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sk336ipp is a performance and memory optimized SIP UAC and IAX stack designed and developed ground-up for embedded VoIP applications including handsets. In fact, it's the most compact VoIP stack beating the competition by a hefty margin. In addition to being OS portable, sk336ipp also integrates easily with our proprietary cooperative kernel. In this configuration, the stack acts like a complete application exporting a very compact API to generate and respond to signaling events. Using callback interface for signaling, media and networking, the stack introduces a new dimension in software portability.

sk336ipp implements both IAX v2 and SIP v2 with maximum compliance to recommendations. It features:

• IAX, SIP, SDP, RTP, RTCP (SRTP, SRTCP optional)
• UDP, TCP and TLS support
• IPv6 support
• MD5 authentication support (AKAv1 and AKAv2 for 3GPP optional)
• Supports virtually unlimited number of user accounts translating to unlimited number of virtual phone lines (limited only by available memory)
  
• Small run-time memory footprint (less than 200 KB including code and data)
• Capable of running with or without OS/RTOS (using our cooperative kernel)
• Easily portable across OS/RTOS using OS mapping layer (reference ports available)
• Compact API with signaling, media and network callbacks
• Proven and tested on multiple hardware platforms against different UAS implementations