Yealink SIP-T21P User Manual

User Guide for the SIP-T21P IP Phone
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3. Enter the refresh period of corporate directory in the Search Flash Time (Seconds)
field.
The default value is 21600 seconds.
4. Click Confirm to accept the change.
The SIP-T21P IP phone maintains call history lists of Placed Calls, Received Calls, Missed
Calls and Forwarded Calls. Call history lists support 100 entries in all. You can view the
call history, place a call, add a contact or delete an entry from the call history list. You
should enable history record in advance.
To enable history record via phone user interface:
1. Press Menu->Features->History Setting.
2. Press or , or the Switch soft key to select Enable from the History Record
field.
3. Press the Save soft key to accept the change or the Back soft key to cancel.
To view the call history:
1. Press the History soft key.
The LCD screen displays All Calls list.
2. Press or to switch between All Calls, Placed Calls, Received Calls, Missed
Calls and Forwarded.
3. Press or to select the desired entry.

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