[Kamailio-Users] re-invite mid call?

[Antonio Goméz Soto]

Op 01-01-10 17:54, Alex Balashov schreef:
[ .. ]
>
> The question you are asking is a technical one, but the answer is really
> philosophical and conceptual one (i.e. in terms of how RFC 3261 defines
> various types of SIP elements). Is it theoretically possible to add some
> hacks to a SIP proxy to make it behave as something other than a proxy
> by spoofing messages in a convincing way? Yes, it is - with enough
> ambition; in fact, Kamailio has a number of such hacks internally, such
> as the dialog module's timeout attribute which can spoof a BYE in both
> directions after a certain amount of time has passed. But that's what
> they are - hacks. Useful, perhaps, but they are departures from what a
> proxy is supposed to do that break proxy purity.
>

Ok, i see what you mean.

> So, yes, you could hack the source to inject messages asynchronously.
> But when you do that, you no longer have a proxy, but something else, so
> it really comes down to (a) what you want and (b) what the product is
> intended to be. At the moment - several clever hacks notwithstanding,
> and some UAS functionality (e.g. registrar) notwithstanding as well -
> it's a proxy. As long as the intent of the product is to continue to be
> a proxy, it is largely limited to the sort of things a proxy can do,
> formally speaking.
>

And do you think the Kamailio maintainers oppose extending the
functionality in this direction?

> To do the kinds of things you're wanting to do in a way that is
> accommodated by the specifications and the protocol mechanics of SIP,
> what you're really looking for is something that can behave as a user
> agent in its own right.
>

Any suggestions (given the fact that it needs to accomodate a couple
of ten thousands of phones?)

Antonio