I like this version it seems to have resolved many of the things I was
worried about.
One significant thing...
Saying you can use PAI to authenticate registrations seems like an
update to 3261 not 3325. This seems like a pretty big change to SIP
security. I also have a hard time imagining the type of UA that would
both need to register, and were in the Trust Domain.
Nits.
I don't recall 3325 being unclear on use of PAI in responses. It
explicitly did not define it - there not much unclear about that.
Cullen in my individual contributor roll
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