Hardware features

Ergonomic design

● An easy-to-use interface that provides a traditional telephony-like user experience.

Graphical display

● 6821: White backlit, grayscale, 2.5-in. (6.4-cm) 240 x 120-pixel display.

● 6841 and 6851: White backlit, grayscale, 3.5-in. (9-cm) 396 x 162-pixel display.

● 6861: White backlit, grayscale, 3.2-in. (8.1-cm) 320 x 120-pixel display.

● 6871: 3.5-in.(9-cm) 480 x 272-pixel color display.

● Scrollable access to calling features and text-based XML applications.

Handset

● 6821: Supports a narrowband audio handset connected through an RJ-9 port.

● 6841 and 6851: Supports either a narrowband or a wideband audio handset connected through an RJ-9 port.

● 6861 and 6871: Supports a wideband audio handset connected through an RJ-9 port.

● All 6800 series handsets are Hearing-Aid-Compatible (HAC) and meet Federal Communications Commission (FCC) loudness requirements for the Americans with Disabilities Act (ADA). You can meet Section 508 loudness requirements by using industry-standard inline handset amplifiers such as Walker Equipment W-10 or CE-100 amplifiers. The dial pad on all 6800 series models is also ADA-compliant.

● The 6800 series handsets produce a magnetic field that attracts small metallic objects such as pins and staples. To avoid possible injuries, do not keep small metallic objects close to the handset.

Headset

● The 6800 series provides exceptional noise isolation when used with a Cisco 500 Series Headset.

● The analog headset jack is a wideband-capable RJ-9 audio port for the 6821, 6841, 6851, 6861 and 6871 models.

Backlit indicator

● 6821: Backlit line buttons and a message waiting indicator; uses icons on the LCD to indicate activation of the headset, mute, and select buttons.

● 6841 6851 and 6861: Backlit indicators on the audio path keys (handset, headset, and speakerphone), mute key, select key, line keys and message waiting.

Volume control

● A volume-control toggle provides easy decibel-level adjustments of the handset, monitor speaker, and ringer.

Full-duplex speakerphone

● A full-duplex speakerphone gives you flexibility in placing and receiving calls. For added security, the Audible Dual-Tone Multi-frequency (DTMF) tones are masked when the speakerphone mode is used.

Single-position foot stand

● The foot stand holds the phone in a single position, making the display easy to view and the buttons easy to use while sitting down. You can remove the foot stand for wall mounting. There are mounting holes located on the back of the phone.

Wall-mountable

● 6821: Can be mounted directly to the wall using woodscrews and anchors for drywall.

● 6841 6851 6861 and 6871: Can be wall-mounted using the optional 6800 Series wall-mount kit (sold separately).

Electronic hook switch

● 6851 6861 6871: Electronic hookswitch headset support via its auxiliary port.

USB

● 6871 has USB-A port on the back for Cisco headset support.

Keys

● The 6821, 6841, 6851, 6861 and 6871 have the following keys:

◦ Lines

◦ Softkeys

◦ Two-way navigation and select

◦ Service

◦ Standard keypads

◦ Volume control toggle

◦ Speakerphone, headset, and mute

◦ Other than the primary line assignment on the first line key, the other keys may be configured as user-customizable, or system administrator-customizable Programmable Line Keys (PLKs)

● Additionally, the 6841, 6851, 6861 and 6871 have:

◦ Hold/resume, transfer, and conference

◦ Messaging, Directory

Ethernet cables

● The 6821, 6841, 6851 and 6861 support the following Ethernet cables:

◦ Category 3, 5, 5e, and 6 for 10-Mbps cables with 4 pairs

◦ Category 5, 5e, and 6 for 100-Mbps cables with 4 pairs

● Additionally, the 6841, 6851 and 6871 support:

◦ Category 3, 5, 5e, and 6 for 1000-Mbps cables with 4 pairs

Power features

IEEE PoE

● The 6821 and 6851 support IEEE 802.3af PoE (Class 2); power consumption does not exceed 6.49W.

● The 6871 supports IEEE 802.3af PoE (Class 3); power consumption does not exceed 12.95W.

● The 6841 and 6861 support wall power only through an included, regional power adapter.

Power adapter with country clips

● 6800 Series regional power adapters are available for powering the 6821, 6841, 6851, 6861 and 6871 when used in non-PoE deployments.

Cisco power injector

● The 6851 and 6871 are compatible with the Cisco Unified IP Phone Power Injector (CP-PWR-INJ), and with the Cisco Aironet ^® Power Injector (AIR-PWRINJ5=).

