Avaya DECT R4 Installation And Administration Manual page 706

Configuring PTT on Meeting Exchange
7. Verify the status of MX Server. If service is established it shows as active.
8. Go to Meeting Exchange / Audio Conferencing / Bridge feature.
9. Click on checkbox of Meeting exchange server and click "Configure" button.
10. Go to Meeting Exchange / Audio Conferencing / Bridge feature /Sign In Users.
11. Click Edit button.
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Avaya DECT R4 - Installation and Maintenance Guide 02/2016