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MGCP assumes a call control architecture where the call control "intelligence" is outside the gateways and handled by external call control elements known as Call Agents. The MGCP assumes that these call control elements, or Call Agents, will synchronize with each other to send coherent commands and responses to the gateways (mdia servers) under their control. If this assumption is violated, inconsistent behavior should be expected. MGCP does not define a mechanism for synchronizing Call Agents. MGCP is, in essence, a master/slave protocol, where the gateways are expected to execute commands sent by the Call Agents.
This example demonstrates how MGCP RA can be used as Media Gateway Call Controller to control the Media Gateway (Media Server)
Prior knowledge of MGCP is necessary to understand this example. To learn about MGCP, look at RFC 3435. Knowledge of MGCP RA is also desired.