[SR-Users] suppress t1 timer retransmissions?

Henning Westerholt hw at gilawa.com
Tue Oct 11 08:37:31 CEST 2022 

Hello,

obvious answer, fix the user agent to behave according to the standard. But as you mentioned, it might be not easy right now. 😉

You could switch to synchronous http client and just use sl_send_reply. Or you could decrease the transaction timer to at least limit the number of retransmits you get.

Cheers,

Henning

-- 
Henning Westerholt – https://skalatan.de/blog/
Kamailio services – https://gilawa.com

-----Original Message-----
From: sr-users <sr-users-bounces at lists.kamailio.org> On Behalf Of Brooks Bridges
Sent: Tuesday, October 11, 2022 12:23 AM
To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
Subject: Re: [SR-Users] suppress t1 timer retransmissions?

Correct.  This is an http interface for getting data, and the UAC is doing dumb things where it's sending an invite, then an ACK 2ms later, and then waiting on the response.  It never replies to the response, so the proxy retransmits several times which overloads the requesting system.

I'm trying to find a way to make t_reply() act like sl_send_reply() when sending a message and do not retransmit if it doesn't get an ACK.

Brooks Bridges
1200 S. Rogers Circle, Unit 6
Boca Raton, FL 33487
Office: 916-235-2097 Main: 888-444-1111
email: bbridges at call48.com  | web: www.call48.com


-----Original Message-----
From: sr-users <sr-users-bounces at lists.kamailio.org> On Behalf Of Alex Balashov
Sent: Monday, October 10, 2022 14:52
To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
Subject: Re: [SR-Users] suppress t1 timer retransmissions?

Oh, I see. You mean you don’t to forward retransmitted replies from upstream?

> On Oct 10, 2022, at 5:47 PM, Brooks Bridges <bbridges at call48.com> wrote:
>
> I'm not sure I follow how that would behave differently?  The transaction already exists as it's a result route for a suspended http_async_client request, the problem is that the far side is not responding correctly, so I end up with several retransmissions when I try to reply with a message.
>
> Brooks Bridges
> 1200 S. Rogers Circle, Unit 6
> Boca Raton, FL 33487
> Office: 916-235-2097 Main: 888-444-1111
> email: bbridges at call48.com  | web: www.call48.com
>
>
> -----Original Message-----
> From: sr-users <sr-users-bounces at lists.kamailio.org> On Behalf Of Alex Balashov
> Sent: Monday, October 10, 2022 14:43
> To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
> Subject: Re: [SR-Users] suppress t1 timer retransmissions?
>
> Might this be what you’re after?
>
> https://kamailio.org/docs/modules/5.6.x/modules/tm.html#tm.f.t_send_reply
>
> — Alex
>
>> On Oct 10, 2022, at 5:37 PM, Brooks Bridges <bbridges at call48.com> wrote:
>>
>> So I have a very odd situation that requires me to suppress retransmissions when using t_reply() to send a response back to a UAC that is horribly broken but I'm stuck with for the time being.  In the previous iteration of this platform it was fine since I was using a stateless reply, so even though it wasn't "right" it still worked out.  I need to replicate this behavior in the event route for http_async_client(), which prevents me from being able to use t_release().
>>
>> Anyone have any clever ideas?
>>
>> Brooks Bridges
>> 1200 S. Rogers Circle, Unit 6
>> Boca Raton, FL 33487
>> Office: 916-235-2097 Main: 888-444-1111
>> email: bbridges at call48.com  | web: www.call48.com
>>
>>
>> Confidentiality Notice: This e-mail, and any attachment to it, contains privileged and confidential information intended only for the use of the individual(s) or entity named on the e-mail. If the reader of this e-mail is not the intended recipient, or the employee or agent responsible for delivering it to the intended recipient, you are hereby notified that reading this e-mail is strictly prohibited. If you have received this e-mail in error, please immediately return it to the sender and delete it from your system.
>>
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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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> Important: keep the mailing list in the recipients, do not reply only to the sender!
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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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