Cisco I-Flex combines SPA interface processors (SIPs), leveraging an extensible design that enables service prioritization for voice, video and data services for intelligent, flexible and secure networking. Modular programmable interface processors, which are interchangeable across Cisco carrier routing platforms, help enterprise and service provider companies protect network investments and reduce total cost of ownership. The Cisco SPA/SIP portfolio offers a rich set of QoS features for premium service delivery.