Ribbon’s market-leading Call Controllers and Softswitch software enable service providers to deliver mobile, fixed, long-distance, business, and consumer voice services. Our call controllers lead the global market in transforming networks and are the basis for core services and switching infrastructure for millions of users around the world.

Call Controller Products


C3 Call Controller

Multi-application virtual call server and media resource/media gateway controller, deployed by leading communications service providers


C15 Call Controller

Enable IP and legacy services for Class 5 replacement, including HD voice, Centrex, web portal, mobility, video calling, & call logging.


C20 Call Controller

Provides call and session control, network connectivity, switching, signaling, protocol interworking, voice and communications.

Experts in Network Transformation

Ribbon is the Market Leader in Class 4/5 Transformation Services and We Have the People, Process, Tools, and Capabilities to Get the Job Right.

Over 3000 Offices Collapsed


Over 770 Legacy Switches Transformed


Solutions Migration to Virtualization and NFV

End-to-End Proven Class 4 and 5 Transformation Solutions & Services


Virtualizing Your Core Networks

Virtualized Access and Media Gateway Control Function Deployment Options For Service Providers

Download Analytics for C20 Solution Brief

Download our Virtual C20 Datasheet

The C20 simplifies complex architectures delivering voice and multimedia services that enable new services and revenue growth

Call Controller Products and Solutions

Ribbon is the market leader in Class 4/5 transformation services with three state-of-the-art and widely deployed carrier class platforms and software


Services C20 Call Controller C3 Call Controller C15 Call Controller
Applications Class 4 and Class 5 Class 4 Class 4 and Class 5
Server Provider Type Tier 1, 2, and 3 Tier 1 and 2 Tier 3
Deployment Options Virtualized Virtualized Appliance
BHCA Up to 6 Million 1 Million (Per Server Pair) 250,000
CS2000 Upgrade *    
DMS, EWSD, 5ESS, Collapse, Migrate and Replacement *   *
Local and Tandem * * *
IPX / Transcoding   *  
VoLTE   *  
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