- Product Description: Cisco IP Phone 8851 - VoIP phone - Product Type: VoIP phone - Compatible Platforms: Cisco Business Edition 6000 - 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 - Lines Supported: 5 lines - Intercom: Yes - Speakerphone: Yes ( digital duplex ) - Call Services: Voice Mail, Caller ID, Call Waiting, Call Forwarding, Call Transfer, Call Hold, Message Waiting Capability - Display: LCD display - colour - 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, Cisco Unified Communications Manager Express 10.0 or later - Manufacturer Warranty: 1 year warranty