Yealink SIP-T21P User Manual

Customizing Your Phone
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2. Enter the desired interval in the Phone Lock Time Out (0~3600s) field.
3. Click Confirm to accept the change.
Note
To unlock the keypad, you must know the keypad unlock PIN of the phone. The default
keypad unlock PIN is “123”.
To change the keypad unlock PIN via phone user interface:
1. Press Menu->Settings->Basic Setting->Phone Unlock PIN.
2. Enter the current PIN in the Current PIN field.
3. Enter the new PIN in the New PIN field.
4. Enter the new PIN again in the Confirm PIN field.
5. Press the Save soft key to accept the change or the Back soft key to cancel.
Note
The default interval is 0 second, that is, you can long press to lock the keypad only.
The interval of automatic keypad lock is configurable via web user interface only.
The unlock PIN length must be within 15 characters.

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