You need to make sure that the subscriber’s apartment is NOT whitelisted in your personal account (section “Intercoms”, then “Access Settings”). If, when submitting a request, a resident indicated that he/she does NOT have an intercom handset, then when the request is approved, his/her apartment will automatically be included in the white list. The white list simulates the presence of an analog handset (so that calls go to the mobile application). If the apartment is whitelisted and the resident has a handset, then calls will not be received thereto. You need to remove the apartment from the white list.