Media Gateway Control and the Softswitch Architecture in .NET framework

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Media Gateway Control and the Softswitch Architecture
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Figure 6-8 MGCP call setup between two gateways
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a CRCX 1111 EP1@MGAmedianet MGCP 10 C: 1234567 M: recvonly b 200 1111 OK I: AAAA c CRCX 2222 EP2@MGBmedianet MGCP 10 C: 1234567 M: sendrecv v=0 c=IN IP4 1234567 m=audio 11000 RTP/AVP 0 d 200 2222 OK I: BBBB M: recvonly e v=0 c=IN IP4 1236789 m=audio 22000 RTP/AVP 0 MDCX 1112 EP1@MGAmedianet MGCP 10 I: AAAA M: sendrecv v=0 c=IN IP4 1236789 m=audio 22000 RTP/AVP 0 f 200 1112 OK I: AAAA v=0 c=IN IP4 1234567 m=audio 11000 RTP/AVP 0
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The following text describes the messages of Figure 6-8 in more detail a The call agent sends a CRCX command to MGA, specifying that a connection is to be created on endpoint 1 (EP1) The command also specifies the TransactionId (111) and the CallId (1234567) No BearerInformation is sent in this case, because the endpoint is specifically identified, and we assume that the bearer-related information for the line side of the endpoint is already known If that
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Media Gateway Control and the Softswitch Architecture
Media Gateway Control and the Softswitch Architecture
information were not known or if the selection of endpoint were wildcarded, then the bearer information would specify either A-law or m-law The CRCX command specifies the mode to be receive-only for now This means that the endpoint can receive media from the IP network, but cannot send media to the IP network The reason for this choice is the fact that the endpoint does not yet have a session description for the remote end and hence cannot know where to send a media stream The remote end is about to be presented with a session description for the local end, however, and could start to send media before the local endpoint receives a session description for the remote end Therefore, the local endpoint should be prepared to receive media from the remote endpoint b MG A responds to the CRCX command with the same TransactionId, a ConnectionId (AAAA), and a session description indicating voice coded according to G711 m-law (RTP payload format 0) Note that this is the voice coding chosen on the IP side of the endpoint as opposed to the line side of the endpoint It could equally well be some other coding choice such as G728 or G729 c The call agent sends a CRCX command to the second gateway (MG B) Again a specific endpoint (EP2) is indicated in the command The TransactionId is 2222 and the same CallId (1234567) is used The call agent includes a RemoteConnectionDescriptor, which is simply the session description received earlier from MG A This time the CRCX command specifies the mode as send-receive, since a session description for the remote end is available, which means that the endpoint has an address and port to which it can send media d MG B sends a positive response to the CRCX, including a ConnectionId (BBBB) and a session description corresponding to that connection The session description in this case also happens to be G711 m-law coded voice e The call agent sends an MDCX command to the command to the first gateway The command specifically specifies the ConnectionId and includes a RemoteConnectionDescriptor, which is the session description received from MG B Given that a session description is available for the remote end, MG A now has an address and port to which it may send media Therefore, the MDCX command specifies the mode to be send-receive f MG A sends a positive response to the MDCX command g Media can now be exchanged between the two endpoints
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