[Users] Call forward record and Remove from callid in Openser

Hi All, I hope someone can help me with the following questions I have. 1. I have set up accounting module for record the call, simple outgoing call and incoming call are ok. However, if a sip phone activated the call forward, the call record doesn't show which sip client forward the call. e.g. A call B and B is the sip phone which forward the call to C. In the record, I can only see A call C. How can I see a record that B call C instead of A call C in the record? 2. I have connected to a PSTN gateway, and i have some internal sip users which can make a pstn call, the sip proxy will send their own private number a caller id to the pstn gateway. Since the callid is a invalid number, many Mobile phone networks provider reject the call. I want to remove the from callid when the call being send to the pstn gateway, how can i do this? If someone can send me the code that will be great. -- Howard Tang