I have a nice Talkswitch voip system. Per the Talkswitch specs, ports 5060 / UDP, 6000 – 6006 / UDP, 69 / UDP, 8484 / TCP, 9393 / TCP are all mapped to the Talkswitch unit. It has built in voip router connectivty tests which it passes.
At the remote location, I have a Talkswitch voip phone, model TS-350i behind a linksys nat firewall. I configured the Talkswitch pbx with the phone's mac address and the phone with the public ip address of the switch.
The phone does some amount of comms with the switch and manages to learn its ext number and station name. But it doesn't fully register with the switch and calls don't work.
Questions: 1) The remote office is served by Time Warner roadrunner service. Do they block voip ports? What is the recommended way to test?
2) The Talkswitch support tells me that the phone goes through a nat firewall with no adjustments needed on the firewall. Does that make sense? I thought I'd need to open up ports on the firewall, no?
Thanks.
Best Answer
Road Runner tends to block high ports. However, I was able to get my remote phone working by using Port Address Translating (similar to NAT, and frankly it's the same thing)...
On your remote network in your router settings, map each one of the ports Talkswitch specifies...
...to an unused outbound port below 1024 (UDP 69 does not need translating), then on your company router map those incoming ports back to the Talkswitch device on the correct port.
The phone system has no problem with this because to it, it's sending and receiving on the right port.
Horrible text graph below. If it doesn't make sense let me know and I'll do a graphical in the morning.