I don't know if I'm blaming Callcentric unjustly, but here's the issue:
I just switched my sp1 to Callcentric free DID from ipkall/localphone since lp was dropping calls. Now CC seems to be working fine (not dropping calls), but today when I called a friend who has Cricket cell service (cdma and suspected voip for cell calls), after 3-4 minutes into the call, his voice went extremely tinny, almost like a whisper talking through a voice scrambler. He said he could hear me fine. I called back and the same thing. Called a 3rd time same thing (after a few minutes). Hung up and called someone else on a landline, no problems. Hung up and called back the original friend, but using GV this time, no problems. After about 30 mins, called back the same guy on CC again... and after a good start, 3.5 minutes in, the voice got crappy again. So, in this story, it happens when calling with Callcentric, and the other party on Cricket.
Any ideas?