Partyline: Excessive crosstalk on partyline system

There many causes to excessive crosstalk on a PL system
Cause 1: High DC resistance in ground return.
Solution 1: Use heavier cable; add additional conductor(s) to ground return.
Cause 2: MULTI-CHANNEL cable pairs are not individually shielded.
Solution 2: Replace cable with individually shield pairs.
Cause 3: Headset cables are not wired properly or shielded properly.
Solution 3: Correct wiring. Use headsets with properly shielded wiring. Make sure the mic pair are individually shielded