[Serusers] Sip:From ..

[kaiser]

Hi,
For billing issue, we always look sip message's "from" field for voip call charge.
At this moment, we get a problem that call forwarding's call charge....
When we use call forwarding in ser proxy, the call goes, but the "from" is the still the calling party number, we hope this forwading call could be pay the called party.

Does any one know how do we write script to modify "From:"(original) URI?
We have look into replace(), but we have trouble to rewrite "from URI" properly.

best regard
gentrice