I have two ISDN Gateways, both slaves to my 16xi PABX.

Sometimes when trying to dial a number on the phones 'Recieved' List (Snom IP Phones) its a SIP format : <sip:0216575034@> (the IP is one of the QuadroISDN Gateways) I get a 'Not Found' Message.

I think that im missing an outbound route to allow this SIP format, what do I need to add?