The email RFC does not specify if the user name in the email should be case sensitive or not but says that the case should be preserved in order to accommodate hosts where the user name is case sensitive.
Current practice in email is that I can write the user name in what case I choose and it will reach to the user. So what is the current practice in SIP? Do implementations ignore RFC 3261? I also could not find anything about backward compatibility to RFC 2543 who says that user names are case insensitive. Thanks --Avshalom [EMAIL PROTECTED] wrote on 10/03/2006 05:38:01 PM: > On Fri, 2006-03-10 at 16:59 +0200, Avshalom Houri wrote: > > In email as far as I know user names are NOT case sensitive. RFC 821 only > > says: > > > > Commands and replies are not case sensitive. That is, a command or > > reply word may be upper case, lower case, or any mixture of upper and > > lower case. Note that this is not true of mailbox user names. For > > some hosts the user name is case sensitive, and SMTP implementations > > must take case to preserve the case of user names as they appear in > > mailbox arguments. Host names are not case sensitive. > > I don't understand. You say "In email ... user names are NOT case > sensitive". But then you quote RFC 821 which says quite explicitly in > the 3rd sentence of your quote that user names are case sensitive. (Of > course, a mail recipient may choose to be case insensitive, and thus > accept mail for 2^n variations on an n-character user name, but that is > the recipient's choice, the protocol must allow the recipient to be make > distinctions.) > > RFC 3261 agrees, in that it specifies that user names are case > sensitive. > > I believe that the reason for specifying case sensitivity is (partially) > that case-insensitivity is very hard to internationalize. It is easy > enough to specify the pairing between A-Z and a-z, but it is difficult > to extend that to even the Latin-1 set, much less Unicode. (Do the > simplified forms of Han characters compare equal to the traditional > forms? (Is one's answer to that question a political statement?)) > > Dale > > --- > interop.pingtel.com -- the public SIP phone interoperability test server > > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
