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Tandem Trunking (Unsupervised Conference)
546 ◆ Features Aspire Software Manual
There are two methods for Multiple Trunk Conferencing:
● Method A - Set Up Without Transfer Key
An extension user can set up Multiple Trunk Conference (Unsupervised Conference) by dial-
ing a two-digit service code (#8).
● Method B - Multiple Trunk Conference with Transfer Key
This method allows an extension user to easily set up an Unsupervised Conference using a
uniquely programmed Transfer key.
Note: This operation is different than when only connecting 2 outside callers - the call
can be on hold and, after calling the second party, the Transfer key can be pressed. With
more than 2 outside calls, the CONF key must be pressed in order to connect the callers.
Notes:
● Multiple Trunk Conference requires either loop start trunks with disconnect supervision or
ground start for analog trunks. ISDN does not have this limitation.
● Only trunk keys can be used for re-entering a Multiple Trunk Conference. Trunk Group keys
and Loop keys are not supported.
● The maximum number of simultaneous trunk-to-trunk conferences allowed is determined by
the Conference feature setup. See Programming below.
Conditions
(A.) Tandem Trunking requires either loop start trunks with disconnect supervision or ground start
trunks.
(B.) The maximum number of simultaneous trunk-to-trunk conferences allowed is determined by
the Conference feature setup. See Programming below.
(C.) The Continue/Disconnect code must be DTMF.
(D.) 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.
(E.) The Continue/Disconnect code is not accepted while dialing a trunk.
(F.) Continue/Disconnect codes will not work if all DTMF receivers are busy.
(G.) When used with the Networking feature, both systems must be programmed the same for the
Continue/Disconnect codes.
Default Setting
Disabled.
Programming
Tandem Trunking Method A - Tandem Trunking from Conference
➻ 10-07-01 : Conversation Record Circuits
The number of circuits assigned as Conversation Record circuits limits the number of avail-
able Conference circuits. Make sure there are circuits available for Conference.
➻ 11-12-57 : Service Code Setup (for Service Access) - Tandem Trunking/Unsupervised
Conference
If the default service code (#8) for Tandem Trunking is not acceptable, change the code as
required.
➻ 14-01-04 : Basic Trunk Data Setup - Transmit Gain Level for Conference and Transfer Calls
Select the CODEC gain type used by the trunk when it is part of an Unsupervised Conference.