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CORTELCO C58P Entry Level IP Phone (2 SIP) 4 DSS Support 2.0 (RFC3261) and correlative RFCs Support IAX2 Support 2 SIP lines Codec:G.711A/u, G.723.1 high/low,G.729 a/b, G.722.1,G.726 Support HD voice Soft keys programmable Hard function key reprogrammable SIP application:support call forward/transfer(blind/attended)/holding/waiting/3 way talking/conference/pickup/join call/redial and unredial/ Click to dial/secondary dialing automatically Support SRTP Support BLF Two 10/100 BaseT Ethernet Interface 128*48 FSTN graphic LCD Support Multi-line Support IAX2 line key Support Open VPN and L2TP 4 DSS keys PoE(optional) TR-069(optional) Features: Call Waiting : Yes Caller ID (CID) : Yes Conference Calling : Yes Headset Port : Yes LCD Backlit Display : Yes Power Supply Included : Yes Speakerphone : Yes Voicemail : YesDimensions (LxWxH) : 4 x 9 x 9 Weight : 2.5 lb. Country of Origin : China (provided by manufacturer, not verified) Warranty : 1 Year