7.3 [5-3-1] Voice Message—DISA SystemDirect Inward System Access (DISA) enables outside callers to access specific PBX features as if the callerwere using an SLT extension of the PBX.For more information on DISA, see "1.17.6 Direct Inward System Access (DISA)" in the Feature Guide.Option 1DISA Security—DISA Security ModeSelects the DISA security mode to prevent unauthorised access to the PBX. In Trunk or All Security mode, thecaller is required to override security by Walking COS or Verification Code Entry in order to enable the restrictedfeature temporarily.Value RangeNone: Intercom calls, TIE line calls, and trunk calls can be made.Trunk: Intercom calls and TIE line calls without PBX code can be made. TIE line calls with PBX code and trunkcalls are restricted.All: All calls are restricted.Maintenance Console Location7.3 [5-3-1] Voice Message—DISA SystemProgramming Manual ReferencesNoneFeature Guide References1.9.5 Walking COS1.9.6 Verification Code EntryDISA Security—Remote Walking COS through DISA without PIN (Optional SDCard Required)Enables registered caller ID numbers to be automatically recognised as PBX extensions when calling throughDISA, and to use the Walking COS features without entering a PIN.Value RangeDisable, Enable (Get DISA)Maintenance Console Location7.3 [5-3-1] Voice Message—DISA SystemProgramming Manual ReferencesNonePC Programming Manual 7317.3 [5-3-1] Voice Message—DISA System