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Capturing handshake between a SIP handset & PBX


First of all apologies for the basic question.

I'm trying to capture the handshake packets when a SIP handset registers with a PABX & i'm struggling.

I enter the PBX details inc usernames, passwords, etc into the SIP handset. Then i unplug the handset & start the Wireshark then plug it back in.

Once the handset has booted back up I stop the trace & use the display filter to look at the ip address of the PBX to hopefully find the acknowledgement between the PBX & SIP handset but nothing appears. The PBX confirms the handset is registered.

Any idea's?

Thanks. Lee.