VOIP API Providers – Which One Do You Recommend?

I’m exploring options for integrating VOIP services into my app and found a list of VOIP API providers on a blog, but I’m still not sure which one would be the best fit.

For those of you who have used VOIP APIs in your apps, which provider has worked well for you? I’m particularly interested in call quality, ease of integration, and cost-effectiveness.

I’d appreciate any insights, recommendations, or tips on what to consider when choosing a provider!

Thanks in advance!