That, treating anything that smells like an E.164 like an E.164, may 
well be common practice.
But it seems to me
a) it is a practice which is inherently misleading and error prone
b) it is a practice we can not sensibly design for / around.
c) It is not the working group's problem to repair security flaws 
introduced by such behavior.  It is the vendor's problem.

Yours,
Joel M. Halpern

Hadriel Kaplan wrote:
>> -----Original Message-----
>> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Paul
>> Kyzivat
>> Sent: Monday, February 18, 2008 4:07 PM
>>
>> Joel M. Halpern wrote:
>>> Case 1 - No ;user=phone option
>>> In the absence of a ;user=phone option, the user part of the SIP URI
>>> should be considered an opaque string.  It should not be considered an
>>> E.164 number, even if it is formatted as a telephone subscriber number.
>>>   I can legitimately use [EMAIL PROTECTED] as a SIP URI.  And
>>> if the whitehouse.com deliberate confusion is still active, they could
>>> use [EMAIL PROTECTED] as a SIP URI.
>>> It is reported that some SIP devices will display the phone number
>>> without the domain for such URIs.  That is a UI error, not a protocol
>>> error.  The protocol can not make the UI do the right thing.
>> I agree with you. But common practice is otherwise.
> 
> Definitely.  If the user part even smells like an e164, it's treated as one 
> by a lot of folks. :(
> 
> -hadriel
> 
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