TV or music mute

TV or music mute
The hookswitches in many 1A2 phones have more contacts then are needed for the phone to work. For example, some designs interrupt both the tip-side and ring-side of the phone line. One is enough for normal phone operation.

Check the schematic and connect the contacts of a spare switch to a spare wire pair. Use the switch closure to activate a relay (you'll need a power source, too) to disconenct the speakers in a TV or stereo system when the handset is picked up.