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The fixed keys facilitate access to predefined functions:
: long press: switch ON.
single press: off-hook.
: long press: switch OFF.
single press: on-hook, or quit programming mode.
: single press: transfer call to another extension.
long press: redial last number sent.
: single press: access personal directory.
long press: access "Call by name" function.
: long press: send DTMF codes (during call).
: long press: access mobile customisation.
: during call: adjust audio volume.
no call: lock or unlock keypad.
: long press: access local customisation menu.
: validate entry or initiate a call by name.
: scroll display screen pages.
: move up one line in a list, or erase last character entered.
: move down one line in a list, or enter a space.