The chart below shows the wiring for CC-300 and CC-400 headsets to 4-pin, 5-pin, 6-pin and 7-pin XLR connectors.
Note that for 7-pin XLR connectors pins 6 and 7 are left un-wired. These pins are logic PTTs for V-Series panels and
Freespeak II beltpacks equipped with 7-pin XLRs.
Attached below is the PDF for CC-300 / 400 series headsets.