C4Switch is a leading provider of reliable, profitable, and intuitive global telecommunications solutions for Internet Telephony worldwide. Our scalable, innovative VoIP products and solutions are architected by a development team that has focused on revolutionizing telecommunications since 2012, delivering a cost-effective communication architecture with operating costs that cannot be matched by any traditional circuit-switched PSTN network provider worldwide.

C4Switch Difference

C4Switch has quickly established itself as a leader in the design and development of next-generation, high-performance solutions for VoIP communication systems. We also offer a full range of professional services to meet specific client needs, including consulting, technical support and custom software development.


C4Switch strongly believes that open source and open standards represent the only future for the telecoms industry. We actively contribute major fixes and enhancements to many well-known open-source projects such as Asterisk, SIP Express Router, OpenSIPS, Vovida and FreeBSD. We also actively believe that we should not compete against our clients, and so remain solely focused on developing core, leading edge, Class 4 and 5 switch technologies.

C4Switch Softswitch Solutions

The C4S Softswitch is a carrier-grade session border controller (SBC) that provides a single interface between multiple IP networks for delivery of end-to-end VoIP communications. Unique control software package enables service providers to build scalable and reliable VoIP networks with a full array of call-routing capabilities to maximize performance for both small and large packet voice networks. It has three Softswitch Solutions.

  • VOS3000 Plus
  • Crystal Link
  • VPS
  • Dedicated Server