Question regarding conflicting grammar for IPV6 SIP URI and RFC 3986

RFC 3986 defines the following grammar for a URI:

   URI           = scheme ":" hier-part [ "?" query ] [ "#" fragment ]

   hier-part     = "//" authority path-abempty
                 / path-absolute
                 / path-rootless
                 / path-empty

A SIP URI falls into the 'path-rootless' rule:


   path-rootless = segment-nz *( "/" segment )


   segment-nz    = 1*pchar


   pchar         = unreserved / pct-encoded / sub-delims / ":" / "@"


   pct-encoded   = "%" HEXDIG HEXDIG



   unreserved    = ALPHA / DIGIT / "-" / "." / "_" / "~"


   sub-delims    = "!" / "$" / "&" / "'" / "(" / ")"

                 / "*" / "+" / "," / ";" / "="

path-rootless does not allow "[" or "]" characters, so the SIP-URI grammar for IPV6 violates RFC 3986 grammar.

SIP-URI          =  "sip:" [ userinfo ] hostport
                    uri-parameters [ headers ]

hostport         =  host [ ":" port ]
host             =  hostname / IPv4address / IPv6reference
hostname         =  *( domainlabel "." ) toplabel [ "." ]
domainlabel      =  alphanum
                    / alphanum *( alphanum / "-" ) alphanum
toplabel         =  ALPHA / ALPHA *( alphanum / "-" ) alphanum
IPv4address    =  1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT
IPv6reference  =  "[" IPv6address "]"  <-- *** violates RFC 3986 ***
IPv6address    =  hexpart [ ":" IPv4address ]
hexpart        =  hexseq / hexseq "::" [ hexseq ] / "::" [ hexseq ]
hexseq         =  hex4 *( ":" hex4)
hex4           =  1*4HEXDIG
port           =  1*DIGIT


These, though valid SIP URIs are not valid URIs:

    <sip:[2001:db8::10]>
    <sip:caller@[2001:db8::1]>

Has this already been addressed?

Regards,
Mike

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