For outbound calling campaigns, Voice uses the E.164 telephone dialing format, which is a standard and internationally used model.
In the contact bases that you share with Aivo, the telephone numbers must respect this structure, so that the calls are made effectively, otherwise, they cannot be made.
Plus sign (+) country code
Area code (some do not have)
Important: The maximum number of digits is 12.
In the case of Argentina, cell phones have a different form than the rest of the countries: - +549 + area code + cell phone number without 15