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. Cisco says all of its products can easily be equipped for voice and that voice packets can be guaranteed via quality-of-service (QoS) policy implementation on a Cisco-switched network. Lucent, Nortel Networks and Siemens offer similar strategies for providing VoIP gateway capabilities in some form or another. While gateways
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