DISA - Direct Inward System Access

General

DISA permits external users to call in to a PBX and get access to some of its features.

The DISA feature can be accessed via different types of trunks.

Direct in dialing trunks
Private tie lines
Manual trunks

The dialing procedure for a DISA call is:

DISA number DT * FC * AUTH.CODE # DT Wanted number

DISA number DT * FC * AUTH.CODE * FC * ACO.CODE # DT Wanted number

Table 1. DISA dialing
DT	= Dial tone
FC	= Feature code
AUTH.CODE	= Authorization code
ACO.CODE	= Account code

The DISA user has the possibility to charge a call to an account code (tied to, for example, a particular project, department, or client), instead of charging the called DISA extension (which is default).

A DISA call requires a DTMF telephone instrument with a key pad providing pound (#) and star (*) keys.

After having completed a DISA call the user must hang up, before a new DISA call can be made.

Some MX-ONE features are not available when making a DISA call:

Features that are accessed by dialing a procedure, except for the account code procedure.
Any feature activated by suffix dialing.

For more information on DISA, see the directions for use for DISA.

DISA permits external users to call in to a PBX and get access to some of its features.

Prerequisites

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Execution

The execution is described using two examples.

The first example is when DID external lines or tie lines are used for DISA.

The second example is when manual external lines are used for DISA.

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