The Aiphone JP-TLI is a telephone interface unit for the JP Series. 12 VDC power source supplied. Voice synthesis for the door station. RJ11 wiring for the station and telephone line with adapter plug. Outlet contact activated by the master monitor station. Programming through DTMF-type station. Call on internal telephone station (without communication costs). Forwarding to external number or GSM (with communication cost). Double call beep of the door station to the telephone during communication. ompatible with JP-4MED. takes the place of a substation and counts in the system capacity.