External SIP phone

[thefinisher]

Hi
I am trying to configure a SIP phone (grandstream 2000) that is located on a remote network behind a NAT firewall and the 3CX PBX is located behind a firewall as well.
I have opened ports on the firewall on the network with the 3CX PBX
Port 5060 UDP SIP
Port 3478 (UDP) STUN
Port 9000-9003 RTP

The seem to be able to register properly but I do not get any audio during calls . what other ports need to be open to mak this configuration work

 

[webguyz]

On the remote Grandstream 2000 do you have STUN enabled? Stun allows remote extensions to work by keeping an inbound port open so the 3CX server can communicate thru the NAT firewall at the remote.

Take a look at the status log (in debug) and when making a call you can see what IP's an audio port is being opened for. The ip on the remote side should be the IP address on the WAN side of the NAT router, (not the local IP like 192.x.x.x or 10.x.x.x)

 

[silentfun]

TRy this in extensions Other options <<

Extension is external (enabled)
Bind to Media Server (enabled)
Supports Re-Invite (enabled)
Supports 'Replaces' header (enabled)

if you use more the one account on GXP-2000 don´t forget to reserve more ports

SIP UDP (5060,5061),(5062,5063) and so on
RTP for each line you want to use