World’s Largest Messaging Interconnect System 

Powering inter-carrier messaging since 2003

KONTXT Integrated Messaging Suite

RealNetworks KONTXT IMS (formerly known as Metcalf) powers the world’s largest messaging interconnect system and delivers over 2 billion messages each day.


Over 5 trillion message sessions never dropping a single message or incurring a service interruption for customers since launching 20+ years ago.


Beyond messaging, RealNetworks products run on more than 700 million mobile handsets via the world’s most popular carriers, including Verizon, Vodaphone, Telefonica, KDDI, and others

History of Innovation

In addition to our longstanding expertise in mobile, RealNetworks operates a center of excellence in machine learning and artificial intelligence. KONTXT applies this state-of-the-art machine learning capability to analyze and reveal the true nature of messages on your network.

Deliver a Better Experience to Your Subscribers

Combining next generation technology with our deep operational experience, KONTXT delivers a new level of messaging integrity, smart routing, and control for the mobile messaging industry.

Protect your customers

Advanced threat intelligence filters unwanted messages and fights spoofing, smishing and fraud from reaching your customers.

Know your traffic

Analytics and reporting on traffic trends and composition by categories and originating entities gives you the actionable data you need to make decisons.

Optimize your revenues

Understanding your traffic and potential threats enables you to offer class-of-service delivery prioritization to enterprise senders and ensure compliance for A2P message senders.

Start Protecting Your Network With KONTXT

Learn more and get a demo of KONTXT Integrated Messaging Suite.