> -----Original Message-----
> From: Juha Heinanen [mailto:[EMAIL PROTECTED] 
> Sent: Saturday, April 05, 2008 7:48 AM
> To: Dan Wing
> Cc: [email protected]; 'Elwell, John'
> Subject: Re: [Sip] Migration from E.164 to email-style SIP URIs
> 
> Dan Wing writes:
> 
>  > On an outgoing request containing an e164-style URI in the From:
>  > (or PAI, as you prefer), the domain additionally places the user's 
>  > email-style URI into a new header (let's call it "email-identity").
>  > It determines the mapping between a user's E.164 URI and email URI
>  > using a flat database (example: +14085551234 -> [EMAIL PROTECTED]).
> 
> my proxy is currently is using P-Preferred-Identity header for that
> purpose.  why is a new header needed?

The header, containing the email-style URI, needs to be signed.

I do not care if it is a new header or not, but I see value in not
overloading a header with an already-defined semantic (such as
P-Preferred-Identity).  But this is a detail.

-d

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