AASTRA 4425 IP Vision for BusinessPhone User Guide - Manual (Page 36)

Outgoing Calls
BusinessPhone – Dialog 4425 IP Vision 36
Cancel one specific Individual Abbreviated Number u
Lift the handset. #51*
Press. z #
Enter an Abbreviated Number between 0 and 9 and press.
Cancel all Individual Abbreviated Numbers u
Lift the handset. #51#
Press.
Verification tone.