[supercoe]

Flashed the stock rom - same issue. Can someone else test this on their diamond?

1) Plug in the headset that came with the unit
2) Call a number that someone will be quiet (or just call your land line)
3) Turn the volume all the way up on the diamond so the hissing is apparent
4) During the call dial a single number on the keypad

Does the hissing go away for a couple seconds after the tone then return?

Thanks