SIP & VOIP - Voice API

Recommend SIP & VoIP Calling Solutions for iOS & Android Application ?

I build with Twilio.


Thank you Jeff for your suggestion, I have went through the twilio websites, I am open to more suggestions.

We used CONTUS MirrorFly to build voice-calling experiences on our app. implementation was super quick and pretty straightforward.

You could check out their try it free & see if that works for you.