Include in open duplex conference feature

From Zenitel Wiki

Feature: Duplex Conference - Include
Default directory number: 56 - during conversation
Feature number: 89
Parameter 1: 0 (N/A)
Description: A participant in a Duplex Conference can include other stations into the conference.

Dial 56 + directory number (station or group)

The dialler immediately goes back to the conference after terminating the dialling.

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