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we are facing issue like this [error=redirect_uri_mismatch&error_description=redirect_uri%20must%20match%20configuration]. is this problem related to 3cx or sales force.

Make 100000% sure the URL is correct. Verify protocol, slashes, port if needed (if not 443), etc.I need to chime in here. I am having the same issue when trying to set up Salesforce and 3cx. I was working last year, but now have a demo and it is broken. So i deleted the connector and recreated it. When I go to authorize I get the same error. The callback URL is correct.
Founded in 2005, when VoIP was an emerging technology, 3CX has gone on to establish itself as a global leader in business communications.