across a LAN or WAN to another gateway where it is reconstituted back into a format that is understood by the receiving phone system. Gateway functionality can be obtained through stand-alone boxes, modules or chassis cards for proprietary boxes; also expandable routers or software and expansion cards for Windows NT servers. One of the front-runners in VoIP, Cisco is taking a modular approach with a voice-over-IP card that fits its routers.
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