On Apr 14, 2008, at 11:19 PM, Paul Kyzivat wrote:
>
> It won't prevent calling the user with the name that looks like a  
> number, at least not if a.com uses a location service. That is  
> because the basic 3261 rules say to ignore the uri params when  
> looking up in the location service.
>

I disagree. Once you've decided to use an RFC 3261 location service,  
what you say is probably correct. But the parameter can be used to  
make an earlier decision to use telephony routing INSTEAD of using an  
RFC 3261 location service.

RFC 3261 says:

> In addition to DNS and location service lookups shown in this  
> example, proxy servers can make flexible "routing decisions" to  
> decide where to send a request

So DNS is clearly a different sort of lookup than "location service".  
ENUM is a DNS lookup, and I see no reason why "user=phone" is not a  
valid flag for saying "don't do location service, do ENUM or TRIP or  
other telephone routing instead".
--
Dean
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