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1) Log into the server using SSH
2) Run the command "tcpdump -s 0 -i any -w sip-trace.pcap"
3) Reproduce the your issue
4) Stop the tcpdump using CTRL+C
5) Log into the server using WINSCP and download the file "sip-trace.pcap"

Zip up and send in the sip-trace.pcap file (ensure it is zipped) along with the full details of which call the issue occurred on. Ensure you provide the called number, calling number, local extension that answered the call and how many times that number was called in the trace.