RFC 2705 (rfc2705) - Page 3 of 134

Media Gateway Control Protocol (MGCP) Version 1

RFC 2705         Media Gateway Control Protocol (MGCP)      October 1999


         2.3.1.  EndpointConfiguration ........................... 32
         2.3.2.  NotificationRequest ............................. 33
         2.3.3.  CreateConnection ................................ 38
         2.3.4.  ModifyConnection ................................ 44
         2.3.5.  DeleteConnection (from the Call Agent) .......... 46
         2.3.6.  DeleteConnection (from the VoIP gateway) ........ 51
         2.3.7.  DeleteConnection (multiple connections, from the  51
         2.3.8.  Audit Endpoint .................................. 52
         2.3.9.  Audit Connection ................................ 55
         2.3.10.  Restart in progress ............................ 56
      2.4.  Return codes and error codes. ........................ 58
      2.5.  Reason Codes ......................................... 61
   3.  Media Gateway Control Protocol ............................ 61
      3.1.  General description .................................. 62
      3.2.  Command Header ....................................... 62
         3.2.1.  Command line .................................... 62
            3.2.1.1.  Coding of the requested verb ............... 63
            3.2.1.2.  Transaction Identifiers .................... 63
            3.2.1.3.  Coding of the endpoint identifiers and ..... 64
            3.2.1.4.  Coding of the protocol version ............. 65
         3.2.2.  Parameter lines ................................. 65
            3.2.2.1.  Response Acknowledgement ................... 68
            3.2.2.2.  Local connection options ................... 68
            3.2.2.3.  Capabilities ............................... 70
            3.2.2.4.  Connection parameters ...................... 71
            3.2.2.5.  Reason Codes ............................... 72
            3.2.2.6.  Connection mode ............................ 73
            3.2.2.7.  Coding of event names ...................... 73
            3.2.2.8.  RequestedEvents ............................ 74
            3.2.2.9.  SignalRequests ............................. 76
            3.2.2.10.  ObservedEvent ............................. 76
            3.2.2.11.  RequestedInfo ............................. 76
            3.2.2.12.  QuarantineHandling ........................ 77
            3.2.2.13.  DetectEvents .............................. 77
            3.2.2.14.  EventStates ............................... 77
            3.2.2.15.  RestartMethod ............................. 78
            3.2.2.16.  Bearer Information ........................ 78
      3.3.  Format of response headers ........................... 78
      3.4.  Formal syntax description of the protocol ............ 81
      3.5.  Encoding of the session description .................. 86
         3.5.1.  Usage of SDP for an audio service ............... 86
         3.5.2.  Usage of SDP in a network access service ........ 87
         3.5.3.  Usage of SDP for ATM connections ................ 90
         3.5.4.  Usage of SDP for local connections .............. 91
      3.6.  Transmission over UDP ................................ 91
         3.6.1.  Providing the At-Most-Once functionality ........ 91
         3.6.2.  Transaction identifiers and three ways handshake. 92
         3.6.3.  Computing retransmission timers ................. 93



Arango, et al.               Informational