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Yealink SIP-T21P User Manual

Yealink SIP-T21P
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User Guide for the SIP-T21P IP Phone
52
Dependencies:
Type (Key Event)
Key Type (DND)
Usage:
When DND is in phone mode:
1. Press the DSS key to activate DND.
2. Press the DSS key again to deactivate DND.
When DND is in custom mode:
1. Press the DSS key to access the custom DND interface.
2. Activate or deactivate DND for one or all accounts.
Note
SMS
You can use this key feature to quick access the short message service. For more
information, refer to Short Message Service (SMS) on page 111.
Dependencies:
Type (Key Event)
Key Type (SMS)
Usage: Press the DSS key when the phone is idle to access the short message service.
Group Listening
You can use this key feature to activate the Speakerphone and Handset/Headset mode
at the same time. It is suitable for the group conversation which has more than one
person at one side. You are able to speak and listen through the handset/headset,
meanwhile the others nearby can only listen through the speaker.
Dependencies:
Type (Key Event)
Key Type (Group Listening)
Usage:
1. During a call, press the DSS key to activate the group listening mode.
You can then speak and listen through the handset/headset, other persons at your
side can listen through the speaker at the same time.
2. Press the DSS key again to deactivate the group listening mode.
Zero Touch
You can use this key feature to configure auto provision and network parameters quickly.
Dependencies:
Type (Key Event)
Key Type (Zero Touch)
Usage:
1. Press the DSS key to access the zero touch screen.
2. Press the Ok soft key in a few seconds.
When DND is activated, the incoming calls will be rejected automatically.

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Yealink SIP-T21P Specifications

General IconGeneral
Display132 x 64-pixel graphical LCD
Network10/100 Mbps Ethernet
SIP Accounts2
Wall MountableYes
Audio FeaturesHD Voice
ProtocolsSIP v1 (RFC2543), v2 (RFC3261)
Voice CodecsG.711(A/μ), G.729AB, G.726, G.722
Phonebook1000 entries
Call FeaturesCall hold, call waiting, call transfer, call forward, 3-way conferencing
SecuritySRTP, TLS, 802.1x, HTTPS
Ethernet Ports2 x RJ45 10/100 Mbps
Power SupplyPower over Ethernet (PoE) or optional power adapter
Operating Humidity10% to 90% (non-condensing)
LanguagesSupports multiple languages
PoEYes (802.3af)
Operating Temperature-10°C to 50°C

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