Avaya DECT R4 Installation And Administration Manual page 239

Conference number – The phone number to the conference bridge (PTT server) that is
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provided by the system administrator.
Answer mode – Determines if the PTT call shall be automatically or manually answered.
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Speaker mode – Determines if the PTT call shall be answered in loudspeaker mode.
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For configuring PTT call using MX Exchange, see Configuring PTT on Meeting Exchange on
page 705
Avaya DECT R4 - Installation and Maintenance Guide
Telephone configuration
239
02/2016