On Thu, Feb 26, 2009 at 7:29 AM, Johansson Olle E <[email protected]> wrote:

>> IMO, "user=phone" shows user part, xxxx@, indicate TEL-URL.
>
> Where is this documented?

rfc3261, 19.1.1:

         The set of valid telephone-subscriber strings is a subset of
         valid user strings.  The user URI parameter exists to
         distinguish telephone numbers from user names that happen to
         look like telephone numbers.  If the user string contains a
         telephone number formatted as a telephone-subscriber, the user
         parameter value "phone" SHOULD be present.

(also read 19.1.6).

 ~ Theo
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