comlit

I Have replacent My intercom Comlit Okay With Widex Everythimg works except they cant hear me down on the street

Hi, My girlfriend has moved into a flat and she can talk down to the front door but she can't hear anything back, the door unlock button works fine. We asked neighbors if there handsets were working and they said all fine. I thought it might be a faulty speaker and that I could just replace the...