RE: AW: AW: [Sip] SIPIT Interop problem with ;user=phone

["Rosen, Brian" <Brian.Rosen@marconi.com>]

Many phones do this.

Some phones have the local dial plan interpreted in the phone,
and only emit "complete" (within the domain) phone numbers.
Some will send a tel uri, some will send the number in a sip
uri in the local (configured) domain.

I think that for most dial plans you can safely translate such
a number again by the proxy, but I worry that that is not ALWAYS
true.  So, I think it might be useful to mark a sip uri with
an uninterpreted dial string differently from a sip uri with
an interpreted phone number.  I also wonder if it might be
helpful in other circumstances; for example, where there are
several proxies in the path which have the capability to
translate dial strings to phone numbers.  Generally, I think
it's always the case that the first proxy encountered that
has the capability should do the translation.  I think it might
be useful for a succeeding proxy to know that it should NOT
translate (because it has already been translated).

Brian

> -----Original Message-----
> From: Juha Heinanen [mailto:jh@tutpro.com]
> Sent: Tuesday, September 02, 2003 12:55 PM
> To: Rosen, Brian
> Cc: 'hisham.khartabil@nokia.com'; Richard.Stastny@oefeg.at;
> fluffy@cisco.com; dean.willis@softarmor.com; sip@ietf.org
> Subject: RE: AW: AW: [Sip] SIPIT Interop problem with ;user=phone
> 
> 
> Rosen, Brian writes:
> 
>  > I think your example not ideal only because a UA could
>  > have a trivial rule that a number starting with + is known to
>  > be a globally dialable number, and thus COULD be put in a tel
>  > uri.  
> 
> 
> no matter what number the user dials (with or without +), my sip phone
> will do the same thing:  append its own domain to the number 
> and forward
> the call to the proxy of the domain.  the proxy of the phone's domain
> will then interpret the number according to the conventions that exist
> within the domain.
> 
> -- juha
> 

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