Nextgen,Inc. provides telecommunication, session initiation protocol (SIP)/VoIP security, and enterprise solutions in Japan. The company offers carrier-grade SIP/VoIP systems to various telecommunication carriers. It also provides VoIP QA testing solutions, including NX-VNS, a VoIP node simulator; NX-V3S, a SIP fuzz test tool; and NX-V3R, an RTP/RTCP signaling test tool, as well as NX-C6000/NX-C6500, a network forensic and IDS system targeted for VoIP/IMS core network. In addition, the company offers SIP/VoIP security audit for telecom carriers, mobile operators, VoIP/IMS system vendors, and VoIP/IMS system integrators. Further, it provides session border controller, subscriber storing softswitch, HSS/HLR solution, and IP-PBX solutions for enterprises, as well as voice logging solutions for small to large networks. The company was incorporated in 2001 and is headquartered in Tokyo, Japan.