[OpenSIPS-Users] Stopping a T.38 reinvite with Opensips loose_route()

[Saúl Ibarra Corretgé]

On 03/06/2011 10:52 PM, Iñaki Baz Castillo wrote:
> 2011/3/6 Jeff Pyle<jpyle at fidelityvoice.com>:
>> Unfortunately the customer cannot disable T.38.  I'd like to be able to
>> reject the reinvite with a send_reply("488", "Not acceptable here") within
>> the loose_route() section.  Is this legit, or am I going to break things,
>> like getting the two endpoints' CSeqs out of sync?
>
> You are not going to break CSeq at all. The proxy is able to reject
> in-dialog requests depending on local policy. When the UA receives 488
> it does know that, in case of a new in-dialog request, it must use a
> greater CSeq, which of course will be valid in the other UA (it must
> be just higher than previous one, no matter how much higher).
>

What would happen if the other end sends a reinvite or other in-dialog 
request? It didn't get the reinvite, so it doesn't know it happened. 
Will OpenSIPS handle this situation as well? I'm not sure...

> But in your case, the problem is that when your UA receives the 488 it
> will probably send a BYE (it's the usual policy when a re-INVITE is
> rejected). But you can try it. You will not break SIP protocol at all.
>

Why? The RFC only states that if 481 or 408 is received the session must 
be ended, but for any other error it shouldn't be AFAIK.


Regards,

-- 
Saúl Ibarra Corretgé
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