[Kamailio-Devel] Implrementing draft-sparks-sip-invfix-03 (default behaviour)

[Alex Balashov]

I think this gets back to an issue often raised by Bogdan in OpenSIPS 
land, which is that the traditional way of doing things with OpenSER is 
historically a mix of stateful and stateless relay -- something that has 
some unusual and sometimes undesirable repercussions.

Iñaki Baz Castillo wrote:

> El Martes, 17 de Marzo de 2009, Alex Balashov escribió:
>> I think the real question is what the adoption status of this draft is,
>> and whether it will break interop.
> 
> A stateless proxy should of course forward replies statelell (with no 
> transaction), but a statefull proxy doesn't need to do it at all.
> 
> A stateful proxy decides to work in stateful mode, so it creates transactions 
> to send the requests and it expects that replies would belong to these 
> transactions. If not, these responses are not useful at all.
> 
> Please note that while RFC 3261 allows a stateful proxy ruting stateless 
> replies with no transaction, the mentioned draft discourages it totally since 
> it can be used by an attacker. AFAIR there are no interop issues (you are the 
> proxy, you can decide to disallow stateless routing safely).
> 
> Regards. 
> 
> 


-- 
Alex Balashov
Evariste Systems
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