Detail overview CISCO - Ip Phone 8851 - Voip Phone (CP-8851-K9). Key Features : Product Type : Voip Phone Main Features : Multiple Voip Protocol Support, Integrated Ethernet Switch Voip Protocols : Sip, Rtcp, Rtp, Srtp, Sdp Voice Codecs : G.722, G.729a, G.711u, G.711a, Ilbc, Isac Intercom : Yes Speakerphone : Yes ( Digital Duplex ) Call Services : Voice Mail, Caller Id, Call Waiting, Call Transfer, Call Hold, Message Waiting Capability Display : Lcd Display - Color - Yes Network Ports Qty : 2 X Ethernet 10base-t/100base-tx/1000base-t Compatible Software : CISCO Unified Communications Manager 8.5.1 Or Later, CISCO Hosted Collaboration Solution Condition : New Factory Sealed. availability : In Stock. our Warranty : 30 Days.