For the past 3 years I have been using Linksys PAP2T phone adapter behind RV082 router with UDP port forwarding without any problems, until recently I started getting fast busy on all outgoing calls. Called the provider (ViaTalk) and was told they have to change the proxy setting on their end which fixed fast busy, but introduced ONE WAY audio on all incoming calls, however outgoing calls don’t seem to have this problem. ViaTalk’s solution to one way audio was changing SCTP port from 5061 to 5081 in the phone adapter, but as it made NO difference they blamed it on my router (which was working fine for the past 3 years) and hung up.

I was able capture phone adapter traffic using my laptop (nic in promiscuous mode), but to see the whole picture I think I need to do another capture between the cable modem and the router, just not sure what to capture.

The capture I got from behind the router looks like this. (66.147.235.3) sip:MWI@bumblebee.vtnoc.net communicates with my PAP2T (192.168.20.240) via 5061 and 5060 once connection is established, 192.168.20.240 communicates with 209.244.30.233 IP (G.711). Src Port: 16412 (16412), Dst Port: 60858 (60858) As I put my laptop with wireshark between the router and a cable modem, I am assuming 192.168.20.240 will not show up in the capture and the only IPs I can configure a filter for are 209.244.30.233 & 66.147.235.3?

Also I am guessing I will see something in the conversation with 209.244.30.233 in front on the router that I don’t see behind?

Thank you for your help