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

[hisham.khartabil@nokia.com]

I agree with everything that Brian just posted.

There is one small issue left: Should we require the user to always input the domain name in a sip address (the @tutpro.com even if its a local call). I'm too lazy to type it into my phone if I'm calling a someone in the same domain (this is a handset configuration issue).

If the handset enables you to just type the username part of a sip address for local calls, then you have to tell it if you intension was to dial

0401234567

or

0401234567

So it know to put user=phone or not.

/Hisham

> -----Original Message-----
> From: ext Rosen, Brian [mailto:Brian.Rosen@marconi.com]
> Sent: Wednesday, September 03, 2003 3:41 PM
> To: Khartabil Hisham (NMP/Helsinki); jh@tutpro.com
> Cc: 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
> 
> 
> I think you have been given the wrong answer.
>    Phone: 0401234567
> if dialed, you would enter the digits 0-4-1-2-3-4-5-6-7,
> and the uac, if it did not know how to translate dial strings
> to telephone numbers would send
>   0401234567@localdomain; user=phone
> 
>   SIP: 0401234567@tutpro.com
> if dialed, would result in the uac sending
>   0401234567@tutpro.com
> 
> The original reason for user=phone was to differentiate
> between these two cases, where localdomain=tutpro.com,
> and it was intended that the resulting uas was different. 
> 
> I would say that the former results in a dial string, and
> the latter does not.  I think it is very useful for the
> proxy to be able to know that the user part of the uri is
> a dial string and not a phone number and not a username.
> 
> I think a phone number should be sent in a tel uri, at least
> on a go forward basis, and not in a sip uri.  If some proxy
> has turned a phone number into a sip uri (by an enum dip for
> example), then the result will be a sip uri which is NOT
> a phone number, nor a dial string.  This may or may not have
> numeric username.  A downstream proxy should be able to
> differentiate all of these cases, so that, for example,
> it does not invoke dial string to phone number processing,
> or another enum dip.  
> 
> Brian
> 
> > -----Original Message-----
> > From: hisham.khartabil@nokia.com [mailto:hisham.khartabil@nokia.com]
> > Sent: Wednesday, September 03, 2003 6:58 AM
> > To: jh@tutpro.com
> > Cc: Brian.Rosen@marconi.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
> > 
> > 
> > We both live in Finland. You expect me to dial +358 every 
> > time I call you?
> > 
> > > -----Original Message-----
> > > From: ext Juha Heinanen [mailto:jh@tutpro.com]
> > > Sent: Wednesday, September 03, 2003 1:31 PM
> > > To: Khartabil Hisham (NMP/Helsinki)
> > > Cc: Brian.Rosen@marconi.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
> > > 
> > > 
> > > hisham.khartabil@nokia.com writes:
> > > 
> > >  > When if I hand you this on a business card:
> > >  > 
> > >  > Phone: 0401234567
> > >  > 
> > >  > and one of your colleagues hands you this:
> > >  > 
> > >  > SIP: 0401234567@tutpro.com
> > >  > 
> > >  > What do you dial to call me and what do you dial to call your
> > >  > colleague, using your phone? How does your proxy tell the 
> > > difference?
> > > 
> > > what would the phone network do if someone in india dials the 
> > > number you
> > > gave?  it would do the same as my proxy:  route the call to a
> > > destination in a wrong local network or declare the destination
> > > unreachable.
> > > 
> > > it is thus the responsibility of the user to figure out, 
> how to turn
> > > 0401234567 into something that is correctly routable by 
> the proxy of
> > > that user the user might, for example, try to figure out from the
> > > address on the business card in which country the person 
> > > lives and then
> > > add the corresponding cc into the number.  
> > > 
> > > that is what people do every day when they have to deal with 
> > > local phone
> > > numbers in other regions.  i don't understand why we 
> > discuss this on a
> > > mailing list of a standards body.
> > > 
> > > -- juha
> > > 
> > 
> 

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