> I have collected a series of SIP messages, which may contain several
> different calls. Can Call-ID be used as key words to trace an unique call?

How did you collect the SIP messages?
If you have used "ethereal" the tool is able to show a graph of the messages
of dedicated calls.

> And how can I find out the final state of each call?

By interpreting the SIP messages. 
E.g.: If a BYE has arrived and been responded by 200 OK, than the call is
over.

Franz

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