NEC ELECTRA ELITE IPK II, User Manual

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Electra Elite IPK II Document Revision 4C
Tandem Trunking (Unsupervised Conference) 2 - 953
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. In addition, 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 CPUII provides two blocks of 32 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 32.
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 2-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
by hanging up the telephone.