Yup, MDC and DTMF are quite common.
Sadly tho we also have some interlopers who have used DVP/DES, now P25 and TRBO
Originally Posted by N9JIG
MDC is pretty common on GMRS these days. If you have certain radios (like the HT1250/1550, or CDM1250/1550) they can be programmed to display the raw or translated ID off the air.
You can also by standalone MDC decoders from Cimarron and others. There is even a free MDC Decoder software application.