Re: [Sip] outbound-08 : using different Contact URIs for different flows?

[Paul Kyzivat <[e-mail]>]

Jeroen,

Abstractly I understand your issue, and it seems valid, though I would 
like to think about it a bit.

But I'm trying to think of why you would want to do this. If a single UA 
registers multiple contacts with the same AOR, then it is pretty likely 
that incoming calls will be delivered to the UA multiple times. That 
seems like an undesirable situation.

	Paul

Jeroen van Bemmel wrote:
> All,
>  
> While trying to implement GRUU and outbound in combination, I stumbled 
> upon a minor issue: what if the UAC uses different Contact URIs when 
> registering multiple flows. The examples in outbound don't do this, but 
> there is no explicit statement that this is not allowed, and the example 
> in 3.2 (line1@192.168.0.2>;reg-id=1 
> <mailto:line1@192.168.0.2>;reg-id=1>) could be seen as suggesting that 
> the registration with reg-id=2 would use "line2"
>  
> See my previous mail: for GRUU this could mean that the authorative 
> proxy cannot select the right URI to rewrite with, there can be an 
> inconsistency between the temporary GRUU the UAC selected (associated 
> with a specific contact) and the request URI received.
>  
> One solution may be to adapt the algorithm used to generate temporary 
> GRUUs. A second option, which is perhaps simpler, is to simply state in 
> outbound that the UAC MUST use identical Contact URIs when registering 
> multiple flows (in section 4.2), and that the authoritative proxy MAY 
> select any one of the registered Contact URIs to rewrite with (e.g. 
> needed to cover transitional cases where the UAC obtains a new IP 
> address and starts re-registering)
>  
> Regards,
> Jeroen
>  
>  
> 
> 
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> 
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