Re: Dual registration without Outbound

I think I am missing something here. I presume that the knowledge of the 
UA is limited to:
- to proxy addresses
- an AOR to register

Presumably the address of the registrar is derived from the AOR to 
register by removing the user part. So the UA, when registering, doesn't 
specify two different registrars. Whether there are two or not is a 
function of how the proxy routes the register request. So whether the 
two registers for the same contact go to one registrar or two is unknown 
to the UA. In some configurations this would give you redundancy, and in 
others it would not.

Then, what causes the UA to register two different contacts? Are the 
wlan contact and the 3g contact registered to *different* AORs? If not I 
don't see the point. If anything, I would expect that 3g and wlan 
represent access networks and hence differing proxies, not AORs or 
registrars.

	Thanks,
	Paul

Christer Holmberg wrote:
> Hi, 
> 
>  > So, you want to register both contacts to both registars, right?
>  >
>  > Example:
>  >
>  > UA_Contact_wlan ----- OB_1 ----- REG_1 
>  > UA_Contact_wlan ----- OB_1 ----- REG_2
>  > UA_Contact_3g   ----- OB_2 ----- REG_1
>  > UA_Contact_3g   ----- OB_2 ----- REG_2
> 
>> no, like this:
> 
>  > UA_Contact_wlan ----- OB_1 ----- REG_1  
>  > UA_Contact_wlan ----- OB_2 ----- REG_2
>  > UA_Contact_3g   ----- OB_1 ----- REG_1
>  > UA_Contact_3g   ----- OB_2 ----- REG_2
> 
> Now, in your example, if OB_1 and REG_2 fail you don't still don't have
> redundancy :)
> 
>> if outbound does not mandate that UA must register each contact with
> both ob proxies, my pleasant surprise was a too
>> early one and ob draft falls back to the useless bin.
> 
> I don't have the spec in front of me, but I don't think it currently
> talks about multiple contacts.
> 
> I guess this all comes back to Dean's question whether we need some new
> text into the draft.
> 
> In order to avoid delaying the Outbound spec even more, I guess it could
> also be an extension draft:"Outbound with multiple contacts", or
> something like that...
> 
> Regards,
> 
> Christer
> 
> 
> 
> 
> 
> -- juha
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