Yealink SIP-T21 - Manual (Page 121)

Advanced Phone Features
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The LCD screen prompts “Delete Message?”.
4. Press the OK soft key to delete this message or the Cancel soft key to cancel.
You can also delete all text messages by pressing the Delete soft key and then select
Del All. For more information, refer to the above steps.
Note
You can leave voice mails for someone else on the SIP-T21P/SIP-T21 IP phone. You can
also listen to the voice mails stored in a centralized location. When receiving a new
voice mail, the phone will play a warning tone and the MESSAGE key LED will illuminate.
The LCD screen will display a prompt message and flashing icon.
Note
To leave a voice mail:
You can leave a voice mail for someone else when he/she is busy or inconvenient to
answer the call. Follow the voice prompt from the system server to leave a voice mail,
and then hang up.
You can also delete a specific message after retrieving by pressing the Delete soft key.
Voice mail is not available on all servers. Contact your system administrator for more
information.