| Abstract
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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. MGCP assumes a call
control architecture where the call control "intelligence" is outside
the gateways and handled by external call control elements.
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 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 1.0.
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