NEC XN120 Feature Manual page 183

Tandem Trunking (Unsupervised Conference)
n Description
Tandem Trunking allows an extension user to join two or more 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 at any time.
The number of 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 in the above
table.
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 at any time.
There are two methods for Enhanced Tandem Trunking:
·
Method A - Set Up Without Transfer Key
An extension user can set up Tandem Trunking (Unsupervised Conference) by using the CONF
key. This option uses a uniquely programmed Transfer key to set up a tandem call.
·
Method B - Tandem Trunking on Hang Up
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.
Conditions
A) Tandem Trunking requires analogue loop start trunks with disconnect supervision or ISDN
trunks.
B) The maximum number of trunk-to-trunk conferences allowed is determined by the
Conference feature setup. See Programming below.
Default Setting
Disabled.
n Programming
Tandem Trunking Method A - Tandem Trunking from Conference
Ø 10-07-01 : Conversation Record Circuits
Ø 14-01-04 : Basic Trunk Data Setup - Transmit Gain Level for Conference and Transfer Calls
Ø 14-01-05 : Basic Trunk Data Setup - Receive Gain Level for Conference and Transfer Calls
Ø 14-01-13 : Basic Trunk Data Setup - Loop Supervision
Ø 15-07-01 : Programming Function Keys
Ø 20-06-01 : Class of Service for Extensions
Ø 20-13-08 : Class of Service Options (Supplementary Service) - Conference
Ø 20-13-10 : Class of Service Options (Supplementary Service) - Barge In Mode
Ø 20-11-14 : Class of Service Options (Hold/Transfer Service) - Trunk-to-Trunk Transfer
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Features
Features Manual