Thanks for reading my post!!! First off, we have Company A and Company B. Both of them have 3cx w/ Spa400 as gateway. No problems so far, they can call, receive and all. They are in VPN so they can communicate together ( of course ) so if I call from the external to B, I can contact phones from A since they have the same phone extension on both system. If user 1 (from company A) setup his phone to forward to his celular, lets say 555-4444, and someone call him through the telephone number of Company A, everything goes All right. I get transfered to his cellular ( using two line, of course._.). But if I call Company B and do extension of User 1, it doesnt work at all. Remove the call forward and no problem, it'll call to that phone. If you have any Idea how to fix this, or if you need more infos, just tag me over here Thanks!!! DomoJP!