Cisco H225 MIB module. This module consists of H225 call signaling and H225 RAS (Registration, Admission and Status). These are protocols specified by H323 for transmission of real-time audio, video and data over packet-based networks. H225 call signaling is used to set up connections between H323 endpoints such as terminals and gateways, over which the real-time data can be transported. H225 RAS is the protocol between endpoints (terminals and gateways) and gatekeepers.