[Serusers] How to get the via when callforward?

[Charles Wang]

Hi, ALL:

I have three UACs(A, B and C) and register to the same SER.
A make a call to INVITE B, but B have a callforward 
setting to forward this call to C. 
C forwards this call to a PSTN number.

Now, I can find two records for INVITE and BYE from acc table(mysql). 
But how can I find the last forwarder(C) that forwards this call to PSTN?

Can I use uac module to rewrite the From: field? 
But how can I know the uri of C? 


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Best Regards
Charles