[OpenSIPS-Users] Is there a way to Change SIP Header CONTACT field

[Zilla Sun]

I setup Opensips with Rtpproxy between our SIP Server and remote GW
(behind NAT). I got most of the part work, and having a problem with
contact field. I would like to replace the contact field IP address -
but can not find a way doing it. this is the deailts - 

SIP Server - 10.10.10.1 <--> 10.10.10.100 Opensips 60.1.1.1 <-->
62.1.1.1 Nat 192.168.1.1 <--> 192.168.1.10 SIP GW 

Due to the SIP Server setup, I need to replace the contact field IP
address of an INVITE sending from SIP GW (192.168.1.10 to 10.10.10.100). 

Thanks for any advice.
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