OpenCA - MGC
openCA-MGC is a feature-rich and highly scalable MGC that provides support for multiple points of interconnection between circuit-switched and VoIP networks from a single platform. It is scalable to many thousands of concurrent calls and provides a range of advanced services for flexible interworking between VoIP services and legacy networks.

Problems solved
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Allows circuit-based carriers to integrate VoIP applications with their existing circuit-switched infrastructure
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Enables IP network providers (ISPs, Public data networks) introducing voice services to increase revenue
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Allows carriers to quickly deploy a VOIP/circuit-switched interconnect that can scale to production size
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Enables circuit-based carriers to access the growing domestic and international VoIP market
Key features
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Support for multiple SS7 variants (ETSI, ANSI, ITU and country variants)
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SIGTRAN (M3UA/SCTP) SS7/IP support
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Concurrent SIP and H.323 support
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Supports up to 100,000 concurrent calls
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Management via SNMP and CLI - Optional redundancy through active/standby architecture