[OpenSIPS-Users] Fwd: Retransmission and 300 Redirect

[Pavel Eremin]

Many thanks for your advices.

Чт, 22 окт. 2020 г. в 18:44, Răzvan Crainea <razvan at opensips.org>:

> Hi, Pavel!
>
> I think you can play with the T1 and T2 timers[1] to avoid, or at least
> control better the re transmissions, however note that these settings
> affect all transactions, not just the INVITE transaction one you're
> targeting. TBH, I wouldn't do that.
>
> Another possibility would be to completely avoid re-transmissions is to
> go stateless (instead of using t_relay(), just use send() and the
> generic onreply_route).
>
> However, the best way to achieve this, is to fix the redirect_server to
> be able to either send a 100 Trying within a reasonable time, or at
> least be able to absorb re-transmissions.
>
> In order to make sure you're only processing a single 300 Redirect, you
> can use a flag that says whether the redirect was processed or not, and
> only reprocess it if the flag is not set.
>
> [1] https://opensips.org/docs/modules/3.1.x/tm.html#param_T1_timer
>
> Best regards,
>
> Răzvan Crainea
> OpenSIPS Core Developer
> http://www.opensips-solutions.com
>
> On 10/22/20 12:32 PM, Pavel Eremin wrote:
> >
> > Hi, community!
> > Is anyone can help me to understand how to avoid 2 situations:
> >
> > 1. I don't want to send retransmission  (INVITE) from "opensips" to
> > "redirect" server, even "redirect" does not answer.
> >
> > 2. If I have sent a few invites to "redirect" , then i will receive a
> > few 300 Redirect messages, and "opensips" will generate branches for all
> > contacts in all "300 Redirect" messages. how can i ignore all "300
> > Redirects".
> >
> > I am not sure that t_check_trans() can help me with that.
> > Thanks. I added a picture with the call flow I have.
> >
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> >
>
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