| Product type | IP Phone |
| Product colour | Black |
| Handset type | Wired handset |
| Backlight keypad | Y |
| Device lock | Y |
| Wall mountable | Y |
| Mounting | Desk/Wall |
| Caller ID | Y |
| Call waiting | Y |
| Speed dialling | Y |
| Call hold | Y |
| Call forwarding | Y |
| Call pick up | Y |
| Call transfer | Y |
| Message-waiting indicator (MWI) | Y |
| Volume control | Digital |
| Touchscreen | N |
| Display diagonal | 12.7 cm (5") |
| Display resolution | 800 x 480 pixels |
| Speakerphone | Y |
| Microphone mute | Y |
| Voice codecs | G.711a,G.722,G.729A,iLBC |
| Ethernet LAN | Y |
| Wi-Fi | N |
| Bluetooth | Y |
| Bluetooth version | 3.0+HS |
| Supported network protocols | SIP, SPD, UDP, GARP, DNS, TFTP, HTTPS, VLAN, RTP, RTCP, PPDP |
| Quality of Service (QoS) support | Y |
| DHCP client | Y |
| Security algorithms | EAP-FAST,EAP-TLS,HTTPS,SIPS,SSH,SSL/TLS |
| Networking standards | IEEE 802.3ab,IEEE 802.3af,IEEE 802.3at,IEEE 802.3i,IEEE 802.3u |
| USB 2.0 ports quantity | 1 |
| Ethernet LAN (RJ-45) ports | 2 |
| RJ-9 ports quantity | 1 |
| DC-in jack | Y |
| Power over Ethernet (PoE) | Y |
| Operating temperature (T-T) | 0 - 40 °C |
| Operating relative humidity (H-H) | 10 - 90% |
| Storage relative humidity (H-H) | 10 - 95% |
| Storage temperature (T-T) | -10 - 60 °C |
| Width | 257.3 mm |
| Depth | 40 mm |
| Height | 229.1 mm |
| Weight | 1.19 kg |
| Number of handles included | 1 pc(s) |
| Description |
| Cisco 8851. Product type: IP Phone, Product colour: Black, Handset type: Wired handset. Volume control: Digital. Display diagonal: 12.7 cm (5"), Display resolution: 800 x 480 pixels. Voice codecs: G.711a,G.722,G.729A,iLBC. Bluetooth version: 3.0+HS, Supported network protocols: SIP, SPD, UDP, GARP, DNS, TFTP, HTTPS, VLAN, RTP, RTCP, PPDP, Security algorithms: EAP-FAST,EAP-TLS,HTTPS,SIPS,SSH,SSL/TLS |