What are the technical requirements for audio calls?

You can make browser-based audio calls via Userlike. You don't need a phone number from the contact and can transition from a chat to an audio call.
Audio call connections are made through Twilio. See the following links to learn more about the requirements to establish connections:

https://www.twilio.com/docs/voice/client/javascript/voice-client-js-and-mobile-sdks-network-connectivity-requirements#signalling-connectivity-requirements

https://networktest.twilio.com/

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