Re: [sipcore] A new SIP header fields with "P-" name

On 12/1/15 2:00 AM, Ivo Sedlacek wrote:
> Hello,
>
> in the last 3GPP CT1 WG meeting, 3GPP CT1 WG was unable to conclude
> whether it is possible to define and to use a new "P-"header field.
>
> Some believed that IANA registration of a new "P-" header field is not
> possible any more due to RFC5727. Others believed that IANA registration
> of a new "P-" header field is possible as long as someone already
> implemented and deployed such header field  (even if it was done recently).

My understanding of 5727 is that when it refers to "existing", it means 
those existing prior to the publication of 5727. Anybody starting to use 
a new P- header after that time should have known they were doing 
something wrong.

	Thanks,
	Paul

> Can you please provide guidance whether IANA registration of a new "P-"
> header field is likely? Thanks.
>
> RFC5727 states:
>
> ---------------------------
>
> New
>
>     proposals to document SIP header fields of an experimental or private
>
>     nature, however, shall not use the "P-" prefix (unless existing
>
>     deployments or standards use the prefix already, in which case they
>
>     may be admitted as grandfathered cases at the discretion of the
>
>     Designated Expert).
>
> ---------------------------
>
> Kind regards
>
> Ivo Sedlacek
>
>
>
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