Starting in Winter '19 (Salesforce release), Computer Telephony Integration (CTI) users see a warning message when the CTI softphone invokes the Open CTI RunApex() method on an Apex class for which the user does not have profile permission. The warning reads:
"You don't have access to the Apex Class [Class Name]. Contact your admin and have them give you access."
CTI users can dismiss the warning by clicking the X and continue working normally in existing orgs. However, for newly created orgs, RunApex() fails entirely unless the user has permission for each Apex class used in the Open CTI implementation.
Starting in Spring '19, this behavior was enforced across all organizations — users can no longer dismiss the warning in any org.
RunApex().
Note: Apex class access can be granted via Profile or via Permission Set, depending on your org's configuration and whether a managed package is involved.
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