Okay problem 1 solved.

The hearing aid was interfering with the hand set itself. Even unplugged the 504 handset was causing a "whistle". Strange.

I replaced the handset with a handset from the Toshiba's we are replacing and the whistle is gone.

Weird how even unplugged it was causing problems.

Now to find the "computery" sound on the mobile extensions.

Last edited by Keep; 08/29/12 08:13 AM.