1.15 Optional Device Features106 Feature Guide1.15.6 Direct Inward System Access (DISA)DescriptionDirect Inward System Access (DISA) allows outside callers to be connected to their desired PBXdestinations without the use of the operator. Callers can listen to a DISA outgoing message (OGM)instructing them as to which numbers to dial to be connected to the person or department they would liketo speak with. DISA can also give PBX users access to PBX features, such as making outside (CO) linecalls, when they are outside the office.This DISA OGM can guide callers and allow them to:• Call an extension by dialling the extension number.• Call another outside party via the outside (CO) lines of the PBX.• Access the desired extension simply by dialling a single-digit number (DISA Automated Attendant[AA] number) using DISA AA service.DISA OGMWhen a call arrives on a DISA line, callers will hear a DISA OGM or a short beep. When the DISA AA serviceis active, this DISA OGM will direct callers to dial the appropriate digit (DISA AA number) to be connectedto a specified destination. To access other PBX features, such as making intercom or outside (CO) line calls,the caller may dial the appropriate numbers while the DISA OGM is playing. An extension assigned as the operator or manager extension can record a DISA OGM ( 1.15.5 OutgoingMessage (OGM) for DISA/UCD).DISA AA ServiceDISA AA service allows a caller to dial a single-digit number (DISA AA number) and be connected to thedesired party automatically. The PBX can store up to 10 destinations that can be called by dialling a DISAAA number (0–9) for each DISA OGM ( DISA Built-in AA [501]). These destinations can be an extensionnumber ( Extension Number [009]), an extension group number ( Extension Group [600]), or the DISAAA number of a 3-level DISA OGM ( 3-level AA Assignment [540-549]). After or while listening to the DISA OGM or a short beep, the caller may dial a DISA AA number as directedby the DISA OGM (e.g., "Press 1 to speak to Sales. Press 2 to speak to Support."). Each DISA AA number directs the call to a preprogrammed location. Since DISA AA numbers are single digits, if the caller dials a second digit within a preprogrammed timeperiod ( DISA AA Wait Time [517]), DISA AA service will be bypassed because the PBX will assume thecaller is trying to access a specific feature.When the DISA AA service is used, Incoming Dial Mode must be set to "With AA" through systemprogramming ( DISA Incoming Call Dial Mode [500]). When "With AA" is selected, the PBX regards caller-dialled digits "0" through "9" as DISA AA numbers. If no destination is assigned to "9" or "0", the PBX regardsthe number (9/0)* as the Automatic Line Access number ( Automatic Line Access [121]) or Operator Callnumber.Note* For New Zealand, the Automatic Line Access number may be either 1 or 9.
