Technical Summary
This document lays the groundwork for future "Happy Eyeballs"-style
work on SIP by updating DNS procedures for SIP URI resolution rules
in a way that clarifies behavior for SIP stacks that support both
IPv4 and IPv6.
Working Group Summary
The document spent several years in the working group, with
occasional bursts of activity. The final push to completion
was performed over the past few months by a concerted effort of a new
author, who both incorporated long-standing feedback from the working group
and worked out some of the finer details of the document. No aspect of
the discussion proved controversial.
Document Quality
The document received in-depth review from a small handful of
working group participants, and the results of those reviews
were incorporated into the final version. No implementations
of the protocol described in the document are known to exist yet;
however, some of the problems addressed by the draft have been
concretely demonstrated at the SIPit 31 interop event (which also
highlighted some previously unnoticed problems with dual-stack
address resolution). Dan Wing provided expert review for interaction
with "Happy Eyeballs" techniques.
Personnel
Adam Roach is the document shepherd. Ben Campbell is the
responsible area director.