MGCP Sessions

MGCP Sessions

End-to-end calls are established by connecting two or more endpoints, as illustrated in Figure 6-37. To establish a call, the call agent instructs the gateway associated with each endpoint to make a connection with a specific endpoint or an endpoint of a particular type. The gateway returns the session parameters of its connection to the call agent, which in turn sends these session parameters to the other gateway. With this method, each gateway acquires the necessary session parameters to establish RTP sessions between the endpoints. All connections associated with the same call share a common call ID and the same media stream. At the conclusion of a call, the call agent sends a delete connection request to each gateway.