Cisco Ip Phone Hardware; Cisco Ip Phone Hardware Overview - Cisco 7821 Administration Manual

Cisco IP Phone Hardware

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Cisco IP Phone Hardware Overview

The Cisco IP Phone 7821, 7841, and 7861 provides voice communication over an Internet Protocol (IP)
network. The Cisco IP Phone functions much like a digital business phone, allowing you to place and receive
phone calls and to access features such as mute, hold, transfer, speed dial, call forward, and more. In addition,
because the phone connects to your data network, it offers enhanced IP telephony features, including access
to network information and services, and customizable features and services.
The Cisco IP Phones have the following features:
• Programmable feature buttons that support up to 16 lines (Cisco IP Phone 7821 supports 2 lines, Cisco
• Gigabit ethernet connectivity (This is applicable only to Cisco IP Phone 7841)
• Support for an external microphone and speakers
A Cisco IP Phone, like other network devices, must be configured and managed. These phones encode G.711
a-law, G.711 mu-law, G.722, G.729a, G.729ab, and iLBC codecs, and decode G.711 a-law, G.711 mu-law,
G.722, G.729, G.729a, G.729b, G.729ab, and iLBC codecs.
Using a cell, mobile, or GSM phone, or two-way radio in close proximity to a Cisco IP Phone might cause
Caution
interference. For more information, see the manufacturer's documentation of the interfering device.
Cisco IP Phone Hardware Overview, page 17
Cisco IP Phone 7821, page 18
Cisco IP Phone 7841, page 22
Cisco IP Phone 7861, page 26
Terminology Differences, page 29
IP Phone 7841 supports 4 lines and Cisco IP phone 7861 supports 16 lines) or that can be programmed
for other features
Cisco IP Phone 7821, 7841, and 7861 Administration Guide for Cisco Unified Communications Manager 10.0 (SIP)
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