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 necessary to setup and manage conferences, and a multipoint processor (MP) that accepts streams from endpoints, replicates them and forwards them to the correct participating endpoints. dial up isp, , AK up isp dial up isp, dial Alaska, dial up isp
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