Caller Can't Hear Me

Hi,

Strange problem. I have an Aastra 53i that worked fine in the office. I took it home and modified the server setting on the phone as needed in order to connect to our trixbox. I can call any extension as well as outside of our network and receive calls. The problem is that nobody can hear me on the phone. I can hear them just fine. It's as if the mute button were pressed but it's not.

Any suggestions?

Thanks