How To Reboot The Phone? - Yealink SIP-T21P User Manual

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4.
Select the desired value from the pull-down list of RTP Encryption (SRTP).
5.
Click Confirm to accept the change.
Note
SRTP is not available on all servers. Contact your system administrator for more
information.
SRTP is configurable via web user interface only.

How to reboot the phone?

To reboot the phone via web user interface:
1.
Click on Settings->Upgrade.
Troubleshooting
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