Re: [stir] RFC 8224

[Chris Wendt <[e-mail]>]

This is a legit question for RFC8224 and agree with the answers, but just in case it’s relevant you would not send these types of SIP URIs as dest in context of STIR/SHAKEN (over NNI/peering relationship) which only supports tel URIs currently.  That may not be your use-case but just wanted to clarify in case it was relevant.  I would be curious to know the context if you are willing to share though, i am guessing intra network use case between device and app server?  Definitely interested in those cases, for me in context of delegate certs.

-Chris

> On Apr 7, 2021, at 9:52 AM, Christer Holmberg <[e-mail]> wrote:
> 
> Hi,
>  
> ´*´ can be used as such in a SIP-URI, but ‘#’ would have to be escaped.
>  
> So:
>  
> To: sip:*55;phone-context=[e-mail];user=phone <sip:*55;phone-context=[e-mail];user=phone>
>  
> …is ok, but;
>  
> To: sip:#55;phone-context=[e-mail];user=phone <sip:*55;phone-context=[e-mail];user=phone>
>  
> …is NOT ok. Instead:
>  
> To: sip:%2355;phone-context=[e-mail];user=phone <sip:%2355;phone-context=[e-mail];user=phone>
>  
> …will have to be used.
>  
> Regards,
>  
> Christer
>  
>  
>  
> From: Zerr, Brad <[e-mail]> 
> Sent: keskiviikko 7. huhtikuuta 2021 14.27
> To: Christer Holmberg <[e-mail]>; Marc Petit-Huguenin <[e-mail]>; Cullen Jennings <[e-mail]>; IETF STIR Mail List <[e-mail]>
> Cc: [e-mail]; Eric Rescorla <[e-mail]>; Jon Peterson <[e-mail]>; Toy, Arthur <[e-mail]>
> Subject: RE: [stir] RFC 8224
>  
> Good Morning.
>  
> Would you mind providing an example of what the TO header should look like for both a * and # dial to help clear up?  Assume they are leading characters in the TO header.
>  
> Example of what is being sent today:
>  
> To: sip:*55;phone-context=[e-mail];user=phone <sip:*55;phone-context=[e-mail];user=phone>
>  
> To: sip:#55;phone-context=[e-mail];user=phone <sip:*55;phone-context=[e-mail];user=phone>
>  
> From: Christer Holmberg <[e-mail] <mailto:[e-mail]>> 
> Sent: Wednesday, April 7, 2021 3:14 AM
> To: Marc Petit-Huguenin <[e-mail] <mailto:[e-mail]>>; Cullen Jennings <[e-mail] <mailto:[e-mail]>>; Zerr, Brad <[e-mail] <mailto:[e-mail]>>; IETF STIR Mail List <[e-mail] <mailto:[e-mail]>>
> Cc: [e-mail] <mailto:[e-mail]>; Eric Rescorla <[e-mail] <mailto:[e-mail]>>; Jon Peterson <[e-mail] <mailto:[e-mail]>>; Toy, Arthur <[e-mail] <mailto:[e-mail]>>
> Subject: RE: [stir] RFC 8224
>  
> Hi,
> 
> >I think the question was about the format to use before canonicalization.
> >
> >My understanding of RFC 3986 is that `#` should be escaped because it is the delimiter for an URI fragment. Fragments are not defined in SIP URIs, but a generic URI parser may still remove everything after and including '#'.
> 
> "#" will have to be escaped in a SIP-URI, e.g., in a To header field.
> 
> But, Section 8.3 of RFC 8224 has nothing to do with a SIP-URI or the To header field.
> 
> Regards,
> 
> Christer
> 
> 
> 
> 
> 
> 
> 
> OTOH there is no need to escape '*' as it is part of the `sub-delims` rule.
> 
> so
> 
> ....
> To: sip:*55;phone-context=[e-mail];user=phone <sip:*55;phone-context=[e-mail];user=phone>
> ....
> 
> is fine, but dialing directly an extension would be:
> 
> ....
> To: sip:[e-mail];user=phone <sip:[e-mail];user=phone>
> ....
> 
> On 4/6/21 5:43 AM, Christer Holmberg wrote:
> > Hi,
> > 
> > %2A is not the ASCII format of *, it is the escaped (see RFC 3261).
> > 
> > And, the syntax allows both * and #, so no need to escape (in fact, it is not even possible to escape in this case):
> > 
> > tn-spec = 1*tn-char
> > tn-char = "#" / "*" / DIGIT
> > 
> > Also, note that RFC 8224 does not define the syntax of the To header field - that is done in RFC 3261. The telephone number described in Section 8.3 of RFC 8224 will be included in the PASSPort (RFC 8225).
> > 
> > Regards,
> > 
> > Christer
> > 
> > From: stir <[e-mail] <mailto:[e-mail]>> On Behalf Of Cullen Jennings
> > Sent: tiistai 6. huhtikuuta 2021 15.30
> > To: Zerr, Brad <[e-mail] <mailto:[e-mail]>>; IETF STIR Mail List <[e-mail] <mailto:[e-mail]>>
> > Cc: [e-mail] <mailto:[e-mail]>; Eric Rescorla <[e-mail] <mailto:[e-mail]>>; Jon Peterson <[e-mail] <mailto:[e-mail]>>; Toy, Arthur <[e-mail] <mailto:[e-mail]>>
> > Subject: Re: [stir] RFC 8224
> > 
> > 
> > Adding to STIR mailing list …
> > 
> > 
> > On Apr 5, 2021, at 9:19 AM, Zerr, Brad <[e-mail]<mailto:[e-mail] <mailto:[e-mail]%3cmailto:[e-mail]>>> wrote:
> > 
> > Good Morning.
> > 
> > This may not be the correct process, so let me know if I should ask this in a different forum.
> > 
> > I had a question regarding section 8.3 when it comes to * and # handling. Is this stating that when a * or # proceeds a digit string (i.e. *55), it should be in ASCI Format for the * (i.e. %2A)
> > 
> > <image001.png>
> > 
> > So Instead of this:
> > 
> > To: sip:*55;phone-context=[e-mail];user=phone <sip:*55;phone-context=[e-mail];user=phone>
> > 
> > It should be this
> > 
> > To: sip:%2A55;phone-context=[e-mail];user=phone <sip:%2A55;phone-context=[e-mail];user=phone>
> > 
> > 
> > 
> 
> 
> -- 
> Marc Petit-Huguenin
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