Initiation; parties

(1) The Decision Chamber initiates a procedure of its own motion or on application.
(2) The following are parties to the procedure before the Decision Chamber: 1. the applicant, 2. the operators of public telecommunications networks and the providers of publicly available telecommunications services against whom the procedure is directed, 3. the persons and associations of persons whose interests are affected by the decision and whom the Federal Network Agency has, on their application, joined to the procedure.