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

Paul Kyzivat <pkyzivat@cisco.com> Tue, 04 January 2011 21:08 UTC

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Date: Tue, 04 Jan 2011 16:10:49 -0500
From: Paul Kyzivat <pkyzivat@cisco.com>
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To: Christer Holmberg <christer.holmberg@ericsson.com>
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Subject: Re: [sipcore] About SUBSCRIBE method's performance and Out-of-Dialog notification suggestion:
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On 1/4/2011 3:54 PM, Christer Holmberg wrote:
> Hi,
>
> Stateful proxies also maintain state.

Sure. But generally *less* state.
For instance, often you could get by with just a transaction stateful proxy.

And is it really the state that is the problem? Or is it the message 
processing? There is potentially a lot more work per-message for a B2BUA 
than a proxy.

	Thanks,
	Paul

> Regards,
>
> Christer
>
> ________________________________________
> From: sipcore-bounces@ietf.org [sipcore-bounces@ietf.org] On Behalf Of Paul Kyzivat [pkyzivat@cisco.com]
> Sent: Tuesday, January 04, 2011 10:39 PM
> To: sipcore@ietf.org
> Subject: Re: [sipcore] About SUBSCRIBE method's performance and Out-of-Dialog notification suggestion:
>
> On 1/4/2011 12:13 PM, Worley, Dale R (Dale) wrote:
>> ________________________________________
>> From: DRAGE, Keith (Keith) [keith.drage@alcatel-lucent.com]
>>
>> The key here is to understanding what dialog state needs to be maintained, and the proposal as currently described does not seem to change that.
>> ________________________________________
>>
>> I suspect that the question is dialog state maintained in intermediate elements, as many SIP systems coming from traditional telco companies implement intermediate elements as B2BUAs, and often have up to a dozen B2BUAs in what would be expected in SIP to be a single dialog.  I expect Gao will clarify the question when his day arrives.
>
> If this is the issue, then it just points out the obvious - that there
> are consequences to using B2BUAs rather than proxies. If it hurts, don't
> do it.
>
>          Thanks,
>          Paul
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