NEC SL1100, Features And Specifications Manual

Page: 745 / 864

Tandem Trunking (Unsupervised
Conference)
Description
Tandem Trunking allows an extension user to join two outside callers in a Trunk-to-Trunk Conference.
The extension user can then drop out of the call, leaving the trunks in an Unsupervised Conference.
The extension user that established the conference is not part of the conversation. The conference
continues until either outside party hangs up. The extension user that set up the conference can end
the tandem call anytime.
The number of simultaneous conference calls is limited by the number of conference circuits in the
system. Due to this fact, the maximum number of conference calls cannot exceed the limits defined
below:
The CPU provides two blocks of 16 conference circuits, allowing each block to have any number of
conferences with any number of internal or external parties conferenced as long as the total number of
conference channels used does not exceed the block limit of 16.
Tandem Trunking could help an office manager, for example, put two outside sales people in touch.
The office manager could:
• Answer a call from one salesperson
• Place a call to the second salesperson
• Set up the Trunk-to-Trunk Conference
• Drop out of the call
The office manager could terminate the conference anytime.
There are four methods for Tandem Trunking:
• Method A - Tandem Trunking from Conference
An extension user can set up Tandem Trunking (Unsupervised Conference) by dialing a 3-digit
service code (
#8 ) or a uniquely programmed Transfer key.
• Method B - Tandem Trunking with Transfer Key
This method allows an extension user to easily set up an Unsupervised Conference with a call they
have placed on Hold. It uses a uniquely programmed Transfer key to set up a tandem call.
• Method C - Automatic Tandem Trunking on Hang Up
This method allows an extension user to easily set up an Unsupervised Conference without having
to place the conference call 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.
• 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.
ISSUE 2.0 SL1100
Features and Specifications Manual 1-733
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