In U6 beta, we can also sync shared mailboxes contacts to the Company Phonebook.Yes, there appears to be a tick box for each of the 3 options.
Simply enabling the Contact Sync will allow extensions to sync their private contacts from 365 to 3CX.
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Founded in 2005, when VoIP was an emerging technology, 3CX has gone on to establish itself as a global leader in business communications.