We have a internet and phone company hosting our PBX for our IP Phones. The way it currently works is i configure the phone with specific ip including tftp ip that reaches out to the phone company for config and calls are routed through them. For some reason, users can dial out but noone can dial in to reach them. Now, i recently upgraded the router, I don't see how this could cause the issue because I have at least 30 routers in the flee that I upgraded that don't have this issue. The configs are identical and nothing is missing. This is a 2811 router, and 7940 ip phone. All equipment is identical across the board. We're using SIP protocal.
I have reached out to ISP and they said make sure the following ports are open on my ASA but the traffic isn't going through the ASA, I dont have asa at that site. these are the ports they wanted me to open on the ASA just so you can review.
Ports 5060 & 5061 UDP are used in both directions.
Ports 69 UDP, 53 UDP, 123 UDP and 9001 UDP are used for outbound requests.
Ports 10,000 - 20,000 UDP are used for inbound and outbound real-time voice traffic.
I have "no ip nat service sip udp port 5060" which should be on the router, if I delete this entry, in PBX site, I see the extensions unprovisioned. When I re-add the nat entry, It comes back up so this obviosly need to be here.
There is no VOIP configs at all on the router. This is the only router that's not working out of all 30 something. Called ISP phone company, they said everything looks normal. When I dial the ext. I get "The person at ext. is unavailable" FYI, DND is off, I have hard reset the phone to factory already. Any help? Ideas?