Yealink SIP-T21P User Manual

Basic Call Features
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The SIP-T21P IP phone is designed to be easily used like a regular phone on a public
switched telephone network (PSTN). You can place calls, answer calls, transfer a call to
someone else, or conduct a conference call.
This chapter provides basic operating instructions for the SIP-T21P IP phone. Topics
include:
 Placing Calls
 Answering Calls
 Ending Calls
 Redialing Numbers
 Recent Call In Dialing
 Auto Answer
 Auto Redial
 Call Completion
 Call Return
 Call Mute
 Call Hold/Resume
 Do Not Disturb (DND)
 Call Forward
 Call Transfer
 Call Waiting
 Conference
 Call Park
 Call Pickup
 Anonymous Call
 Anonymous Call Rejection
If you require additional information or assistance with your new phone, contact your
system administrator.
You can place a call in three ways using your SIP-T21P IP phone:
 Using the handset

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