Signaling protocol support

Session Initiation Protocol (SIP)

Codec support

G.711a/μ, G.722, G.729a, iLBC

Key call features support

+ Dialing (E.164)

Abbreviated dial

Adjustable ringing and volume levels

Adjustable display contrast

Agent greeting

Auto-answer

Auto-detection of headset (Not available on the IP Phone 7811)

Busy Lamp Field (BLF) (Not available on the IP Phone 7811)

Call back

Call forward

Call history

Call park

Call Pickup

Call timer

Call waiting

Caller ID

cBarge

Corporate directory

Conference

Cross Cluster Extension Mobility (EMCC)

Dial from the list

Direct transfer

Do not disturb

Extension Mobility (EM)

Forced access codes and client matter codes

Group call pickup

Hold/resume

Immediate divert

Intercom (Not available on the IP Phone 7811)

Join (Not available on the IP Phone 7811)

Message-waiting indicator

Meet me conference

Mobility

Music on hold

Mute

Network profiles (automatic)

On- and off-network distinctive ringing

Personal directory

Privacy

Private Line Automated Ringdown (PLAR)

Redial

Ring tone per line appearance

Shared line

Silent monitoring and recording

Speed dial

Time and date display

Transfer

Voicemail

Whisper coaching

Language support

Arabic (Arabic Area)

Bulgarian (Bulgaria)

Catalan (Spain)

Chinese (China)

Chinese (Hong Kong)

Chinese (Taiwan)

Croatian (Croatia)

Czech (Czech Republic)

Danish (Denmark)

Dutch (Netherlands)

English (United Kingdom)

Estonian (Estonia)

French (France)

Finnish (Finland)

German (Germany)

Greek (Greece)

Hebrew (Israel)

Hungarian (Hungary)

Italian (Italy)

Japanese (Japan)

Latvian (Latvia)

Lithuanian (Lithuania)

Korean (Korea Republic)

Norwegian (Norway)

Polish (Poland)

Portuguese (Portugal)

Portuguese (Brazil)

Romanian (Romania)

Russian (Russian Federation)

Spanish (Columbia)

Spanish (Spain)

Slovak (Slovakia)

Swedish (Sweden)

Serbian (Republic of Serbia)

Serbian (Republic of Montenegro)

Slovenian (Slovenia)

Thai (Thailand)

Turkish (Turkey)

Multiple ring tones

The phone supports user-adjustable ring tones.

Directories

The phone identifies incoming messages and categorizes them for users on the screen.

This makes it fast and easy to return calls using direct dial-back capability. The corporate

directory integrates with the Lightweight Directory Access Protocol (LDAP) standard directory.

Quality-of-service (QoS) options

The phone supports CDP and 802.1Q/p standards, and can be configured with an

801.1Q VLAN header containing the VLAN ID overrides configured by the Admin VLAN ID.

Security

Certificates

Image authentication

Device authentication

File authentication

Signaling authentication

Media encryption using Secure Real-Time Transfer Protocol (SRTP) using AES-128

Signaling encryption using Transport Layer Security (TLS) Protocol using AES-128 or AES-256

Encrypted configuration files

802.1X authentication

Cryptography

Configuration options

The user can configure IP address assignment statically or through the DHCP client.

Physical dimensions (H×W×D)

IP Phone 7821: 207 x 206 x 28mm (exclude foot stand)

Weight

IP Phone 7821: 867g

Display

IP Phone 7821: 3.5” 396×162 pixels

Ethernet switch

The phone has a 10/100BASE-T or a 10/100/1000BASE-T 

Phone casing composition

Polycarbonate acrylonitrile butadiene styrene (ABS) textured plastic.

Power requirements

The phone is an interoperable IEEE 802.3af PoE (Class 1 device); 48 VDC is required;

it can be supplied locally at the desktop using an optional AC-to-DC power supply (CP-PWR-CUBE-3=).

Use of the power supply also requires the use of one of the corresponding AC country cords.

Operational temperature

32 to 104°F (0 to 40°C)

Nonoperational temperature shock

14 to 140°F (-10 to 60°C)

Humidity

Operating 10% to 90%, non-condensing

Non-operating 10% to 95%, non-condensing

Cosmetic

Cisco cosmetic class A

Certification and compliance

Regulatory Compliance

CE Markings per directives 2004/108/EC and 2006/95/EC

Safety

UL 60950 Second Edition

CAN/CSA-C22.2 No. 60950 Second Edition

EN 60950 Second Edition (including A11 & A12)

IEC 60950 Second Edition (including A11 & A12)

AS/NZS 60950

GB4943

EMC - Emissions

47CFR Part 15 (CFR 47) Class B

AS/NZS CISPR22 Class B

CISPR22: 2005 w/Amendment 1: 2005 Class B

EN55022: 2006 w/Amendment 1: 2007 Class B

ICES003 Class B

VCCI Class B

EN61000-3-2

EN61000-3-3

KN22 Class B

EMC - Immunity

EN55024

CISPR24

EN60601-1-2

KN24

Armadillo Light

Telecom

FCC Part 68 HAC

CS-03-HAC

AS/ACIF S004

AS/ACIF S040

NZ PTC 220

Industry Standards: TIA 810 and TIA 920

Industry Standards: IEEE 802.3 Ethernet, IEEE 802.3af and 802.3at