The framework and guidance contained in this Recommendation apply to all signalling protocols, including those used to access network resources as well as those used within a network to provide services to users of the network.
ITU-T Q.1400 SPANISH-1993 history
1993ITU-T Q.1400 SPANISH-1993 ARCHITECTURE FRAMEWORK FOR THE DEVELOPMENT OF SIGNALLING AND OA&M PROTOCOLS USING OSI CONCEPTS