NEC Univerge SV9100, General Description Manual

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Issue 2.0
2-82 Features
Tandem Trunking (Unsupervised Conference)
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. The maximum number of conference calls cannot exceed the
limits defined below:
The GCD-CP10 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 32.
Tandem Trunking could help an office manager 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.
Four methods for Tandem Trunking are available:

Method A – Tandem Trunking from Conference

Method B – Tandem Trunking with Transfer Key

Method C – Automatic Tandem Trunking on Hang Up

Method D – Automatic Tandem Trunking Setup to Speed Dial Number
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.
TAPI Compatibility
The system has Telephony Applications Programming Interface (TAPI) compatibility
that provides:

Reduced TAPI Feature set

Caller ID data to the PC for data base lookups and screen pops

Telephone control (off-hook, on-hook and dialing)