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Re: [sipcore] Syntax of Feature-Caps header

Christer Holmberg <christer.holmberg@ericsson.com> Thu, 28 February 2019 14:50 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Yehoshua Gev <yoshigev@gmail.com>
CC: "sipcore@ietf.org" <sipcore@ietf.org>, "eburger@standardstrack.com" <eburger@standardstrack.com>
Thread-Topic: Syntax of Feature-Caps header
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Subject: Re: [sipcore] Syntax of Feature-Caps header
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HI Yehoshua,

Please see inline.

>I have a question regarding the syntax of the Feature-Caps header since I've not managed to find any real examples of its usage.
>
>The ABNF in RFC 6809 is defined as:
>   Feature-Caps = "Feature-Caps" HCOLON fc-value
>                   *(COMMA fc-value)
>   fc-value     = "*" *(SEMI feature-cap)
>   feature-cap       =  "+" fcap-name [EQUAL LDQUOT (fcap-value-list
>                            / fcap-string-value ) RDQUOT]
>
> Following this syntax, I guess that for sip-push the header will look like:
>   Feature-Caps: *;+sip.pns="webpush"
>
>
>One example I could find is on https://tools.ietf.org/html/draft-ietf-sipcore-rejected-03:
>   Feature-Caps: sip.608
>Without the asterisk and the plus sign.
>
> Which one is correct?

The sip.pns example is correct. The sip.608 example needs to be corrected.

(I THINK I had previously commented on this when reading sipcore-rejected, but I may be wrong…)

>Due to the lack of examples, would it be possible to add an example to the sip-push draft that includes feature capabilities
>and media tags (especially that sip.pnsreg is used for both)?

I will look into it. I guess that could be done when addressing Ben’s comments.

Regards,

Christer

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