[SR-Users] SIP Packet identifier

So im logging lots of information to Syslog to assist our helpdesk in diagnosing customer issues. Im seeing LOTS of user agents that re-use the sip Call-ID ( especially in registers ). What im wanting to be able to do is link a log message ( that I log at some point in my dialplan ) to a specific SIP packet ( viewed from voipmonitor, HOMER, wireshark ). I cant REALLY see anything in the SIP to uniquely identify a packet, however if kamailio provided the UDP packet checksum in a pseudo variable then we could combine that with the sip call-id to hopefully do what im after. does anyone else have any ideas about how do what im after ? -- Sincerely Jay