Partyline: How to build an in-line mic switch for a headset mic.
Buy a toggle or PTT in-line switch, which will lift pin 2 of the 4-pin XLR to the intercom's headset jack, will allow them to leave the talk latched and turn their mics on and off with unmolested camera shots.This will only work with a dynamic microphone. Do not allow phantom voltage to be sent to the headset jack from the camera head, panel or BP.See attached photo for an example.One could also short pins 1 to 2...or use a make before break switch.