I have had a Linksys PAP2T connected to XNet (With Orcon as my ISP) for 3.5 years and been very happy with them. I recently changed over to Orcon Genius which basically changes the home line over to a VoIP line, but using their Orcon Labeled VoIP modem, and the XNet VoIP no longer works correctly.
The XNet lines no longer receives incoming calls, and if I call out I can hear the call recipient, but they cannot hear me and then the line goes dead after a few seconds.
A very helpful person from XNet suggested this might be a firewall issue, so I set up the PAP2T (to XNet) with a static IP address and forwarded all the required ports, but with the same failures. Just in case I stuck the PAP2T in the DMZ, and it still fails.
It appears the Orcon modem, or possibly their servers are interfering in some way. as far as I know there should be no problems with a second VoIP device, and the Orcon FAQ says that other VoIP products should work.
Any suggestions would be most welcome,