Sure attached.

packet 7 is the initial INVITE, this has Cseq of 17027

then there is a 401, using dialog module this increments the Cseq as expected to 17028 on packet 12 and the call proceeds.

There is 100rel required in the 183 with SDP as expected which has RSeq: 981875949 (packet 14)

The PRACK for this 183 is sent in packet 17 with RAck: 981875949 17027 INVITE

The Cseq inthe RAck header has not incremented and remains the same as the initial INVITE before authentication.

Many thanks
trace-rack.zip


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