Hi,

How does one determine which part of a SIP conversation an ACK packet is responding to?  I would have guessed that it would be in tne CSeq, but that field just says, for example,
  
    CSeq: 3 ACK

The only method I have come up with so far is looking at the source and destination ports + the destination of the Request-LIne and try to determine the most recent message it might be responding to.

Thanks,

Mark Price