PreferenceSpecifiers AutocapitalizationType None AutocorrectionType No DefaultValue IsSecure Key prefix_preference KeyboardType NumberPad Title Prefix Type PSTextFieldSpecifier DefaultValue Key substitute_+_by_00_preference Title Substitue + by 00 Type PSToggleSwitchSpecifier Type PSToggleSwitchSpecifier Title Enable RFC DTMF Key rfc_dtmf_preference DefaultValue Type PSToggleSwitchSpecifier Title Enable SIPINFO DTMF Key sipinfo_dtmf_preference DefaultValue