Features like #CallWaiting were monetized through recurring monthly charges, too.
Remember when #CallerID came in and you had to pay $2.50/month to find out who was calling you before you answered the phone? That's a pure Bellhead play. If we applied this principle to the internet, then you'd have to pay $2.50/month to see the "from" line on an email before you opened it.
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Bellheads believed in "smart" networks. Netheads believed in what @davidisen called #TheStupidNetwork, a #DumbPipe whose only job was to let some people send signals to other people, who asked to get them:
https://www.isen.com/papers/Dawnstupid.html
This is called the #EndToEnd (#E2E) principle: a network is E2E if it lets anyone receive any message from anyone else, without a third party intervening.
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