http://www.rfc-editor.org/rfc/rfc2705.txt
RFC 2705: Media Gateway Control Protocol (MGCP) Version 1.0, M. Arango, A. Dugan, I. Elliott, C. Huitema, S. Pickett1999-10-01T23:00:00-00:00This 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. This memo provides information for the Internet community.