What is Voice over Internet Protocol (VoIP)? Is a family of transmission technologies for delivery of voice communications over IP networks such as the Internet or other packet-switched networks.

Cisco Unified IP Phone 9900 Series (9951, 9971)

The Cisco Unified IP Phone 9900 Series delivers high-quality, interactive multimedia communications and advanced features in an elegant ergonomic design that is user - and eco-friendly.

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