Switchvox - How to tell the origin of an INVITE in a packet capture
A packet capture is a useful tool for diagnosing many SIP related issues. When reading a packet capture one of the first things needed is to identify each device communicating on a given call. This can usually be done by correlating the IP addresses present in the capture with either a phone or the Switchvox IPs in the web interface, but this can also be done directly from the packet capture itself.
Locate an invite or 200 OK message from the device you want to identify and expand the SIP Header.
Then look for the User-Agent field:
In this call example the device sending the INVITE is a Digium D50 phone
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