https://developers.ringcentral.com/guide/voice/conference gives an example of adding the first caller to a conference using the Web Phone SDK. But how do I add the first caller from the backend?
Example of adding first caller to conference from the backend?
It's right there in the dev guide. After you create a conference and get the voiceCallToken, send a SIP invite with that token is the step that adds the host to the conference.
send the SIP invite to what endpoint with what protocol?
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