Ericsson DT59C - Manual (Page 38)

Outgoing Calls
DT590 38
If all external lines are busy when the Yes key is pressed after
dialing the external number: 6#
Press.
Note: France, Finland and Sweden, press
5#
. Ъ Щ
Press to finish the 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. While waiting for the Callback, you
can make and receive calls as usual. Ь Ы
Press when you are called back.
The system calls the external number.
Note: Only one Callback can be activated on a busy
external line.
Cancel any single Callback
#37* ¿
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. # Ь Ы
Press.
Wait for the call timer to start in the display. Ъ Щ
Press to finish the procedure.
Cancel all Callbacks
#37#
Dial. Ь Ы
Press.
Wait for the call timer to start in the display. Ъ Щ
Press to finish the procedure.