We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Charcoal Cisco IP Phone 8851 desk handset with colour screen and multiple line keys

Cisco Systems, Inc.

Cisco Systems, Inc. CP-8851NR-K9= VoIP phone

SKU CH-GNDS-NHQJP MPN CP-8851NR-K9=

VoIP desk phone supporting SIP, SRTP and five lines with integrated Ethernet switch

  • TypeAccessories
  • SpecificationsMain Features: Multiple VoIP protocol support, integrated Et
  • Supports five simultaneous lines for call handling
  • Wideband voice with G.722 and G.711 codecs
  • Secure media streams via SRTP protocol
  • Integrated Ethernet switch simplifies desk cabling

Cisco IP Phone 8851 VoIP handset

The Cisco IP Phone 8851 is a VoIP handset supporting five lines and multiple protocols including SIP, RTCP, RTP, SRTP and SDP. It handles voice codecs such as G.722, G.729a, G.711u, G.711a, iLBC and iSAC. An integrated Ethernet switch simplifies network cabling at the desk.

Suits offices needing five-line SIP endpoints

Teams requiring more than five concurrent lines or non-SIP signalling should consider other models. Buyers needing wireless connectivity or colour displays not listed here will need a different device. The charcoal finish is fixed and cannot be changed.

Highlights

  • Supports five simultaneous lines for call handling
  • Wideband voice with G.722 and G.711 codecs
  • Secure media streams via SRTP protocol
  • Integrated Ethernet switch simplifies desk cabling

Specifications

BrandCisco
ModelCP-8851NR-K9=
TypeAccessories
SpecificationsMain Features: Multiple VoIP protocol support, integrated Ethernet switch
VoIP: Yes
VoIP Protocols: SIP, RTCP, RTP, SRTP, SDP
Voice Codecs: G.722, G.729a, G.711u, G.711a, iLBC, iSAC
Lines Supported: 5 lines
Quality of Service: IEEE 802.1Q (VLAN), IEEE 802.1p
IP Address Assignment: DHCP, static
Security: IEEE 802.1X, TLS
Power Over Ethernet (PoE) Support: Yes
Network Protocols: IP, TFTP, UDP, Cisco Discovery Protocol (CDP), HTTP, DNS, HTTPS, SRTP, Link Layer Discovery Protocol - Media Endpoint Discovery (LLDP-MED), RTCP, RTP
Network Ports Qty: 2 x Ethernet 10Base-T / 100Base-TX / 1000
Shipping weight0.91 kg
Package size152 × 127 × 102 mm

Questions about this item

Does the CP-8851NR-K9= require a PoE switch or separate power adapter to operate?

The phone includes an integrated Ethernet switch and supports Power over Ethernet, so a PoE-enabled network port can supply both data and power without a separate adapter.

Will the 8851 register with my existing SIP proxy that only offers G.711u and G.729a codecs?

Yes, the handset supports G.711u and G.729a among its voice codecs, so it will negotiate a compatible codec with a proxy limited to those two options.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.