Thanks RonR and others for the tip. I had exactly same problem and the fix mentioned by RonR worked
Voice Services -> SP2 Service -> X_ServProvProfile : B
The ObiTalk configuration page is very well thought out and so easy to work with. But wonder how they forgot to update this value for
voip.ms. While I do not mind updating the configuration locally, it is overwhelming with so many fields. ObiTalk makes it all nice and effortless.
I will let
voip.ms know about this fix, so that they can update their wiki page with this instruction.
Thanks once again. RonR, you are simply awesome.