 1.36  1999/07/19 02:01:02  robertj
 * Fixeed memory leask on connection termination.
 * Fixed connection "orderly close" on endpoint termination.
 *
 * Revision 1.35  1999/07/18 14:57:29  robertj
 * Fixed bugs in slow start with H245 tunnelling, part 4.
 *
 * Revision 1.34  1999/07/18 14:29:31  robertj
 * Fixed bugs in slow start with H245 tunnelling, part 3.
 *
 * Revision 1.33  1999/07/18 13:59:12  robertj
 * Fixed bugs in slow start with H245 tunnelling, part 2.
 *
 * Revision 1.32  1999/07/18 13:25:40  robertj
 * Fixed bugs in slow start with H245 tunnelling.
 *
 * Revision 1.31  1999/07/18 10:19:39  robertj
 * Fixed CreateCapability function: missing break's in case!
 *
 * Revision 1.30  1999/07/17 06:22:32  robertj
 * Fixed bug in setting up control channel when initiating call (recently introduced)
 *
 * Revision 1.29  1999/07/16 16:04:41  robertj
 * Bullet proofed local capability table data entry.
 *
 * Revision 1.28  1999/07/16 14:04:47  robertj
 * Fixed bug that caused signal channel to be closed, forgot to disable connect time.
 *
 * Revision 1.27  1999/07/16 06:15:59  robertj
 * Corrected semantics for tunnelled master/slave determination in fast start.
 *
 * Revision 1.26  1999/07/16 02:15:20  robertj
 * Fixed more tunneling problems.
 * Fixed fastStart initiator matching response to correct channels.
 *
 * Revision 1.25  1999/07/16 00:51:03  robertj
 * Some more debugging of fast start.
 *
 * Revision 1.24  1999/07/15 14:45:36  robertj
 * Added propagation of codec open error to shut down logical channel.
 * Fixed control channel start up bug introduced with tunnelling.
 *
 * Revision 1.23  1999/07/15 09:04:31  robertj
 * Fixed some fast start bugs
 *
 * Revision 1.22  1999/07/14 06:06:14  robertj
 * Fixed termination problems (race conditions) with deleting connection object.
 *
 * Revision 1.21  1999/07/13 09:53:24  robertj
 * Fixed some problems with jitter buffer and added more debugging.
 *
 * Revision 1.20  1999/07/13 02:50:58  craigs
 * Changed semantics of SetPlayDevice/SetRecordDevice, only descendent
 *    endpoint assumes PSoundChannel devices for audio codec.
 *
 * Revision 1.19  1999/07/10 02:59:26  robertj
 * Fixed ability to hang up incoming connection.
 *
 * Revision 1.18  1999/07/10 02:51:36  robertj
 * Added mutexing in H245 procedures. Also fixed MSD state bug.
 *
 * Revision 1.17  1999/07/09 14:59:59  robertj
 * Fixed GNU C++ compatibility.
 *
 * Revision 1.16  1999/07/09 06:09:49  robertj
 * Major implementation. An ENORMOUS amount of stuff added everywhere.
 *
 * Revision 1.15  1999/06/25 10:25:35  robertj
 * Added maintentance of callIdentifier variable in H.225 channel.
 *
 * Revision 1.14  1999/06/22 13:45:05  robertj
 * Added user question on listener version to accept incoming calls.
 *
 * Revision 1.13  1999/06/14 06:39:08  robertj
 * Fixed problem with getting transmit flag to channel from PDU negotiator
 *
 * Revision 1.12  1999/06/14 05:15:55  robertj
 * Changes for using RTP sessions correctly in H323 Logical Channel context
 *
 * Revision 1.11  1999/06/13 12:41:14  robertj
 * Implement logical channel transmitter.