oRTP is a library implementing the Real-time Transport Protocol (RFC3550), written in C. It is easy to use and provides a packet scheduler for sending and receiving packets on time, adaptive jitter compensation, automatic sending of RTCP compound packets, and the RTCP parser API. It works with IPv6.
Seagull is a multi-protocol traffic generator test tool. Primarily aimed at IMS protocols, it is a powerful traffic generator for functional, load, endurance, stress, and performance tests for almost any kind of protocol. It currently supports Diameter, SIP, HTTP, XCAP, H.248 (ASCII) over UDP/TCP/SCTP/TLS, and TCAP over SS7 or SIGTRAN.
Sipp is a performance testing tool for the SIP protocol. It includes a few basic SipStone user agent scenarios (UAC & UAS) and establishes and releases multiple calls with the INVITE and BYE methods. It also reads XML scenario files describing any performance testing configuration. It features the dynamic display of statistics about running tests, periodic CSV statistics dumps, TCP, UDP, or TLS over IPv4 or IPv6 over multiple sockets or multiplexed with retransmission management, regular expressions and variables in scenario files, conditional branching, and dynamically-adjustable call rates. RTP play (voice, video, and RFC2833 DTMFs) is also supported.
Mobicents is a professional VoIP middleware platform. Mobicents is a JAIN SLEE 1.0 Certified product which brings to telecom application developers what J2EE brings to Web and enterprise application developers. In the scope of telecom Next Generation Intelligent Networks (NGIN), Mobicents fits in as a high-performance core engine for Service Delivery Platforms (SDP) and IP Multimedia SubSystems (IMS). Mobicents enables the composition of Service Building Blocks (SBB) such as call control, billing, user provisioning, administration, and presence sensitive features.