Yealink SIP-T28P - Manual (Page 95)

Basic Call Features
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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 configure call completion via phone user interface:
1. Press Menu->Features->Call Completion.
2. Press or , or the Switch soft key to select Enable from the Call Completion
field.
3. Press the Save soft key to accept the change or the Back soft key to cancel.
Call completion is configurable via web user interface at the path Features->General
Information.
To use call completion:
When the called party is busy, the following prompt will appear on the LCD screen of the
phone:
1. Press the OK soft key, the phone returns to the idle screen and call completion is
activated.