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The Reviews Say...
Try hovering over one of the vertical bars in the graph!
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Release Date
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Apr 2012
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Aug 2012
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Jan 2012
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Aug 2011
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Type
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IP Phone
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IP Phone
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IP Phone
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IP Phone
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Codec
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G.711a-law, G.711µ-law, G.722 (wideband), G.729a
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G.711a, G711u, G.729a
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G.711 (A-law and μ-law), G.729AB, G.722, G.722.1, G.722.1C
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G.711a, G.711u, G.726
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Protocol
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DHCP, HTTP, SNTP, DNS
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IP, TCP, TFTP, UDP, Cisco Discovery Protocol (CDP), DNS, HTTPS, SRTP
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FTP, TFTP, HTTP, HTTPS, SNTP, SIP, SDP
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SIP
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QoS
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DiffSer
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IEEE 802.1Q (VLAN), Differentiated Services (DiffServ), IEEE 802.1p, Type of Service (ToS)
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IEEE 802.1p/Q tagging (VLAN), Layer 3 TOS, and DSCP
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Supplementary Service
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Call Hold (H.450.4), Call Transfer (H.450.2), Call Waiting (H.450.6), Message Waiting Indication (H.450.7)
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Call Hold (H.450.4), Call Transfer (H.450.2), Call Waiting (H.450.6), Call Pick-up (H.450.5), Call Diversion (H.450.3)
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VoIP Signaling Protocol
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SIP
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SIP
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SIP
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Audio / Video Interfaces
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Headset/ Handset: RJ 22
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1 x RJ 9 (Headset/ Handset)
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Networking Connectivity
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1 x USB, 2 x Ethernet 10Base-T/100Base-TX/1000Base-T
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2 x Ethernet 10Base-T/100Base-TX
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2 x Ethernet 10Base-T/100Base-TX/1000Base-T
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Display Type
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Color LCD
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Monochrome LCD
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TFT
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Keyboard
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Touch-Screen
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Numeric Keypad
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Numeric Keypad
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Additional Features
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Speaker
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Built-in web server, Built-in clock, pager call, Speaker
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Local three-way audio conferencing, One-touch speed dial, redial, Remote missed call notification, Do not disturb function
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Speaker, Voice Mail
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Power Source
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Power over Ethernet
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Power over LAN / IEEE 802.3 af / PoE
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Power over LAN / IEEE 802.3 af / PoE
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Power over LAN / IEEE 802.3 af / PoE
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