Aastra 6753 - Directory of Abbreviated Numbers; Programming a Personal Abbreviated Number; Erasing a Personal Abbreviated Number

During the call
20
Ending a call
To protect the call:
To protect the phone against any call or intrusion during data
transmission:
• Press successively the following keys:
R * 4 3 or .
-> An audible signal and the display indicate that the action has
been carried out. During this call, any attempt to call the phone
is ignored.
You can press
R1 to resume the call.
• Hang up your handset.
-> The line is free. The communication is terminated.
*
4 3