The Media Gateway to Media Controller Protocol (MGCP)
Olivier Hersent · 2010
MGCP is designed to interface a media gateway controller and media gateway and supports a centralized call control model. The protocol is text-based, offering a set of simple primitives. MGCP call agents and gateways exchange ‘transactions’, composed of one command, optional provisional responses, and a final response. A command in the commands in process pile expires as soon as the MGCP execution engine has generated a final response. MGCP also provides a way for the sender of a command to acknowledge previous responses: the response acknowledgment attribute contains a range of confirmed transaction IDs. The standard MGCP package line provides only a limited set of capabilities to control a business phone user interface: activation of a visual message-waiting indicator, caller ID, distinctive ringing. The flexibility of MGCP has also made possible the first comprehensive implementations of residential or Centrex features for business telephony. Controlled Vocabulary Terms multimedia communication; network servers; protocols