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I reviewed and ranked the best voice chat API & SDK providers based on,
1. Size of the company
2. how much cost to develop a voice call
3. Total number of apps integrated
4. Total voice chat features
5. Demo documentation of how to integrate
6. Demo Apps of how it works on third-party apps
7. Session control messages
8. Network configuration
9. Media capabilities
10. Hosting options(on-premises/on cloud)
These ranking points will help to choose the voice chat API for your web and mobile app and increase your engagement rate.