Learn how a service combining cloud delivery with integration into multiple mobile networks (Hybrid-OTT) provides enhanced call completion for both smart- and non-smartphone users in Africa, where smartphones have limited, though growing, penetration. The service enables users to receive missed-call and voicemail notifications, and respond to them in the form of texts, voice, or rich media over data. The service has reached adoption of more than 25% in some countries, with 2.5 billion calls every month, and more than 100 billion calls in the aggregate. Learn about the challenges Kirusa discovered and how we overcame them.