In order to effectively manage the resources provided by signalling over the NGN network, it is necessary to monitor and measure the present, and estimate the future performance, utilization and availability of these resources. Thus, NGN monitoring and measurement parameters standardization should be provided. This Recommendation defines the protocols for measuring and monitoring PSTN/ISDN emulation service (PES) and IP multimedia subsystem (IMS) solutions, including real-time transfer protocol/real-time transfer control protocol (RTP/RTCP), session initiation protocol (SIP), H.248/media gateway control protocol (H.248/MEGACO), signalling transport (SIGTRAN) and bearer independent call control (BICC). How to monitor and measure these parameters is out of the scope of this Recommendation.