Yealink SIP-T21P User Manual

User Guide for the SIP-T21P IP Phone
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3. Press the Ok soft key.
The LCD screen prompts “Resetting…Please Wait!”.
The LCD screen prompts “Welcom Initializing…please wait”.
The phone will be reset to factory sucessfully after startup.
Note
Reset of your phone may take a few minutes. Do not power off until the phone starts up
successfully.

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