Hello Bogdan, In my case, ACK for previous INVITE has already been received by OpenSIPS, but not sent yet. In this case, will the variable $DLG_status still equals 3 ?
Thanks On Sun, Feb 5, 2017 at 11:15 AM, Bogdan-Andrei Iancu <bog...@opensips.org> wrote: > Hi Stas, > > Such races may happen at application level or even at network level (when > using UDP) - so if you have 2 packets very close as time, they may swap. > That is SIP :) > > The full guilt is in the UAC device, IMHO - it should let some time gap > between the ACK and re-INVITE, to eliminate any possible races. > > Now, what you can do is to use the dialog module and to check the dialog > state when receiving the re-invite. If $DLG_status is *3* (Confirmed by a > final reply but no ACK received yet), drop with no reply the re-INVITEs (to > force a later retransmission) : > http://www.opensips.org/html/docs/modules/2.2.x/dialog.html#id297400 > > Regards, > > Bogdan-Andrei Iancu > OpenSIPS Founder and Developerhttp://www.opensips-solutions.com > > On 02/02/2017 10:31 PM, Stas Kobzar wrote: > > Hello List, > > My call flow has initial INVITE and re-INVITE to update RTP IP/port. > Usually everything works well, but sometimes OpenSIPS come up with > following example: > > UA OpenSIPS PSTN GW > ------------------------------------------- > INV(CSeq: 100) -----> | ---> INV(CSeq: 100) > <---- 200 OK | <--- 200 OK > > (UA sends ACK then new INVITE) > > ACK(CSeq: 100) -----> | > reINV(Cseq: 101) ---> | > > (OpenSIPS relays first INVITE then ACK) > | ---> reINV(CSeq: 101) > | ---> ACK(CSeq: 100) > > When PSTN gateway receives re-INVITE before ACK for previous INVITE > it responds 500 with Retry-After header. > This is correct behaviour which conforms to the RFC 3261 section 14.2 > > My question is: > Is it possible to assure order of received and relayed messages within the > same SIP session? Is there any configuration parameter? > > Thank you, > -- > > Stas Kobzar > > Developeur VoIP / VoIP Developer > > > Modulis.ca Inc. > > # Bureau / Office: 514-284-2020 x 246 <(514)%20284-2020> > > Email: s <http://firstname.lastname>tas.kob...@modulis.ca > > https://www.modulis.com > > > _______________________________________________ > Users mailing > listUsers@lists.opensips.orghttp://lists.opensips.org/cgi-bin/mailman/listinfo/users > > > -- Stas Kobzar Developeur VoIP / VoIP Developer Modulis.ca Inc. # Bureau / Office: 514-284-2020 x 246 Email: s <http://firstname.lastname>tas.kob...@modulis.ca https://www.modulis.com
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