Hey guys, Wondering if anyone out there is still using BT200 and or GXP2000 phones. Have a customer who had an old asterisk system usings these phones. The askerisk system died so we did a quick setup of 3CX which worked great for the internal phones. We are however seeing an issue trying to setup external phones. We are able to get 1 phone online from a location and make/receive phone calls. But we are not able to get a second phone online. It will never register.... We have tried following the STUN/NAT settings on the following URL but when we turn on NAT Traversal (STUN): and/or Use RFC3581 Symmetric Routing we are no longer able to get inbound audio only outbound audio. http://www.3cx.com/blog/voip-howto/remote-extensions/ Does anyone have any advice or recommendations besides replacing the phones with a newer model. We are talking 200+ phones so a fairly large expense.