76Securityenabling and disabling1. Press Menu > Settings > Security > FDN.2. Select On or Off.For details on fixed dialing, see page 32.ResetResetting the phone1. Press Menu > Settings > Reset.2. Enter password > Master Reset.note: It will return configuration settings to default. Thedefault password is ‘1234’.Clearing the phone1. Press Menu > Settings > Reset.2. Enter password > Master Clear.note: It will change the setting as default and erase allpersonal data. The default password is ‘1234’.TTYThe teletypewriter (TTY) is a telecommunications devicethat allows people who are deaf or hard of hearing, or whohave speech or language disabilities, to communicate via atelephone.Setting teletypewriter1. Press Menu > Settings > TTY.2. Select Disable, TTY Full, TTY Talk or TTY Hear.• Disable: TTY mode is disabled.• TTY Full: User who cannot talk and hear, sends andreceives a text message.• TTY Talk: User who can talk but cannot hear, receive atext message and send voice message.• TTY Hear: User who can hear but cannot talk, sends a textmessage and receive voice message.