Harris M7300 - Telephone Interconnect Calls

ECP-3406 page 46
Telephone Interconnect Calls
In order to connect to a telephone scan, your system must
be equipped with a Public Service Telephone Network
(PSTN) interface device of some type
You will receive specific instructions regarding disclosure
of the direct-dial-in capabilities of your telephone interface
system as they apply to your radio system utilization and
to your organization