RTP/SAVP negotiation - verify success

Hi guys.
I have the following capture of SIP / SDP (attached).
I want to make sure that RTP/SAVP negotiation was successful. Could you please guide me to the package sent which is confirming that negotiation has been successfully taken place?

Also, I am confused about the different Call-IDs I have found in between the conversation. Could you please explain why this is happening.


debug.txt (12.0 KB)

Most parameters are not negotiated. Each party says what they can accept, but there is no formal agreement on a common subset.

The test of successful negotiation is really that there isn’t an immediate BYE, as it is possible to send an uaccepatable response, but there is no way of rejecting it, so the UAC will send ACK followed immediately by BYE.