Illuminated buttons

Off (dark)

Button is not configured

Green, steady

Configured correctly and is in the idle state

Red, steady

In use and has an active call on it or has a parked call

Amber, flashing

A configuration error has occurred for this button

Illuminated page buttons

Off (dark)

Page not in focus

Green, steady

Page in focus

Amber, flashing

Page not in focus, with one or more alerting or on-hold calls present on page

Hardware and power-saving features

Graphical display

Two 3.5-in (9-cm) grayscale backlit LCD displays, 160 x 270 resolution

Directory number and feature buttons

The module has 14 physical buttons (28 using page keys)

Page buttons

Use the 2 page buttons to access each page of 14 buttons and provide phone status

Power save mode

When the Cisco IP Phone 6851 is placed in power save mode, the 6800 KEM is also placed in power save mode. Pressing the select button while the phone and KEM are in power save mode will restart both the phone and the KEM

Audio

● Codecs: G.711 (A-law and m-law), G.722.2, G.722, G.729 (a, b, ab), ILBC, iSAC, OPUS

● DTMF: In-band, out-of-band (RFC 2833), and SIP INFO

● MOS Score Reporting (Telchemy)

Network

● MAC address (IEEE 802.3)

● SIP protocol support (RFC 3261 and companion RFCs)

● IPv4 (RFC 791)

● IPV6 (RFC 2460): System Interoperability Testing Required

● DNS: A record (RFC 1706), SRV record (RFC 2782)

● Dynamic Host Configuration Protocol (DHCP) (RFC 2131)

● Simple Network Time Protocol (SNTP) (RFC 2030)

● Network Address Translation (NAT) traversal, serial tunnel (STUN)

● User Datagram Protocol (UDP) and TCP

● Link Layer Discovery Protocol (LLDP)

● Cisco Discovery Protocol

● TR.69 provisioning: System Interoperability Testing Required

Security

● Certificates

● Image authentication

● File authentication

● 802.1X authentication

● Transport Layer Security (TLS)

● Media encryption via Secure Real-Time Transport Protocol (SRTP) with Advanced Encryption Standard (AES-128 or AES-256)

● Signaling encryption using TLS with AES-128 or AES-256

● Encrypted configuration files

● Digest authentication

● Password login

● HTTPs secure provisioning

● Encrypted HTTP data in plain HTTP transmissions

● Mandatory/Optional Secure call

Applications

● Cisco XML Services Interface (XSI)

● Cisco UC-One Presence

Call control and audio features

● Busy Lamp Field (BLF)

● Call back on busy

● Call blocking – anonymous and selective

● Call conferencing – hosted (N-party) ¹

● Call conferencing – local 3-way

● Call forwarding – unconditional, no answer, on busy

● Call hold

● Call pickup – selective and group ¹

● Call park and unpark ¹

● Call transfer – attended or blind

● Call waiting

● Caller ID name and number and outbound caller ID blocking

● Caller ID mapping for incoming calls

● Configurable dial/numbering plan support with inter-digit timers – per line

● Configurable supplementary services soft keys

● Distinctive ringing based on calling and called number

● Do not disturb

● Early Media and Preconditions (Cisco BroadWorks R23 feature support)

● Extension mobility/hot-desking ¹

● Group paging ¹

● Hoteling ¹

● Intercom ¹

● Individual volume setting per audio path (headset, handset, or speaker)

● Multicast paging

● Music on hold ¹

● Outbound caller ID blocking

● Visual Voice Message Waiting Indicator (VMWI)

^● Shared/bridge line appearance ¹

● Exective/Admin Assistant

● Supplementary services feature activation codes

Directory

● Local phonebook

● XML/Lightweight Directory Access Protocol (LDAP) remote directory

● Broadsoft directory

● Intelligent search

● Call history

● Reverse address lookup in all directories

Management

● Configuration: Browser, phone, auto-provision

● Auto-provision via TFTP, HTTP, or HTTPs for mass deployment

● Encrypted Content Encoding over HTTP

● Packet capture, Problem Reporting Tool (PRT) and upload of PRT

● Remote generation and upload of PRT data

Wi-Fi and Bluetooth

● Built-in dual band 2.4G and 5G Wi-Fi

● Wi-Fi standards 802.11a/b/g/n

● Wi-Fi security protocols: WEP, WPA-PSK, WPA2-PSK, EAP-FAST, PEAP-GTC, PEAP-MSCHAP2

● Will support Bluetooth headset in further release

Asterisk

Interoperability Tested – Release (11.x)

Broadsoft Broadworks

Interoperability Tested and Certified – Releases 19sp1, 20sp1, 21sp1, 22sp1

Broadcloud

Interoperability Tested and Certified

Centile

6821, 6861 and 6871: Support with Centile is road mapped

6841 and 6851: Interoperability Tested and Certified – Release Istra SP 9.2

Metaswitch

Interoperability Tested and Certified – Release 9.5

Interoperability Tested – Release 9.3 for 6821