[Freeswitch-users] Call FS users from external gateway.

I've got my users in FS in /directory/users.xml in a certain domain and user-context = public. I've got my FS hooked up to a SIP gateway for connection to the GSM-world. I'm able to route calls to my SIP gateway for outbound calls, but incoming calls to my FS from the GSM-world does not get routed to my users in FS. My users have the ID's "+4412345678", and incoming calls from my SIP gateway does contain +4412345678@my-sip-gateway-domain.com I guess I need to tell FS somehow that incoming calls from my SIP gateway should match my user IDs in users from my /directory/users.xml. But how to I do this?