Samsung iDCS500
BUSY LINE QUEUING WITH CALLBACK
If you receive a busy signal when you dial an external line:
1. Press Recall, listen for transfer tone and dial 44.
2. Hang up.
3. When the line becomes free, the system will call you back.
4. Lift the handset, listen for dial tone and dial the telephone number (or the
speed dial number) again.
Note: A callback will be cancelled if it is not answered within 30 seconds.
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SLT User Guide