Detail overview
   Cisco Cp-7821-k9 7821 Voip Phone - Ip Phone -2 Line With B/w Screen. 
 Key Features : 
  Product Type : Voip Phone 
   Main Features : Multiple Voip Protocol Support, Integrated Ethernet Switch 
   Voip Protocols : Sip, Srtp 
   Voice Codecs : G.722, G.729ab, G.711u, G.711a, Ilbc 
   Lines Supported : 2 Lines 
   Speakerphone : Yes ( Digital Duplex ) 
   Call Services : Voice Mail, Caller Id, Call Waiting, Call Forwarding, Call Transfer, Call Hold, Message Waiting Capability 
   Display : Lcd Display - Monochrome - Yes 
   Network Ports Qty : 2 X Ethernet 10base-t/100base-tx 
   Compatible Software : Cisco Unified Communications Manager 8.5.1 Or Later