The MUX unified registration service is a service that l'AOC makes a available to Catalan public administrations that allows the integration of l'AOC services with the general entry and exit register of each organization.

With this integration, the entries of input and output entries generated by the l'AOC services are made directly in the general register of the l'organization instead of being made in the auxiliary electronic register of the l'EACAT. Rules can be defined that allow entries to be made in different registers depending on the request parameters that are established.