NEC Univerge SV8100 Features And Specifications Manual page 494

Issue 12.0
Program 20-28-02: No Setting

Program 20-28-03: 180

Program 24-02-07: 600 (Used only with manually transferred Tandem Trunk calls)

Program 24-02-10: 30 (Used only with manually transferred Tandem Trunk calls)

Program 25-07-07: 600 (Used only with automatically transferred Tandem Trunk calls or DISA

calls)
Program 25-07-08: 30 (Used only with automatically transferred Tandem Trunk calls or DISA calls)

1. An external call connects to an external number (either by transferring with Tandem Trunking or by DISA
caller).
2. After 10 minutes (Tandem Trunking = Program 24-02-07 or DISA = Program 25-07-07), a warning tone
is heard and the user dials
3. After three minutes (Program 20-28-03), the warning tone is heard again. After 30 seconds (Tandem
Trunking = Program 24-02-10 or DISA = Program 25-07-08), the call is disconnected.
Conditions
The DISA caller must use an analog (DTMF) telephone. DISA is compatible with calling

devices that meet the DTMF signaling requirements of EIA Specification RS-464. DISA
trunks must be ground start or supervised loop start.
The Continue/Disconnect code must be DTMF.

With an analog trunk, the Continue/Disconnect code may work using DTMF sounds from

the opposite side trunk. With an ISDN trunk, Program 14-01-25 must be enabled to detect
the Continue/Disconnect code.
The Continue/Disconnect code is not accepted while dialing a trunk.

Continue/Disconnect codes do not work if all DTMF receivers are busy.

When used with the Networking feature, both systems must be programmed the same.

In a system with ARS enabled:

When a DISA caller dials 9 for an outside call (if allowed), the system routes the call via
ARS.
In a system with ARS disabled:

When a DISA caller dials 9 for an outside call (if allowed), the system uses the routes
programmed for Trunk Group Routing.
Transferred calls on DISA, DID, DIL, ISDN trunks, or from the VRS can display the reason

a call is being transferred (Call Forward, Busy, No Answer or DND).
Long conversation cutoff is controlled separately for manually transferred Tandem Trunk

calls, automatically transferred Tandem Trunk calls, and DISA calls.
Tandem Trunking also uses the Continue/Disconnect codes DISA uses.

2 - 464
(Program 20-28-01) to extend the conversation.
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UNIVERGE SV8100
Direct Inward System Access (DISA)