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You can create up to 256 intercom groups per standard and up to 1024 intercom groups with SA9035 - Increased Intercom Groups on one server that runs Communication Manager.
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Each group can contain up to 32 extensions in it.
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You can assign the same extension to different groups.
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Intercom calls are possible only between extensions in the same group.
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Any group member with a feature button for Dial Intercom can make an intercom call to any other member in the group.