Re: PJSIP and Preconditioning (UPDATE prior to 200 OK on INVITE)

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Hi,

is there any proper way to report bugs? I haven't found a way, to open
a ticket on the bug-tracker.... nor to create an account, in order to
do so.

Thanks,
Carsten
--

Carsten Bock
CEO (Geschäftsführer)

ng-voice GmbH
Millerntorplatz 1
20359 Hamburg / Germany

http://www.ng-voice.com
mailto:carsten@xxxxxxxxxxxx

Office +49 40 5247593-40
Fax +49 40 5247593-99

Sitz der Gesellschaft: Hamburg
Registergericht: Amtsgericht Hamburg, HRB 120189
Geschäftsführer: Carsten Bock
Ust-ID: DE279344284

Hier finden Sie unsere handelsrechtlichen Pflichtangaben:
http://www.ng-voice.com/imprint/


2018-02-20 17:31 GMT+01:00 Carsten Bock <carsten@xxxxxxxxxxxx>:
> Hi,
>
> i've identified a bug in PJSIP (and thereby in Asterisk 13):
>
> Scenario:
>
> UA calling to PJSIP
> ---> INVITE (in SDP: a=inactive)
> <--- 183 Session Progress (in SDP: a=inactive)
>
> (some conditions are met [a dedicated bearer on LTE is activated], so
> the UA will activate the Audio-Stream by sending an UPDATE-Request)
>
> ---> UPDATE (in SDP: a=sendrecv)
> <--- 200 OK (to the UPDATE, in SDP: a=sendrecv)
>
> What happens now, is wrong:
>
> <--- 200 OK (to the INVITE, in the SDP: a=inactive)
> ---> ACK
>
> The 200 OK should be "a=sendrecv", since the original session was
> activated/updated by the "UPDATE" request.
>
> After digging through the code of chan_pjsip/Asterisk, I've found that
> it's actually a bug in PJSIP and not in Asterisk. Asterisk indicates,
> that the call is hold during INVITE and upon UPDATE, it indicates that
> the call was reactivated.
>
> Currently, I replace the a=inactive with a=sendrecv in the 200 OK on
> Kamailio-Proxy, but that's more a dirty hack than a proper fix.
>
> I've verified the behaviour with Asterisk and the pjsip-ua from the
> samples folder (both Version 2.7.1).
>
> Thanks,
> Carsten
> --
> Carsten Bock
> CEO (Geschäftsführer)
>
> Meet us at MWC 2018 in Barcelona and see IMS and VoLTE in action!
> (February 26th - March 1st, Hall 7 - Booth 7L80)
>
> ng-voice GmbH
> Millerntorplatz 1
> 20359 Hamburg / Germany
>
> http://www.ng-voice.com
> mailto:carsten@xxxxxxxxxxxx
>
> Office +49 40 5247593-40
> Fax +49 40 5247593-99
>
> Sitz der Gesellschaft: Hamburg
> Registergericht: Amtsgericht Hamburg, HRB 120189
> Geschäftsführer: Carsten Bock
> Ust-ID: DE279344284
>
> Hier finden Sie unsere handelsrechtlichen Pflichtangaben:
> http://www.ng-voice.com/imprint/

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