Yealink SIP-T21P User Manual

User Guide for the SIP-T21P IP Phone
4
Icon
Description
Keypad Lock
Received Calls
Placed Calls
Missed Calls
Recording box is full
A call cannot be recorded
Recording starts successfully
Recording cannot be started
Recording cannot be stopped
Line key LED
LED Status
Description
Solid green
The line is in conversation.
The line is seized.
Fast flashing green
The line receives an incoming call.
Slow flashing green
The call is placed on hold.
Off
The line is inactive.
Line key LED (configured as BLF key)
LED Status
Description
Solid green
The monitored user is busy.
Fast flashing green
The monitored user receives an incoming call.
Off
The monitored user is idle.
The monitored user does not exist.

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