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

Brett Tate wrote:
> Greetings,
>  
> Mike's interpretation looks correct.  Is this something that should be 
> fixed?  If so, should the fix be placed within draft-ietf-sip-ipv6-abnf-fix?

Funny - this just came up in another conversation I was having.
It was pointed out to me that the 3261 ABNF for the sip URI is probably 
derived from RFC-2396 which has since been obsoleted by RFC-3986. 
RFC-3987 explicitly allows the [ ] notation for IPv6.

So yeah, the URL syntax should probably be corrected.

	Thanks,
	Paul

> Thanks,
> Brett
> 
>     ------------------------------------------------------------------------
>     *From:* [email protected] [mailto:[email protected]] *On
>     Behalf Of *Szilagyi, Mike
>     *Sent:* Thursday, December 18, 2008 10:53 AM
>     *To:* [email protected]
>     *Subject:* [Sip] Question regarding conflicting grammar for IPV6 SIP
>     URI andRFC 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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