[SR-Users] Ideas to reject a call due to RTPEngine failure when handling the 200Ok

[Patrick Wakano]

I know that, and if that happens for the initial INIVITE I can properly
fail the call with a 50X.
However when I am already dealing with the 200Ok, the options are very
limited and it is not clear to me what is the correct approach....

On Fri, 24 Jan 2020 at 09:16, Alex Balashov <abalashov at evaristesys.com>
wrote:

> If the RTPEngine fails to answer the offer or answer command, the SDP
> will be left unmodified.
>
> But of course, that will not result in a proper media path.
>
> On Fri, Jan 24, 2020 at 09:01:25AM +1100, Patrick Wakano wrote:
>
> > Hello list,
> > Hope you all doing well!
> >
> > I have a setup of Kamailio + RTPEngine (so no B2BUA), and I've come to a
> > situation which I can't really figure out the best decision.....
> > The case is a late SDP negotiation that the 200Ok with the SDP offer
> fails
> > to engage the RTPEngine (for example no RTPEngine available). Also, the
> > same problem can happen with a normal SDP negotiation, in case the INVITE
> > goes through normally but then when engaging the SDP answer for the
> 200Ok,
> > the RTPengine answer request fails for any reason...
> > In these cases, I can't generate a proper SDP for the 200OOk so the call
> > will connect normally, but the media path will be broken...
> > So for such cases, I am thinking it is reasonable to fail the call.
> > However, failing a call during the 200Ok stage is tricky, at this point
> we
> > can't convert the 200Ok to a 50X. I tried and Kamailio doesn't allow and
> > also RFC wise this is a no no for a SIP proxy....
> > I could completely remove the SDP body and forward the 200Ok. This will
> > force a failed SDP negotiation and leave it for the endpoints the task to
> > terminate the call. Is that acceptable? Has anyone faced such situation?
> > Any idea is much appreciated!
> >
> > Kind regards,
> > Patrick Wakano
>
> > _______________________________________________
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>
>
> --
> Alex Balashov | Principal | Evariste Systems LLC
>
> Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
>
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