Twilio is a US cloud communications company providing APIs for SMS, voice, video, email and customer data, which developers use to build messaging and contact-centre features.
Five9 is a US cloud contact-centre software company offering omnichannel customer engagement, intelligent routing and AI tools for call centres and customer service teams.
Genesys is a US customer experience software company offering the Genesys Cloud contact-centre platform with routing, workforce management and AI for engaging customers.