Panasonic KX-TDA0161 4-Port Doorphone Card DPH44-Port Doorphone Card (DPH4)Required to connect doorphones (KX-T30865, KX-T7775, KX-T7765) and video intercom systems (VL-GM201A and VL-GM301A)Supports up to 4 doorphones and door opener relaysMounts on the KX-TDA0190 (OPB3) cardUse with KX-TDA100, KX-T..