Yes i have seen that has been deprecated,Hello Fabio,
That integration has been deprecated long time ago. Only the server side integration is available now, which works with Microsoft Dynamics 365 online (not onpremise):
https://www.3cx.com/docs/dynamics-crm-integration/
Kind regards.
Founded in 2005, when VoIP was an emerging technology, 3CX has gone on to establish itself as a global leader in business communications.