1.16 Optional Device FeaturesFeature Guide 1531.16.6 Direct Inward System Access (DISA)DescriptionAn outside caller can access specific PBX features as if the caller is an SLT extension user onthe PBX, when the incoming call destination is a DISA floating extension number assigned toeach DISA message. The caller can have direct access to features such as:• Placing an intercom call to an extension, operator or any floating extensions (e.g.,modem for remote system administration, an external pager for TAFAS).• Calling an outside party via the PBX.• Operating some PBX remote features (e.g., FWD)Outgoing Message (OGM)When a call arrives on a DISA line, a prerecorded DISA message will greet and guide thecaller.Any extension assigned as the manager can record outgoing messages (OGMs). ( 1.16.5Outgoing Message (OGM))DISA Intercept—No DialIf the caller fails to dial any digits within a preprogrammed time period (DISA 1st Dial Time forIntercept) ( DISA Intercept Time [211]) following the outgoing message (OGM), the call isredirected to the operator extension.DISA Built-in Automated Attendant Number (DISA AA Service)After listening to the outgoing message (OGM), the caller may dial a single digit (DISA AAnumber). The destination for each DISA AA number can be assigned for each message. It isalso possible to assign other DISA floating extension number as the destination (MultistepDISA AA Service).If the caller dials a second digit within a preprogrammed time period (DISA 2nd Dial Time forAA), the DISA AA service is not employed.DISA Security Mode and Available FeaturesIf the DISA AA service is not employed, the caller may access the PBX features by enteringthe feature numbers. To prevent others from accessing the PBX features, it is possible toassign DISA security ( DISA Security Mode [732]). The features available depend on thepreprogrammed DISA security mode as follows:
