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Yealink T20P
A press TRAN button to put B on hold, then A can dial the third number C and press TRAN button to call out. A will turn to hold status, and the LCD will display as TransferredA will be disconnected from the call. B can talk to CA will be disconnected from the call. B can talk to CA press TRAN button to put B on hold, then A can dial the third number C and pr …
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