It's out of the question. The traffic is quite expensive and I make much more calls than I receive. I'd rather forward incoming calls to my cell than switch to G.711.
I'm sure this behavior has something to do with the codecs and most likely your solution will work, but it's just not acceptable.
Seems like this issue has been around for a while:
http://forum.voxalot.com/voxalot-sup...onversion.html
I'm just wondering why it's not persistent, sometimes I do receive incoming calls...