DTMF - Brooklyn Park, Minnetonka, I think Burnsville, - I recall hearing at one time this was for in station alerting - such as turning on lights etc which made sense since the ones it was referring to was either a ft or duty crew staffing model
Brooklyn Park, Minnetonka and Saint Anthony use DTMF on the HFMAIN. Saint Louis Park uses it on their channel. Burnsville/Dakota County uses USDD Pheonix G2 automated fire dispatching via line-in (FT depts such as south metro and burnsville/eagan) with backup two-tone and the other depts use only two-tone.