Yealink SIP-T20 - Manual (Page 112)

User Guide for the SIP-T20P/SIP-T20 IP Phone
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3. Enter the desired time (in seconds) in the Play Hold Tone Delay field.
4. Click Confirm to accept the change.
How to change the user password?
To change the user password via web user interface:
1. Click on Security->Password.
2. Select user from the pull-down list of User Type.
3. Enter the new user password in the New Password and Confirm Password fields.
4. Click Confirm to accept the change.
Note If logging in the web user interface of the phone with the user credential, you need to
enter the current user password in the Old Password field.
User password is configurable via web user interface only.