Voip phone Voice signaling support sip simultaneous voip calls·+support sip v2 standard (rfc3261)·+register up to 4 server simultaneously support multiple dialing plan / call hunting group·+adaptive jitter buffer function·+support multiple dialing plan / call hunting group·+flexible routing table and profile·+extensible by external ivr/cdr/billing servers for value- added application Management web interface management·+support auto-provision system·+remotely configuration/upgrade by web ui or auto provision build in watching dog for auto recovery Call handing features call timer display call transfer, hold, forward, pickup·+local three-way conferencing·+one-touch speed dial for 6 keys missed call notification forward call (always/on busy/no answer) last call return redial·+call by ip address via dial pad voice message (extensible by external ivr) phone book directory (100 entries) ring melody selectable (voip/pstn/hold) customize melody·+time and date display Dimensions:34cmx24cmx9cm(packing with box) N.W.:1.8kgs g.W.:20kgs