[Users] identifying what an ACK is in response to

[Mark Price]

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
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