Cisco 6921 Administration Guide

CHAPTER
1-1
Cisco Unified IP Phone 6921, 6941, 6945, and 6961 Administration Guide for Cisco Unified Communications Manager 8.6 (SCCP and SIP)
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1
An Overview of the Cisco Unified IP Phone
The Cisco Unified IP Phone 6921, 6941, 6945, and 6961 provide voice communication over an IP
network. The Cisco Unified 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 is connected to your data network, it offers enhanced IP
telephony features, including access to network information and services, and customizeable features
and services.
A Cisco Unified IP Phone, like other network devices, must be configured and managed. These
phones encode G.711a, G.711µ, G.729, G.729a, G.729ab, and iLBC codecs, and decode G.711a, G.711µ,
G.729, G.729a, G.729ab, and iLBC codecs. These phones encode and decode the codecs in similar
manner.
This chapter includes the following topics:
• Understanding the Cisco Unified IP Phone 6921, 6941, 6945, and 6961, page 1-2
• What Networking Protocols are Used?, page 1-9
• What Features are Supported on the Cisco Unified IP Phone 6921, 6941, 6945, and 6961?,
page 1-12
• Overview of Configuring and Installing Cisco Unified IP Phones, page 1-23
• Terminology Differences, page 1-29
Caution Using a cell, mobile, or GSM phone, or two-way radio in close proximity to a Cisco Unified IP Phone
may cause interference. For more information, refer to the manufacturer’s documentation of the
interfering device.

Cisco 6921 Specifications

General

Brand	Cisco
Model	6921
Category	IP Phone
Language	English