[Freeswitch-users] Change the DID

Hello, I have a problem with the DID of a SIP trunk between our central office(using Trixbox) and the new branch in the same city (using FreeSWITCH). When a call is made from FreeSWITCH to the Trixbox, the Trixbox receives $1 in the DID (FROM-DID variable). How can I specified a different value for the DID? Thank you, Ricardo Saavedra