Related Rule
Azerbaijan
Practice Relating to Rule 125. Correspondence of Persons Deprived of Their Liberty
IV. National Legislation
Azerbaijan’s Law concerning the Protection of Civilian Persons and the Rights of Prisoners of War (1995) provides:
Prisoners of war are entitled to the following in all cases: … to write messages to their relatives (directly through the adverse party and points of exchange, or through the Protecting Powers or their substitute – ICRC). 
Azerbaijan, Law concerning the Protection of Civilian Persons and the Rights of Prisoners of War, 1995, Article 22(5).