Yealink SIP-T21P User Manual

User Guide for the SIP-T21P IP Phone
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2. Compose the new text message. You can press the abc soft key to change the input
mode.
3. Press the Send soft key after completing the content.
4. (Optional.) Press or , or the Switch soft key to select the desired account
from the From field.
5. Enter the number you want to send the message to in the To field.
6. Press the Send soft key to send the message or the Back soft key to cancel.
Sending a text message is configurable via web user interface at the path
Features>SMS.
To reply a text message:
1. Press Menu->Messages->Text Message->Inbox.
2. Select the desired message and press the Reply soft key.
3. Compose the new text message. You can press the abc soft key to change the input
mode.
4. Press the Send soft key after completing the content.
To delete a text message:
1. Press Menu->Messages->Text Message->Inbox (sentbox, Outbox or Draftbox).
2. Select the desired message and then press the Delete soft key.
3. Select Delete to delete the desired message.

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