2020 info - the 'Call In' TG and the 'TAC' TGs are listed as the interops channels - which seems to indicate that these TGs can be programmed in radios from multiple agencies - but the other TGs cannot
the TGs are listed here in the RRDB - Commonwealth Of Massachusetts Interoperable Radio System (CoMIRS) Trunking System, Regional, Massachusetts - Scanner Frequencies
the TGs are listed here in the RRDB - Commonwealth Of Massachusetts Interoperable Radio System (CoMIRS) Trunking System, Regional, Massachusetts - Scanner Frequencies