I have the following scenario.

1) A call comes into a pri connected to a 3845 gateway and gets forwarded via sip to a sip device.

2) The sip device makes a call to an end user through the same gateway and connects the call.

It is basically doing a call and transfer, but I get the ANI from the original call after the transfer. Is it possible to use the ANI from the SIP device and replace the original ANI during the transfer? I would like the end user to see the caller id from the SIP device while on the call, and not from the original call. I was reading about sip replaces header, but I am not sure how to implement it. Thanks.