If the option to automatically create tickets at the start of a call is turned on, a situation could occur where the Wildix App for Zendesk Support creates a new user besides creating a ticket. This is because it's required to connect a user to a ticket in Zendesk and why the Wildix App for Zendesk Support will create a new user with, for an example, the name "Caller +31404014004".
What should I do with this new user?
To prevent your account get flooded by new users, it's important to act during the call when multiple matches are found. You can go to the User Profile in Zendesk by clicking on the "Caller +..." box in the top left and in the User Profile choose to Merge user to combine both the user who already existed and the user who was created.
More information can be found on the Zendesk Help Center about Merging a user.