Yealink SIP-T21P User Manual

About This Guide
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Thank you for choosing the SIP-T21P IP phone, exquisitely designed to provide business
telephony features, such as Call Hold, Call Transfer, Busy Lamp Field, Multicast Paging
and Conference over an IP network.
This guide provides everything you need to quickly use your new phone. First, verify
with your system administrator that the IP network is ready for phone configuration. Also
be sure to read the Packaging Contents and Regulatory Notices sections in this guide
before you set up and use the SIP-T21P IP phone.
If this is your first time using the SIP-T21P IP phone, we recommend that you first refer to
the Quick Installation Guide and Quick Reference Guide , available online:
http://www.yealink.com/DocumentDownload.aspx?CateId=142&flag=142.
Note
This is the first edition based on firmware version 71. Topics provided in this guide
include:
 Chapter 1 Overview
 Chapter 2 Getting Started
 Chapter 3 Customizing Your Phone
 Chapter 4 Basic Call Features
 Chapter 5 Advanced Phone Features
Shared Line, Busy Lamp Field List, Network Directory and Network Call Log features are
hidden for IP phones in neutral version, which are designed for BroadWorks environment.
Please contact your system administrator for more information.

Yealink SIP-T21P Specifications

General

Display	132 x 64-pixel graphical LCD
Network	10/100 Mbps Ethernet
SIP Accounts	2
Wall Mountable	Yes
Audio Features	HD Voice
Protocols	SIP v1 (RFC2543), v2 (RFC3261)
Voice Codecs	G.711(A/μ), G.729AB, G.726, G.722
Phonebook	1000 entries
Call Features	Call hold, call waiting, call transfer, call forward, 3-way conferencing
Security	SRTP, TLS, 802.1x, HTTPS
Ethernet Ports	2 x RJ45 10/100 Mbps
Power Supply	Power over Ethernet (PoE) or optional power adapter
Operating Humidity	10% to 90% (non-condensing)
Languages	Supports multiple languages
PoE	Yes (802.3af)
Operating Temperature	-10°C to 50°C