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We could have easily been calling eachother by our email (SIP URIs) addresses. It is a shame that instead we got a dozen walled gardens when it comes to making voice/video calls over the internet.

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Can you share some resources explaining how this could be set up?

One way was SIP and SRV DNS records. Seemed like it had some of the problems email has except it’s a phone ringing instead of spam.

TRIP/ITAD is/was a framework that I believe was designed to facilitate this. Unfortunately it never took off. https://www.rfc-editor.org/rfc/rfc2871

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