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OverSIP is an async SIP proxy/server programmable in Ruby language.

Some features of OverSIP are:

• SIP transports: UDP, TCP, TLS and WebSocket.
• Full IPv4 and IPv6 support.
• RFC 3263: SIP DNS mechanism (NAPTR, SRV, A, AAAA) for failover and load balancing based on DNS.
• RFC 5626: OverSIP is a perfect Outbound EDGE proxy, including an integrated STUN server.
• Fully programmable in Ruby language (make SIP easy).
• Fast and efficient: OverSIP core is coded in C language.

OverSIP is build on top of EventMachine async library which follows the Reactor Pattern design, allowing thousands of concurrent connections and requests in a never-blocking fashion.