Thanks Henning, the problem described in the issue 3090 <https://github.com/kamailio/kamailio/issues/3090> looks very similar to mine; I will organise myself to test the patch. Thanks, have a nice day Giovanni On Wed, Apr 27, 2022 at 7:47 PM Henning Westerholt &lt;hw(a)gilawa.com&gt; wrote: Hello,   did you also looked into this: https://github.com/kamailio/kamailio/issues/3090   There is a commit references in the issue, in case you want to test it.   Cheers,   Henning   -- Henning Westerholt – https://skalatan.de/blog/ <https://skalatan.de/blog/> Kamailio services – https://gilawa.com <https://gilawa.com/>   *From:* sr-users &lt;sr-users-bounces(a)lists.kamailio.org&gt; *On Behalf Of *Giovanni Tommasini *Sent:* Tuesday, April 26, 2022 7:51 PM *To:* Kamailio (SER) - Users Mailing List &lt;sr-users(a)lists.kamailio.org&gt; *Subject:* [SR-Users] TOPOS, 183 (before a 200OK) and SIP INFO   Hi kamailiers,   I ask your help for a strange situation with topos, 183 (before a 200OK) and SIP INFO   My topology is kamailio in front of asterisks; so kamailio has 2 interfaces (1Public to talk with customers and carriers and 1 Private to talk with asterisk). In the image: - the first column is the customer - the second is the public interface of kamailio - the third is the private interface of kamaiio - the fourth is asterisk   As you can see in the image, the customer send an INVITE and the carrier give back the IVR messages in a 183 (before a 200OK) asking for an IVR selection. The customer (configured to use SIP INFO) types a key and sends in INFO, but as you can see kamailio sends the INFO to himself to private interface instead of sending it to asterisk as if the contact that handled topos contained incorrect information.   - If the customer is configured with a RFC2833  - or if the IVR messages is not in a 183 but is sent after a 200OK  - or if I disabe TOPOS *all works fine*   I used kamailio 5.5.3, I also try to upgrade to 5.5.4 but nothing change   Maybe could be connected with  https://github.com/kamailio/kamailio/issues/2344 https://github.com/kamailio/kamailio/issues/1077   Could be a kamailio bug for this particular situation or am I getting lost in a glass of water?   thanks a lot cheers Giovanni Tommasini *evoseed s.r.l.*    **phone:  +39 340 11 28 800      mail:  giovanni.tommasini(a)evoseed.io       site:  evoseed.io <http://evoseed.io> address:  Via Lucrezio 13, Trieste Italy   __________________________________________________________ Kamailio - Users Mailing List - Non Commercial Discussions * sr-users(a)lists.kamailio.org Important: keep the mailing list in the recipients, do not reply only to the sender! Edit mailing list options or unsubscribe: * https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users