Sounds like these SIP packets determine when a call starts and when a call ends and that you can assign some kind of callid to that unique call.

I've seen a lot of stupid protocols, but I would be surprised if SIP, Session Initiation Protocol , didn't provide this callid, since this seems to be the entire purpose behind SIP

In reply to Re^4: dumping hashes to pcap files by Anonymous Monk
in thread dumping hashes to pcap files by bigmoose

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