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I had come across it a few days ago too, and I am currently going through a couple of chapters. Not for the faint-hearted, or for cursory reading.

unless you already work in cloud/mobile, then it's like a comic book. Particularly humorous, imho, is this page: http://aosabook.org/en/posa/secrets-of-mobile-network-perfor..., which doesn't even mention any of the mobile-specific CDNs or telecom infrastructure in any depth other than "Core Network" which "In practice this delay is generally neglible" aka, nothing to see here.

Could you make any recommendations on other items worth reading?

Read up on Warp.

Are you talking about the PBX or something else?

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