[OpenSIPS-Users] PRACK response to 183 without SDP

[solarmon]

H Ovidiu

We do not want our system to change to a 'ringing' state, which would
happen if it receives 180. We would like to drop the first 183 (without
SDP) but reply back with an PRACK (since 100rel was sent) and let the
subsequent 183 (with SDP) through. This is just a quirk in our system that
we are looking to find a workaround for.

I don't think removing 100rel from the INVITE would work? The sender of the
INVITE has put in 100rel and is expecting a PRACK, so us removing it does
not change this expectation?

Thank you.

On Mon, 18 Jan 2021 at 19:03, Ovidiu Sas <osas at voipembedded.com> wrote:

> You can change the 183 into an 180 and let the prack take its course.
>
> Alternatively, you can remove 100rel from the initial INVITE and drop the
> 183 without SDP.
>
> -ovidiu
>
> On Mon, Jan 18, 2021 at 11:05 solarmon <solarmon at one-n.co.uk> wrote:
>
>> Hi,,
>>
>> I have a requirement to stop 183 without SDP packets from being passed,
>> as well as having to reply back with a PRACK.
>>
>> I can stop the 183 without SDP from being passed on with the following in
>> onreply_route[]
>>
>>  if ($rs == "183" && !has_body_part("application/sdp")) {
>>                 drop();
>>                 exit;
>>         }
>>
>> However, how do I reply back with a PRACK?
>>
>> Thank you.
>> _______________________________________________
>> Users mailing list
>> Users at lists.opensips.org
>> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>>
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