Intercom allows for two-way audio between two extensions. Enable or disable the intercom (auto-answer) functionality for internal calls (extension to extension) in PBX Settings.
One-time Intercom
If this functionality is not enabled, you can also perform a one-time intercom by dialing *8+(extension number).
How to use 2-way Intercom
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Dial *8 and the extension example for extension 111 (*8111)
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It will dial and connect to that extension without any other steps.
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This can also be accomplished by using the Presence keys on the phone