[Enum] Re: [voipeer] Re: [Geopriv] Re: [Simple] tel URIs in common policy

[Otmar Lendl <lendl at nic.at>]

On 2005/08/18 05:08, Jonathan Rosenberg <jdrosen at cisco.com> wrote:
> 
> My point is that I think it makes sense to consider the tel URI a URN, 
> and that it is merely an accident of history that it wasn't a URN more 
> properly. Now, as you and I both know phone numbers in the PSTN are 
> abused to represent lots of things, but there is no reason to carry 
> forward this confusion into voip. This is why I am proposing that when a 
> phone number is in a tel URI, it represents a name. We don't know where 
> it is on the network (indeed even if its on an IP network). To know 
> that, we translate to an address. That address is a SIP URI. That SIP 
> URI can contain a phone number, i.e. 
> sip:+19739525000 at provider.net;user=phone, however in this format the 
> phone number has been resolved to an address. The act of porting a 
> number is a change in the translation of the phone number as a name (the 
> tel URI) to the phone number as an address (the SIP URI).
> 

This is a very sensible notion.

Based on this thinking the dialing of a number on a VoIP-phone
goes through the following conceptual stages:

1) User enters a (potentially partial) number on his phone.
   The phone appends its default domain and sends the invite to its proxy:
   e.g. 	sip:5056416 at my-voip-provider.at

2) The SIP proxy applies the local dialplan to translate the 
   SIP address to an E.164 number:

   e.g. customer is in vienna, thus 5056416 maps to +43 1 5056416
   -> We now have a URN: tel:+4315056416

3) The SIP proxy now tries to route the call. In this example,
   user ENUM finds:
   "E2U+sip" "!^.*$!sip:office at enum.at!"

   or it could map to the local PSTN gateway with an URI like
   sip:+4315056416 at AS5300.my-voip-provider.at

/ol
-- 
< Otmar Lendl (lendl at nic.at) | nic.at Systems Engineer >

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