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

["Brett Tate" <brett at broadsoft.com>]

Intentional or not, the sip-uri (excluding IPv6reference) appears to not
violate extending rfc2396's absoluteURI because the definition was a
structured subset of opaque_part.  However the introduction of brackets
to enclose an IPv6 address causes the sip-uri to no longer be a valid
absoluteURI (rfc2396) or absolute-URI (rfc3986).

I'm currently not sure if a fix is really needed or how best to correct
it.  Escaping the brackets might work; however that might cause more
headaches.


> -----Original Message-----
> From: Vijay K. Gurbani [mailto:vkg at alcatel-lucent.com] 
> Sent: Thursday, December 18, 2008 5:43 PM
> To: Brett Tate
> Cc: SIP at ietf.org
> Subject: Re: [Sip] 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?
> 
> What should the fix be?  Mike's claim is that rfc3261 
> violates rfc3986, yet rfc3986 is internally consistent in 
> that it requires IPv6 literals to be enclosed in "[" and "]",
> viz:
> 
>     IP-literal = "[" ( IPv6address / IPvFuture  ) "]"
> 
> At the same time, rfc3261 is internally consistent in that it 
> requires IPv6reference to be enclosed in "[" and "]", viz:
> 
>    IPv6reference  =  "[" IPv6address "]"
> 
> Furthermore, I don't think the intent is to produce SIP-URI 
> (as defined in rfc3261) from a URI (as defined in rfc3986), is it?
> Note that rfc3986 defines URI as:
> 
>    URI = scheme ":" hier-part ...
>    heir-part = "//" ...
> 
> If this was true, a SIP URI would need to be produced as:
> 
>    sip://[2001:db8:10] ...
> 
> In other words, I am trying to understand what the exact 
> problem is before we try to figure out where to put the fix in...
> 
> Thanks,
> 
> - vijay
> --
> Vijay K. Gurbani, Bell Laboratories, Alcatel-Lucent 1960 
> Lucent Lane, Rm. 9C-533, Naperville, Illinois 60566 (USA)
> Email: vkg at {alcatel-lucent.com,bell-labs.com,acm.org}
> Web:   http://ect.bell-labs.com/who/vkg/
> 
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