You can attached two standard telephones to this controller and it will initiate a call when either phone goes off-hook. The telephone that goes off hook first will receive 2 seconds of dial tone. The other telephone will then begin ringing until answered (factory default programming). The "BUSY" LED will light on the controller when either telephone is off-hook and will turn off during the duration of a timer and/or when both device ports are on-hook. Note: Dial tone and/or ringing can be disabled. The controller can be set for 4 different ring cadences (tones).
The distance between phones can be up to 2.6 miles total.
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