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BIB and RTP port

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BIB and RTP port
cisco call manager sip trunk
Answer
4/25/10 10:05 PM
Hi,

We are developing a recorder.
We have the following system:  Call Manager 6, Cisco Phones 7942 and 7962
 
When a recording session is invoked (automatically), a SIP trunk is established between the CM and my recorder server. The BIB / Build-In-Bridge of the agent phone delivers two RTP streams to the recorder server.
 
CM INVITES my recorder to both calls via SIP Trunk. The SDP information received by the recorder from the CM indicates:

          Media Description, name and address (m): audio 4000 RTP/AVP 0 101

My problem is that the recorders need to know the value of the RTP port used by the BIB / Build-In-Bridge (agent) phone to send the RTP stream to the recorder.

Why is the value of the port in the SDP media description 4000?
Is there a way to obtain the real value of the RTP port  used by the BIB / Build-In-Bridge (agent) phone?

Thanks
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RE: BIB and RTP port
Answer
5/2/10 10:32 PM as a reply to Fabrice Brenzi.
Hi,
 
If I use a Cisco phone configured to communicate with the call manager with SIP and not SCCP, the SDP information received by the recorder from the CM is as follows:


          Media Description, name and address (m): audio 31238 RTP/AVP 0 101


The value of the port indicated in this SDP (31238) does not correspond to the port used by the BIB / Build-In-Bridge (agent) phone to send the RTP stream to the recorder.
 
Is there a way (configuring the call manager or JTAPI or any other technology) to obtain the real value of the RTP port used by the BIB / Build-In-Bridge (agent) phone?
 
Thanks
 
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