Re: [sipcore] About SUBSCRIBE method's performance and Out-of-Dialog notification suggestion:

[[e-mail]]

Hi Christer,

> 1. I assume the SUB sender would still need store some data, in 
> order to match the out-of-dialog NOT to the previous SUB dialog?

By my primary thinking, I'd like this feature Event Package specific, that 
is some Event Packages which have the requirement could send notification 
out-of-dialog. 

Further, I think some Event Packages might need matching mechanism, some 
migt cut it out.

But I think the matching mechanism is not the so heavy here, as the most 
memory usage is for Route Set. This heavey part could be saved while we 
use notification out-of-dialog.

> 
> 2. If 1 is true, for how long would the SUB sender keep this data, 
> and be prepared to receive the out-of-dialog NOT? I guess the 
> subscription timers don't apply in this case, or?

I think this could be defined Event Package specific too.

> 
> 3. Would the out-of-dialog NOT be routed using a Contact/GRUU, 
> rather than the AOR, of the SUB sender, to ensure it reaches the SUB 
sender?

To be honest, my proposal is row now, and I hadn't think this point.
I agree that considering a specific heavy SUBSCRIBE usage, the 
"out-of-dialog" suggestion might not save impressive resource. But 
considering general usage, I think it would be meaningful.

Thanks,

Gao


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