[Serusers] Re-writing the "To: " field

Dear Sirs: I'm configuring a pre-paid scenario with a third party gateway. The GW guys gave me a GW number (a.k.a Username) and a password, so i'm able to place calls in the PSTN only if i am registered in my SIP Proxy with the username the GW guys gave me. The thing is that i want all my users to be able to use this channel to reach the PSTN. If I call this way (sip:01xxxxx@theirdomain.com) i succesfully reach the PSTN but when i call this other way (sip:01xxxxx@mydomain.com) their server returns a (403) Forbidden. I'm aware that this behavior is correct (due to domain verifications) but i need to know how could I, in my SIP Proxy, rewrite the "To: " field in order to write the correct domain when i place a call like this: (sip:01xxxxx@mydomain.com). I believe that if I reach a solution in this particular issue i would be able to let all my subscribers to use individualy a GW account. If anyone can give me a clue of how could i reach a solution or any commets regarding this partucular issue, i would be really grateful. Best regards. Andr�s Parra L. andresparra(a)ipsofactum.com Ipsofactum Ltd. www.ipsofactum.com __________________________________ Do you Yahoo!? Yahoo! Mail - Helps protect you from nasty viruses. http://promotions.yahoo.com/new_mail