Re: [Sip] Dual registration without Outbound

[Iñaki Baz Castillo <ibc at aliax.net>]

El Miércoles, 8 de Octubre de 2008, Paul Kyzivat escribió:

> Its certainly not an idea that appeals to me.
>
> It requires an entirely non-standard routing algorithm within the proxy,
> selecting contact URI from among the available candidates in a very
> weird way.

Yes, true.


> Its an axiom of sip that UAs may choose their contact addresses as they
> wish. The encoding of any semantic information into that address is the
> business of the UA and not for any other server to second guess.

True again.


> In your example, the same proxy is responsible for the following AORs:
> - tel:+34111111
> - tel:+34222222
> - sip:a at domain.com
>
> and probably:
>
> - sip:+34111111 at domain.com
> - sip:+34222222 at domain.com
>
> Rather than have the UA register for a at domain.com and have the proxy do
> a weird mapping based on registered contact addresses, 

Why "weird"? it could be done based on a private ENUM that maps PSTN numbers 
to SIP users without the need of having PSTN numbers as userinfo in the local 
SIP users.

I could allow a user sip:a at domain.org registering for the AoR sip:
+3411111 at domain.org, but then I need to control in the registrar if the 
user "a at domain.org" has permissions to register that AoR. IMHO it's easier if 
the mapping PSTN<->SIP is done by the proxy instead of depending on the 
users, isn't?



> its much more 
> straightforward to have the UA register as follows:
>
> REGISTER sip:domain.com
> From: sip:+34111111 at domain.com
> To: sip:+34111111 at domain.com
> Contact: sip:+34111111 at my_ip
>
> REGISTER sip:domain.com
> From: sip:+34222222 at domain.com
> To: sip:+34222222 at domain.com
> Contact: sip:+34222222 at my_ip
>
> (Its required to use the sip form of the AOR rather than the tel form.
> Can't have a tel as the To of a REGISTER.)
>
> 	Thanks,
> 	Paul



-- 
Iñaki Baz Castillo
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