Other: Where can I get headset adapter 4 to 5 pin cables

The standard for Clear-Com beltpacks and panels is a 4 pin mono connection with a male 4-pin XLR connector at the panel.
The standard for camera operators and Telex panels is a 5 pin stereo connection with a female 5-pin XLR connector on the camera.
It is simple enough to produce an adapter; simply wire pins 4 + 5 together onto pin 4, but it's often useful to be able to source ready-made, tested cables.
One source in the US which has a good reputation is : http://jimirayo.pairserver.com/