Unfamiliar In-band Signalling on Rocklin PD Dispatch

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CopperWhopper67

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Whenever I go through Rocklin I tune to their Dispatch frequency and along with MDC1200 I sometimes hear what sounds like a two-tone signal on keyup and sometimes on de-key. I have heard something similar to it on CHP's Valley Division-wide UHF frequencies but I am not sure what it is. I have audio of the signal that will be attached below. Does anybody know what kind of signalling it is? Apologies if this was the wrong section to post this.

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gmclam

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I believe what you're hearing is a radio ID transmitted as DTMF. El Dorado Sheriff also has it as do many others.
 

dcr_inc

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Keying tone burst on the transmitter from the console.. The filter was not fast enough to clip it all before the TX came up
 
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