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This document describes an application programming interface and a corresponding protocol (MGCP) for controlling Voice over IP (VoIP) Gateways from external call control elements. The MGCP assumes a call control architecture where the call control ’intelligence’ is outside the gateways and handled by external call control elements. Arango, Dugan, Elliott, Huitema, Pickett [Page 1] draft-huitema-MGCP-v0r1-01.txt Tue Dec 8 19:59:36 1998 2 Internet Draft Media Gateway Control Protocol (MGCP) November 9, 1998 The document is structured in 6 main sections: * The introduction presents the basic assumptions and the relation to other protocols such as H.323, RTSP, SAP or SIP. * The interface section presents a conceptual overview of the MGCP, presenting the naming conventions, the usage of the session description protocol SDP, and the five procedures that compose MGCP: Notifications Request, Notification, Create Connection, Modify Connection, Delete Connection, AuditEndpoint, AuditConnection and RestartInProgress. * The protocol description section presents the MGCP encodings, which are based on simple text formats, and the transmission procedure over UDP. * The security section presents the security requirement of MGCP, and its usage of IP security services (IPSEC). * The event packages section provides an initial definition of packages and event names. * The description of the changes made in combining SGCP 1.1 and IPDC to create MGCP 0.1. Arango, Dugan, Elliott, Huitema, Pickett [Page 2] draft-huitema-MGCP-v0r1-01.txt Tue Dec 8 19:59:36 1998 3 Internet Draft Media Gateway Control Protocol (MGCP) November 9, 1998 Table of