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Re: [stir] RFC 8224

Christer Holmberg <christer.holmberg@ericsson.com> Wed, 07 April 2021 08:14 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Marc Petit-Huguenin <marc@petit-huguenin.org>, Cullen Jennings <fluffy@iii.ca>, "Zerr, Brad" <BZerr@tnsi.com>, IETF STIR Mail List <stir@ietf.org>
CC: "chris-ietf@chriswendt.net" <chris-ietf@chriswendt.net>, Eric Rescorla <ekr@rtfm.com>, Jon Peterson <jon.peterson@neustar.biz>, "Toy, Arthur" <atoy@tnsi.com>
Thread-Topic: [stir] RFC 8224
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Date: Wed, 07 Apr 2021 08:13:56 +0000
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Subject: Re: [stir] RFC 8224
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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=ims.mnc420.mcc312.3gppnetwork.org@ims.mnc420.mcc312.3gppnetwork.org;user=phone
....

is fine, but dialing directly an extension would be:

....
To: sip:+14085550460%2377@example.org;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 <stir-bounces@ietf.org> On Behalf Of Cullen Jennings
> Sent: tiistai 6. huhtikuuta 2021 15.30
> To: Zerr, Brad <BZerr@tnsi.com>; IETF STIR Mail List <stir@ietf.org>
> Cc: chris-ietf@chriswendt.net; Eric Rescorla <ekr@rtfm.com>; Jon Peterson <jon.peterson@neustar.biz>; Toy, Arthur <atoy@tnsi.com>
> Subject: Re: [stir] RFC 8224
> 
> 
> Adding to STIR mailing list …
> 
> 
> On Apr 5, 2021, at 9:19 AM, Zerr, Brad <BZerr@tnsi.com<mailto:BZerr@tnsi.com>> 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=ims.mnc420.mcc312.3gppnetwork.org@ims.mnc420.mcc312.3gppnetwork.org;user=phone
> 
> It should be this
> 
> To: sip:%2A55;phone-context=ims.mnc420.mcc312.3gppnetwork.org@ims.mnc420.mcc312.3gppnetwork.org;user=phone
> 
> 
> 


-- 
Marc Petit-Huguenin
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