GTE Automatic Electric Vintage Rotary Dial Telephone

Vintage black rotary dial desk telephone
GTE - Automatic Electric

Testing results from standard landline connected directly to a wall jack:
Calls can be made and received
Does not ring

There doesn't seem to be a volume control dial on the bottom, so I'm thinking this is a bedroom extension telephone. No sound so your sleep isn't distrubed.

Plastic dial rotates and returns smoothly