Artikel 18

1. Member countries shall ensure the provision of the following mandatory supplementary services:
1.1. registration service for outbound and inbound priority and airmail letter-post items containing documents only.
1.2. (Deleted.)
1.3. tracked delivery service for inbound priority and airmail letter-post items containing goods.
2. Member countries may ensure the provision of the following optional supplementary services in relations between those designated operators which agreed to provide the service:
2.1. insurance for letter-post items and parcels;
2.2. cash-on-delivery service for letter-post items and parcels;
2.3. tracked delivery service for inbound priority and airmail letter-post items containing documents and outbound priority and airmail letter-post items containing documents and goods;
2.4. delivery to the addressee in person of registered or insured letter-post items;
2.5. free of charges and fees delivery service for letter-post items and parcels;
2.6. cumbersome parcels services;
2.7. consignment service for collective items from one consignor sent abroad;
2.8. merchandise return service, which involves the return of merchandise by the addressee to the original seller, with the latter’s authorization;
2.9. special bags containing newspapers, periodicals, books and similar printed documentation for the same addressee at the same address called ‘M bags’, up to 30 kilogrammes.
3. The following three supplementary services have both mandatory and optional parts:
3.1. international business reply service (IBRS), which is basically optional. All member countries or their designated operators shall, however, be obliged to operate the IBRS ‘return’ service;
3.2. international reply coupons, which shall be exchangeable in any member country. The sale of international reply coupons is, however, optional;
3.3. advice of delivery for registered and insured letter-post items. All member countries or their designated operators shall admit incoming advices of delivery. The provision of an outward advice of delivery service is, however, optional.
4. The description of these services and their charges are set out in the Regulations.
5. Where the service features below are subject to special charges in the domestic service, designated operators shall be authorized to collect the same charges for international items, under the conditions described in the Regulations:
5.1. delivery for small packets weighing over 500 grammes;
5.2. letter-post items posted after the latest time of posting;
5.3. items posted outside normal counter opening hours;
5.4. collection at sender’s address;
5.5. withdrawal of a letter-post item outside normal counter opening hours;
5.6. poste restante;
5.7. storage for letter-post items weighing over 500 grammes (with the exception of items for the blind), and for parcels;
5.8. delivery of parcels, in response to the advice of arrival;
5.9. cover against risks of force majeure;
5.10. delivery of letter-post items outside normal counter opening hours.