Issue 5.0 UNIVERGE SV8100
1 - 970 Tandem Trunking (Unsupervised Conference)
Method D - Automatic Tandem Trunking Setup to Speed Dial Number
This method allows an extension user to easily set up an Unsupervised Conference with a call
they have placed on Hold. A Class of Service option is available, which allows or denies an
extension user from automatically setting up a Conference/Tandem Trunking call after hanging
up the telephone.
Trunk Continue/Disconnect Codes Added
Software enhances the forced trunk release option with the Tandem Trunking and DISA features. Users
can be allowed to 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:
o Program 14-01-25: 1 (Continued/Discontinued Trunk-to-Trunk Conversation)
o Program 20-28-01: # (Conversation Continue Code)
o Program 20-28-02: No Setting (No Conversation Disconnect Code is entered)
o Program 20-28-03: 180 (Conversation Continue Time)
o Program 24-02-07: 600 (Only used with Trunk-to-Trunk Transfer Release Warning Tone)
o Program 24-02-10: 30 (Only used with Disconnect Trunk-to-Trunk)
o Program 25-07-07: 600 (Long Conversation Warning Tone Timer)
o 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 # (Program 20-28-01) to extend the conversation.
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 Programming section for this feature.
The Continue/Disconnect code must be DTMF.
With an analog trunk, the Continue/Disconnect code may work using DTMF sounds from
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