Yealink SIP-T56A User Manual page 262

Smart Media Phone
User Guide for SIP-T56A
The default value is "10".
Tap to accept the change or
6.
Auto redial is configurable via web user interface at the path Features->General Information.
To use auto redial:
When the called party is busy, the touch screen prompts the following:
Tap OK to activate auto redial.
1.
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to cancel.