Same problem Wneh I use IP phone or ATA as external ext but
Same problem Wneh I use IP phone or ATA as external ext but soft phones are fine.
I tested: Grandstream handyTone 488, BT200 BT101 GXP2000. all same.
but I'm 100%sure is not port problem because soft phone are fine.
My problem as:
I got Grandtream GXP-2000 & BT 200 BT 101 IP phone and act as internal Extension all good. But when I use it as external Extensions, it’s not working: can make any phone calls from this phone. But incoming call looks like can not pick up, after I pick up the handset, the caller pone still keep ringing look this phone and no any voice.
I have make sure the box extension is external, and bind to media server, under that "extension configuration". Also make sure I'm using stun.xten.com as Stun on the phone same stun server I’m using in 3CX. if I use soft phone for external extension all good. just when I use IP phone (3 brand, all same) with same problem.
for the server, there is No firewall anymore, so,I think this is no port issues. I'm not sure why the phone can make cal l but can not receive calls.
The Version of 3CX Phone System v3.1.2434.0 New edition.
The Network:
ADSL service from a ADSL2+ modem router. Statica IP
The router Lan IP is 192.168.1.1
The service of PBX IP is 192.168.1.2
Port Forwarding: From router, I setup DMZ forward all port to 192.168.1.2
There is NAT& Firewall on the router.
In this setup, if I use X-Lite soft phone as external Extension, all working fine.
Just Ip phones not working: can make call to other Extension but can not receive calls.
8001 is soft phone 8012 is IP phone