Alcatel Alcatel OmniPCX Office 4018/4019 - Manual (Page 25)

Programming your telephone
25
6
6.12 Lock / unlock your telephone
6.13 Activating/deactivating 'forced headset' mode
'Forced headset' mode must be activated as soon as a headset is installed instead of the receiver;.
your telephone is
locked/unlocked
enter your personal code
Lock OK 2
6 5
3 ab c def
jkl mn o
activating/deactivating 'forced headset' mode
Settings OK My phone OK ForcedHead OK
On OR Off OK