RFC 3435 (rfc3435) - Page 2 of 210

Media Gateway Control Protocol (MGCP) Version 1

RFC 3435                        MGCP 1.0                    January 2003


   The basic and general MGCP protocol is defined in this document,
   however most media gateways will need to implement one or more MGCP
   packages, which define extensions to the protocol suitable for use
   with specific types of media gateways.  Such packages are defined in
   separate documents.

Table of Contents

   1.     Introduction.................................................5
   1.1    Relation with the H.323 Standards............................7
   1.2    Relation with the IETF Standards.............................8
   1.3    Definitions..................................................9
   1.4    Conventions used in this Document............................9
   2.     Media Gateway Control Interface.............................10
   2.1    Model and Naming Conventions................................10
   2.1.1  Types of Endpoints..........................................10
   2.1.2  Endpoint Identifiers........................................14
   2.1.3  Calls and Connections.......................................16
   2.1.4  Names of Call Agents and Other Entities.....................22
   2.1.5  Digit Maps..................................................23
   2.1.6  Packages....................................................26
   2.1.7  Events and Signals..........................................28
   2.2    Usage of SDP................................................33
   2.3    Gateway Control Commands....................................33
   2.3.1  Overview of Commands........................................33
   2.3.2  EndpointConfiguration.......................................36
   2.3.3  NotificationRequest.........................................37
   2.3.4  Notify......................................................44
   2.3.5  CreateConnection............................................46
   2.3.6  ModifyConnection............................................52
   2.3.7  DeleteConnection (from the Call Agent)......................54
   2.3.8  DeleteConnection (from the gateway).........................58
   2.3.9  DeleteConnection (multiple connections from the Call Agent) 59
   2.3.10 AuditEndpoint...............................................60
   2.3.11 AuditConnection.............................................65
   2.3.12 RestartInProgress...........................................66
   2.4    Return Codes and Error Codes................................69
   2.5    Reason Codes................................................74
   2.6    Use of Local Connection Options and Connection Descriptors..75
   2.7    Resource Reservations.......................................77
   3.     Media Gateway Control Protocol..............................77
   3.1    General Description.........................................78
   3.2    Command Header..............................................79
   3.2.1  Command Line................................................79
   3.2.2  Parameter Lines.............................................82
   3.3    Format of response headers.................................101
   3.3.1  CreateConnection Response..................................104
   3.3.2  ModifyConnection Response..................................105



Andreasen & Foster           Informational