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For those of us less informed: assuming a Matrix <-> PSTN bridge exists, does that mean that one would be able to send and receive phone calls and SMS to existing GSM numbers via a dedicated VOIP number? I don't understand PSTN at all, but wouldn't giving all matrix users dedicated VOIP numbers be difficult and costly?

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Yup, that's the idea. Given this was the Matrix team's dayjob before getting sucked into Matrix, it's something relatively easy to do - although yes, we'd have to pass through the call/SMS and numbering costs. Now, if only Matrix had a payments ecosystem... https://matrix.org/blog/2017/08/22/thoughts-on-cryptocurrenc...

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