Hi,
I am implementing a SIP trace that would show how many SIP connections (calls) has taken place in the network for a certain period of time and also show complete detailed SIP messages with directions.
I am now in a stage that I am able to get all the UDP messages in a file using libpcap. In my network SIP runs over UDP. I have the following doubts.
1) How do I Identify a message is a SIP from all UDP messages (DNS etc) dumped in a file?.
2) I want to know if a message is going from SIP server to SIP UA or SIP UA to SIP server, by parsing a SIP message. How can I do that?.
3) How to identify a group of SIP messages pertaining to a call?. I see that callID is unique for a call. Can we use that field to group all the SIP messages pertaining to the same call?.
Your reply would be of great help to me.
Thanks,
Balaji
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