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 are the most popular VoIP products on the market -- available Brookings 56k , Brookings, OR 56k BrookingsBrookings , 56k Oregon, Brookings 56k
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