Chinese/Asian radio "MDC1200"
Modern asian and chinese radios will likely have a roger tone setting available with some radtels and baofengs having and option called "TONE1200" and this is supposed to make your radio's transmit something that sounds like old analog police radio networks but most radios will fail to do that. Instead the roger tone or packet that is transmitting sounds more like something out of an MPT1327 System or the old motorola astro mdc1200 that sounds more similar. As its different to the modern mdc1200.
FrequenciesFrequencies
136-470 mhz (most dualbanders out of china come with that frequency standard)
Decoding SoftwareDecoding Software
High Speed Sound Modem https://uz7.ho.ua/packetradio.htm
Video ExamplesVideo Examples
https://www.youtube.com/shorts/Jc7LzzzXLLM (not exact signalling method but its similar)
Additional LinksAdditional Links
https://en.wikipedia.org/wiki/MPT-1327 (MPT1327 systems will send similar FFSKFast Frequency-Shift Keying packets at the end of individual transmissions like terminate link or establish link)