The following codes can be used to activate and deactivate various features on your phone or ATA
Call forward all activate: **72
Call forward all deactivate: **73
Call forward busy activate: **72
Call forward busy deactivate: **73
Call forward no answer activate: **92
Call forward no answer deactivate: **93
Call waiting activate: **56
Call waiting deactivate: **57
Do not disturb activate: **78