Yealink SIP-T48G - Manual (Page 105)

Basic Call Features
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5. Tap the Save soft key to accept the change or to cancel.
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:
1. Tap the OK soft key to activate auto redial.
The touch screen prompts the following:
2. Wait for a period of time or tap the OK soft key to redial the phone number.
The phone will retry as many times as configured until the called party is idle.
You can use call completion to notify the caller who failed to reach a desired callee
when the callee becomes available to receive a call.
To enable call completion via phone user interface:
1. Tap ->Call Features->Call Completion.