Cisco 7821 FeaturesHigh-resolution backlit display (3.5", 396 x 162 pixels)2 programmable line/feature keys4-soft keys2-way navigation and select keysSupports wideband audioHeadset portElectronic hookswitch can be controlled through auxiliary portFixed features include service, messaging, directory, hold/resume, transfer, and conferenceDual position footstand, wall mountablePowered by 802.3af Power over Ethernet, optional PoE injector, or optional Cisco power cube (sold separately; see drop down option above)10/100BASE-T Ethernet connection with PC pass-through portSession Initiation Protocol (SIP)CompatibilityThe Cisco 7821 is compatible with Cisco Unified Communications Manater 8.5.1, 8.6.2, 9.1.2, and 10.x and laterAlso compatible with Cisco Business Edition 6000 8.6.2 and later amd Cisco Hosted Collaboration Solution 8.6.2 and laterIncludesCisco 7821Handset and handset cordDesk baseNetwork cable