Ribbon's C20 Call Session Controller is the world’s leading IP and IMS communications convergence platform for voice and multimedia.  Integrating significant new investment in intelligent innovations, the software-centric C20 utilizes the Ribbons ATCA or Rack Mount Server platform and provides call and session control, network connectivity, switching, signaling and protocol interworking, core and edge interworking, unified multimedia communications, and applications for wireless, wireline, cable, and enterprise markets.

Deployed globally to enable new multimedia services, the C20 grows revenue and ARPU, converges disparate networks, replaces costly legacy switching, and is the cornerstone of new core networks.  It is fully carrier-grade and network-hardened, having switched billions of calls and sessions for business and residential customers.  The C20 is a key element in many of Ribbon’s Solutions including IMS, VoLTE, SIP Trunking, IPX, Peering, and Intra-Network Interconnect.

The C20 serves an important role in establishing trust context in relationship to STIR/SHAKEN and Ribbon Call Trust^TM.  In the originating network, the C20 provides origination attestation and tagging and in the terminating network it provides termination verification reporting.  In addition, C20 CDRs can be ingested by Ribbon Analytics to assist in determining potential robocall or fraud call attempts.