NEC UNIVERGE SV9100 Features And Specifications page 1197

Software enhances the forced trunk release option with the Tandem Trunking and DISA features. Users
can use a Continue or Disconnect service code. The Continue service code extends the conversation a
programmed time. If the user enters the Disconnect service code, the call is disconnected immediately.
Example:
The following example indicates how a call is handled with the system programmed as follows:
Program 14-01-25: 1 (Continued/Discontinued Trunk-to-Trunk Conversation)
Program 20-28-01:
Program 20-28-02: No Setting (No Conversation Disconnect Code is entered)
Program 20-28-03: 180 (Conversation Continue Time)
Program 24-02-07: 600 (Only used with Trunk-to-Trunk Transfer Release Warning Tone)
Program 24-02-10: 30 (Only used with Disconnect Trunk-to-Trunk)
Program 25-07-07: 600 (Long Conversation Warning Tone Timer)
Program 25-07-08: 30 (Long Conversation Disconnect)
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
Tandem Trunking requires either loop start trunks with disconnect supervision or ground
start trunks.
The maximum number of simultaneous trunk-to-trunk conferences allowed is determined
by the Conference feature setup. Refer to the Guide to Feature Programming for this
feature.
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 receivers are busy.
When used with the Networking feature, both systems must be programmed the same for
the Continue/Disconnect codes.
A trunk can be set up to automatically tandem trunk/forward to an outside telephone
number or Speed Dial – System/Group Dialing bin.
Other programmed options for incoming and outgoing calls can affect how calls are
handled. Refer to Central Office Calls, Answering/Central Office Calls, Placing and check or
program these options as needed.
DISA calls also use the same Continue/Disconnect codes.
After initiating an unsupervised conference, selecting one of the CAP keys or line keys
# (Conversation Continue Code)
# (Program 20-28-01) to extend the conversation.
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