We have integrated the WebRTC phone SDK into our website, and currently are having issues getting incoming audio from the other party. They can hear us communicating through the browser, but we can't hear them. We are using the latest versions of Chrome, and have tested on both Windows and macOS.
The incoming call alert tone can be heard so it's not a browser audio tab issue.
Did you try using just the demo app and get me the results https://ringcentral.github.io/ringcentral-web-phone/ ? Please send the logs from the demo app on a support ticket and send an email to vyshakh.babji@ringcentral.com
I have the same issue on our implementation. I tested chrome setting by automatically playing an audio file - no problems. But when we initiate a call, the other party can hear the audio (so microphone working) but nothing plays on the computer. Neither the ring sound or the audio in the connected call. See confirmed chrome settings. 
We solved this by adding back the remote and local video html tags. At some point they got removed. Also make sure you’re linking the DOM elements when configuring the SDK.
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