SIP protocol For consumer or family use 2*16 Characters LCD Ethernet ports: TWO* 10 Base-T Ethernet ports, HUB function Functions: Speaker, Redial, Speed dial, Mute, Abbreviation dial, Call duration display, Volume adjust, Call history list: Missed, Received and Dialed, Phonebook Support features: Caller ID display, Balance display, Call hold/ Retrieve 80 Missed, 80 Received and 80 Dialed calls 112 Phone numbers storage 180 x 160 x 92 mm (L x W x H)