Aastra Dialog 4187 Analog Telephone for MX-ONE, user guide - Page 15
Cancel any single Callback, Cancel all Callbacks, Dial the external number and press.
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Outgoing Calls 6 z# d u If all external lines are busy (after dialing the digit or digits to get a line): Press. 5 Note: France, Finland and Sweden, press Dial the external number and press. Replace the handset to finish procedure. When an external line becomes free, you will be called back (recall ring signal). You have to answer within eight seconds, otherwise the Callback service is cancelled. Lift the handset when you are called back. The system calls the external number. Note: Only one Callback can be activated on a busy external line. u #37* z #d Cancel any single Callback Lift the handset. Dial and enter the extension number. Note: To cancel a single Callback on a specific external line, dial the digit or digits to get a line instead of the extension number. Press and replace the handset. u #37# d Cancel all Callbacks Lift the handset. Dial. Replace the handset. Analog Telephone 15