I think the standard for X- is inherited from it's daddy: HTTP and in
turn from it's daddy: SMTP



On Mon, Aug 1, 2011 at 8:55 PM, Ken Rice <krice@freeswitch.org> wrote:

X- is not covered in any RFCs for SIP, however P- is covered...

X- is as you said kinda along for the ride

On 8/1/11 8:07 PM, "Andy Spitzer" <woof@iwoof.org> wrote:

Woof!

On Aug 1, 2011, at 18:12 , Anthony Minessale wrote:

maybe you should tell Cisco that they are supposed to start

nonstandard headers with X-

That's always been the convention, but there has been some noise about

deprecating the use of the X- prefex in general  (see

http://tools.ietf.org/html//draft-saintandre-xdash-03).

For SIP, I believe the convention was never codified into any standard, and it

just came along for the ride with the other RFCS that it "inherited" from

(such as HTTP).  So much as I like to rag on Cisco for non-standard SIP

implementations, this is not one of them.

--Woof!

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