Re: [Sip] Securing messages with TEL URI over SIP

["Olle E. Johansson" <oej at edvina.net>]

15 okt 2009 kl. 18.44 skrev Paul Kyzivat:

> Avshalom Houri wrote:
> > I have found discussion thread on how to secure e.g. TEL URI over  
> > SIP from 2007.
> > transport=tls is deprecated and it does not mean end to end anyway.
> > We still do not have "tels" URI.
> > Was this discussion concluded and if how it was concluded?
>
> AFAIK there was never any resolution of this - nobody knows how to  
> do it.
>
> I think the most fundamental problem is that there is no good answer  
> to who is permitted and able to authenticate the use of a particular  
> TEL URI.

That's a very interesting issue. The Tel: uri gets routed somehow, by  
default route in a proxy or outbound proxy setting in a UA.
This really applies to all NON-sip/sips uri's in SIP.

Food for thought. And something that causes damage for the use of Tel:  
URI's.

/O