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The Cisco voice network modules and interface cards provide the means for combining both voice and data within a single network. This allows users to take advantage of services, such as IP telephony for enterprises or Voice over IP for Service Providers, without losing voice quality. Cisco IOS Software also combines built-in quality-of-service (QoS) features along with standards-based (F encapsulation and fragmentation, providing competent direct transport of voice and fax over IP, Frame Relay, and ATM networks.
Usedrouter.com, Inc buys and sells new and used Cisco Voice Modules and Voice Interface Cards.