if present, it must perform a set of functions. Gatekeepers provide address translation (routing) for devices in their zone. This could be, for instance, the translation between internal and external numbering systems. Another important function for gatekeepers is providing admission control, specifying what devices can call what numbers. MCU's allow for conferencing functions between multiple terminals. They contain two parts: A multipoint controller (MC) that handles the signalling and control messages Fleischmanns cable , Fleischmanns, NY cable FleischmannsFleischmanns , cable New York, Fleischmanns cable
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