Re: [Sipping] Question on draft-ietf-sipping-v6-transition-07

["Vijay K. Gurbani" <[e-mail]>]

Elwell, John wrote:
> Thanks, but I was concerned that a domain name beginning with "."
> might be wrong; Taking the SIP ABNF as an example (SDP ABNF isn't so
> precise), we have:
> 
> hostname         =  *( domainlabel "." ) toplabel [ "." ]

John: Quite true.  However, in the case we are talking about,
the ".invalid" appears in the SDP, which is governed by the
SDP ABNF.  The ".invalid" is not appearing in the URI, but
in the "c=" line in SDP.

The SDP ABNF in rfc4566 has this grammar for the
"c=" line:

connection-field =    [%x63 "=" nettype SP addrtype SP
                          connection-address CRLF]
connection-address =  multicast-address / unicast-address
unicast-address =     IP4-address / IP6-address / FQDN / extn-addr
extn-addr =           non-ws-string
non-ws-string =       1*(VCHAR/%x80-FF)
                       ;string of visible characters

Does not ".invalid" in the SDP result from the extn-addr
production rule above?  Consequently, should it not be legal?
Or am I missing something here?

Thanks,

- vijay
-- 
Vijay K. Gurbani, Bell Laboratories, Alcatel-Lucent
1960 Lucent Lane, Rm. 9C-533, Naperville, Illinois 60566 (USA)
Email: vkg@{alcatel-lucent.com,bell-labs.com,acm.org}
Web:   http://ect.bell-labs.com/who/vkg/