Does Anyone Have an Apple Airport Working Correctly with VOIPO?

[brabin]

I just got this working. The key for me was to first hook the GS from its LAN port directly to my laptop so I could get into the web interface at the 102. IP address and then turn on the setting to allow configuration over the WAN port (this is off by default). Then, when plugged in downstream of the router, I use the WAN port on the GS. Then, in the Airport Utility (v. 5, not the newest v. 6) I was able to find the device in the DHCP clients list, get its MAC address, and reserve a static IP address on my local network. I had to follow the complete restart procedure in the order modem->router->GS, then everything seems to be working fine. I have not had to do any port forwarding.

[djrobx]

Now that my issues with dropped incoming calls were resolved with a new ATA, I tried to go back to using my Airport router as the router (as opposed to the built-in SBG6580 router, which works fine with VOIPo but has longevity problems/stalling downloads after a period of uptime).

After switching to the Airport, I had issues with one-way calls. I could always hear callers but they couldn't always hear me. I had followed the prescribed port forwarding rules. I also tried putting the ATA in the DMZ. Same deal. It was very repeatable.

What solved it? Simply removing the port forward and DMZ! We determined that the Airport does SIP ALG and there is no way to disable it. My current working theory is that the forwarded ports confuses/bypasses the SIP ALG, so things actually work worse than if you had just let the router handle it. So far it's worked OK.