Re: Question regarding conflicting grammar for IPV6 SIP URI andRFC 3986

I would like to resume the discussion of the problem of IPv6 host
addresses in SIP URIs.

To abbreviate my previous message, SIP URIs appear to be intended to be
a subset of RFC 3986 "path-rootless" URIs (as are mailto: URIs).  Of the
characters that RFC 3261 permits in the user/host part of the URI, which
corresponds to the "hier-part" of RFC 3986, the following characters are
not allowed by the syntax of RFC 3986:

? (permitted in user-parts)
/ (permitted in user-parts)
[ (permitted as part of an IPv6 address)
] (permitted as part of an IPv6 address)

In order to straighten out this problem, I propose that we modify the
RFC 3261 definition to bring it into line with RFC 3986.  Specifically,
we should:

1. Remove "?" and "/" from the user-unreserved set.  (These characters
can still be used in their escaped form, which is equivalent to their
unescaped form under the current rules.)

2. Replace "[" and "]" in host-addresses by their escaped forms, "%5B"
and "%5D" (as is done in mailto: URIs).

This will inconvenience any implementation currently using the two
characters in user-names, or using IPv6 addresses.  But it avoids having
to change the master URI syntax of RFC 3986, which is a task of much
broader scope.

Comments?

Dale


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