Alternative to Phono? (Call attending inside websites)

Hello everybody. I am exploring the Tropo capabilities in terms of on-click calls. I read that Phono enabled the usage of a JS SIP phone right inside HTML5 front-end, but as I could see on this page, it is no longer being supported. 

Although a sort of official tutorial is still available, it requests an API key which I believe was provided upon request on the official page. 

Taking this into account, is there any other method today for making this possible?






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