Quote Originally Posted by chpalmer View Post
Are you saying the provider system refuses to recognize NAT? Or that your ATA is unable to be set to recognize its behind NAT??
For those calls, there is no "provider." For example, I can forward an IPKall number or Gizmo5 directly to my adapter without the need to register that adapter to a particular provider or to use a SIP proxy. Or I can call from one adapter directly to another adapter across the internet without using a provider. Also, the adapter can register to one provider (e.g., VOIPo) but still receive incoming calls directly from IPKall or G5 or another adapter. Some adapters and soft phones have a specific setting to support receiving calls without registering, whereas others don't. My point is that port forwarding is necessary to receive calls that go directly to the adapter.

I have two PAP2 adapters (one for VOIPo and one for NextAlarm), plus two old AzaCall/UTStarcom adapters from Lingo. I also sometimes use an XLite soft phone. Most of this is just for fooling around.