so if you have u1 and u2 and they simply wish to
communicate and they have eachother's IP, do they need
Asterisk for something?

no.


Also, in a pure SIP implementation, what does Asterisk
offer and what is Asterisk required for?

line/no. registration and setting up calls between sip phones.

asterisk is required, I believe, when you need an easy method of getting your users to be able to call one another other than supplying a list of ip addresses and fixing the ip address of each user.
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