Re: Error: ACK without matching transaction

Hi

I spotted this in one reply.
> assume your ACK is for a 2xx final response to INVITE (same Call-ID, same CSeq=2, To has a tag).
I think you're right that this is an ACK for a SIP-200 response, but
those three things would be true even for a negative ACK. What tells
me that this is an answered call is that the RURI and Via branch in
the ACK are different from those in the INVITE (with a different Via
branch, transaction matching can never work anyway).

I reply because I see that there's no Route header field in the ACK
request, which shows that RR is not being used. This may not be a
problem in the direction from WSS client to server (10.5.0.2:5060)
through the proxy, but you might find that BYEs or other requests in
the other direction won't work. If you test and they don't work, then
have a look at the documentation for the rr.so module.

James

On Wed, 27 Aug 2025 at 14:13, Sergio Charrua via sr-users
<[email protected]> wrote:
>
> Sounds Great!
>
> SIP reply messages and errors are divided into classes, where:
> - Class 1 or 1XX or range from 100 to 199, is information reply (ex.: 180 Ringing)
> - Class 2 or 2XX or range from 200 to 299, is a success reply (ex.: 200 OK - call answered)
> - Class 3 or 3XX or range from 300 to 399, is a redirection reply (ex.: 303 Redirect ... i think)
> - Class 4 or 4XX or range from 400 to 499, is request failure reply (ex.: 404 Not Found)
> - Class 5 or 5XX or range from 500 to 599, is server failure (ex.: 500 Server Failure)
> - Class 6 or 6XX or range from 600 to 699, is global failure (ex. 603 Decline)
>
> a good article to read more about the subject:
> https://en.wikipedia.org/wiki/List_of_SIP_response_codes
>
>
>
> Atenciosamente / Kind Regards / Cordialement / Un saludo,
>
>
> Sérgio Charrua
>
>
>
> On Wed, Aug 27, 2025 at 3:57 PM Fernando Lopes via sr-users <[email protected]> wrote:
>>
>> Thank you, it worked.
>>
>> What are 2xx (3xx-6xx) replies?
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