(b) the central authorities of the receiving State if this is allowed by the laws, regulations and usages of the receiving State or by relevant international agreements. 4. The privileges and immunities of the members of a diplomatic mission referred to in paragraph 2 of this article shall continue to be governed by the rules of international law concerning diplomatic relations. Article 71 Nationals or permanent residents of the receiving State 1. Except insofar as additional facilities, privileges and immunities may be granted by the receiving State, consular officers who are nationals of or permanently resident in the receiving State shall enjoy only immunity from jurisdiction and personal inviolability in respect of official acts performed in the exercise of their functions, and the privileges provided in paragraph 3 of article 44. So far as these consular officers are concerned, the receiving State shall likewise be bound by the obligation laid down in article 42. If criminal proceedings are instituted against such a consular officer, the proceedings shall, except when he is under arrest or detention, be conducted in a manner which will hamper the exercise of consular functions as little as possible. 2. Other members of the consular post who are nationals of or permanently resident in the receiving State and members of their families, as well as members of the families of consular officers referred to in paragraph 1 of this article, shall enjoy facilities, privileges and immunities only insofar as these are granted to them by the receiving State. Those members of the families of members of the consular post and those members of the private staff who are themselves nationals of or permanently resident in the receiving State shall likewise enjoy facilities, privileges and immunities only insofar as these are granted to them by the receiving State. The receiving State shall, however, exercise its jurisdiction over those persons in such a way as not to hinder unduly the performance of the functions of the consular post. Article 72 Non-discrimination 1. In the application of the provisions of the present Convention the receiving State shall not discriminate as between States. 2. However, discrimination shall not be regarded as taking place: (a) where the receiving State applies any of the provisions of the present Convention restrictively because of a restrictive application of that provision to its consular posts in the sending State; (b) where by custom or agreement States extend to each other more favourable treatment than is required by the provisions of the present Convention. 27