I can receive rings and I can ring others. Once I accept the call or others accept my call, then no voice from either side I can see timer working.

It use to work. Looks like this problem is specific to my account. Even after re-flash to 2008 OS the problem exists. Could be a conflict some where.

Once I tried Gizmo to call Google account, which failed. I guess this problem could be after this scenario. No idea.

Any suggestion?

Many thanks in advance.