OK, I am “borrowing” what telcodog and ucxguy put , along with my comments, and condensing it all right here:
From the WIKI: Port Forwarding for Remote Nortel Phones
In order to allow remote workers with Nortel IP phones (with UNISTIM firmware) to access your UCx system from the public network, you should configure your router to forward the following ports to the IP address of your UCx Server (by default 192.168.1.200):
Rule Name Port Number/Port Range Port Type
UNISTIM (signaling) 7000 UDP
RTP (media) 10000-13999 UDP
If you use a non-default port number for UNISTIM signaling (PBX - PBX Configuration - Nortel Settings - Port), use the actual port number for the first rule in the table above.
1. In the UCx under Nortel settings, you have to put your router's external IP into the Public IP box or else you will have no audio.
2. The remote IP phone must be configured to connect to the public IP address of the UCx system - that is the public address of the router on the UCx end.
3. The router on the client side does not require any extra configuration to allow remote IP sets to operate - standard NAT implementation handles all that is needed.
4. I also configured my Router to forward Port 5060 so I can use soft phones with the system as well. This would be for using Bria Counterpath, CSIP, Zoiper, etc.
This works like a charm! We have remote sets from our operating UCx working with no issues and I also use the soft phone client on my cell phone as a registered extension on the UCx for demo purposes.
Stocking Distributor for E-Metrotel