Not really sure what happened exactly in your case but Motorola hasn't made a radio capable of MDC-600 in years. However, they'll do MDC-1200 just fine. Is that what you're using? They also haven't ever had ATIS in them either. I'm using MDC-1200 but i can't find the anwer for this problem, however...

KG4INW wrote:Neither one of those signaling protocols are available on any TRBO radio.

I had that signalling tone but with the old firmware, when i upgrade the firmware the tone was changed by another like this: http://www.w2sjw.com/sounds/MDC1200%20Preamble.mp3

escomm wrote:Not easily. Why do you want to downgrade?

Im looking for a special Signalling Tone like "MDC600" or "ATIS"

How can I make a Firmware Downgrade on MOTOTRBO's radios like XPR/DGP/DP?, and Where can I get older versions of Firmwares?