The above vendors provide a complete set of video conferencing solutions, which requires special phone line, hardware and infrastructure. But you just need to simply integrate the SDK to your application to implement the required function by using Agora CaaS.
A complete set of the solution provided by the above vendors is very expensive, while Agora CaaS is very cheap.
The solutions provided by the above vendors cannot be implemented in a mobile client, but you can integrate Agora SDK to your mobile applications.
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