Thanks. Yes, both are behind the same router. FWD behind the same router works, but Gizmo Project doesn't. Funny how things work (or don't work). I don't have anyone to help me test these things right now.
The exact problem when using Gizmo, when and if it does work, is the phone hooked to the Grandstream rings but no audio. No audio back the other way, either. To or from Gizmo. Or sometimes, there is such a racket one way it is unintelligible (sounds like music or a commercial LOL) and none the other.
