I'm guessing it isn't but would like some certainty.
I call this squeak up, turn on repeaters, Quiet channel selcal, send radio ID and emergency data etc.
A boatload of radios, all Ericsson-Harris-MaCom, (Tyco) and would like to eavesdrop on a Motorola system. See this squeak up data.
G-star is proprietary for Harris and Motorola made a lot of money from MDC so a tight lid on information here.I can use Multipsk with my scanner but two radios for one system is too messy.
Many thanks.