[SR-Users] Peculiar Kamailio Asterisk behavior on outbound calls

[Wilkins, Steve]

Hi All,

Issue: when a Call is made through Kamailio and Asterisk.  Asterisk uses incorrect Video RTP Payload Type when sending Video packets.

I have a situation where I make a call from Device A to Device B and Device A is Registered in Kamailio.  When Device A Calls Device B, Kamailio sends an 'INVITE' to Asterisk, Asterisk then  'INVITES' Device B.  I get two-way Audio, the call stays connected, however, when Video packets are sent to Device B, the RTP Payload Type is incorrect.  The port is correct, but just not the Payload Type.

Here is where I think Kamailio is involved. In the first Invite from Kamailio to Asterisk, one of the offered Video codecs is '100 H264'; interesting enough, Device B wants to use '115 H264' and when Asterisk sends out Video packets, it is using '100' instead of '115', and of course I have no Video.  I don't know if this is just a coincidence but it sure seems like that is where the issue may lie.

Has anyone ever seen this behavior?  The Asterisk teams does not think it's an Asterisk issue.

Thank you,
-Steve
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