Related Rule
Canada
Practice relating to Rule 66. Non-Hostile Contacts between the Parties to the Conflict
Section C. Definition of parlementaires
Under Canada’s LOAC Manual (1999), parlementaires are intermediaries by whom negotiations between belligerent commanders may be conducted. 
Canada, The Law of Armed Conflict at the Operational and Tactical Level, Office of the Judge Advocate General, 1999, p. 14-1, § 3.
Canada’s LOAC Manual (2001) states in its chapter entitled “Communications and contact between opposing forces”:
1. Negotiations between belligerent commanders may be conducted by intermediaries known as parlementaires. The wish to negotiate by parlementaires is frequently indicated by the raising of a white flag, but any other method of communication such as radios may be employed.
2. Parlementaires normally operate under a white flag of truce. A parlementaire may be accompanied by other personnel agreed upon by the commanders involved. 
Canada, The Law of Armed Conflict at the Operational and Tactical Levels, Office of the Judge Advocate General, 13 August 2001, § 1402.1–2.