[SR-Users] Stateless non200 ACK processing

[Daniel-Constantin Mierla]

Hello,

you can use t_relay() instead of forward() and that should get you
going. It is how most of the deployments are done out there.

I will have to check the specs if they refer to stateless or
transactional proxy.

As I said, a stateless proxy doesn't keep anything about the invite or
its responses when the ack is processed.

Cheers,
Daniel

On 20.12.18 17:15, Serge S. Yuriev wrote:
> Hello,
>
> It's must as per 8.1.1.7
> ===
> The branch parameter value MUST be unique across space and time for
>    all requests sent by the UA.  The exceptions to this rule are CANCEL
>    and ACK for non-2xx responses.  As discussed below, a CANCEL request
>    will have the same value of the branch parameter as the request it
>    cancels.  As discussed in Section 17.1.1.3, an ACK for a non-2xx
>    response will also have the same branch ID as the INVITE whose
>    response it acknowledges.
> ===
>
> I have seen successful calls made by colleague so definitely errors in
> my config or different version.
> I hope later this evening to see the differences between our scripts.
>
> On 20/12/2018 15:34, Daniel-Constantin Mierla wrote:
>> Hello,
>>
>> I haven't looked at specs: is there a requirement that the branch for
>> ACK of negative replies to be same as for INVITE for a stateless proxy?
>>
>> A stateless proxy forgets everything about the INVITE as soon as it
>> sends it out and start processing the next request.
>>
>> Eventually we can look at the code and see if we can use the same
>> algorithm to generate the branch value.
>>
>> Cheers,
>> Daniel
>>
>> On 19.12.18 22:31, Serge S. Yuriev wrote:
>>> Hello,
>>>
>>> Anyone?
>>>
>>> -- 
>>> Wbr, Serge via mobile
>>>
>>> 17.12.2018, 19:48, "Serge S. Yuriev" <me at nevian.org>:
>>>>
>>>> Hello,
>>>>
>>>> I'm trying to build pretty simple stateless proxy to stay between
>>>> gw and
>>>> softswitch. Most working properly but not for non200 ACKs.
>>>> For some reason softswitch not accepting my ACK.
>>>> Trace (note different branch in top Via for INVITE and ACK towards
>>>> switch)
>>>> https://pastebin.freeswitch.org/view/8f1433b0
>>>> Simplified script
>>>> https://pastebin.com/u9DTSqcS
>>>>
>>>> I'm pretty new to this so believe doing something wrong.
>>>>
>>>> -- 
>>>> Serge S. Yuriev
>>>> Senior VoIP engineer
>>>>
>>>>
>>>>
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>>>>
>>>
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>>
>> -- 
>> Daniel-Constantin Mierla --www.asipto.com
>> www.twitter.com/miconda  --www.linkedin.com/in/miconda
>> Kamailio World Conference - May 6-8, 2019 --www.kamailioworld.com
>> Kamailio Advanced Training - Mar 4-6, 2019 in Berlin; Mar 25-27,
>> 2019, in Washington, DC, USA --www.asipto.com
>>
>
-- 
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda
Kamailio World Conference - May 6-8, 2019 -- www.kamailioworld.com
Kamailio Advanced Training - Mar 4-6, 2019 in Berlin; Mar 25-27, 2019, in Washington, DC, USA -- www.asipto.com