Hi Enrico, Are you calling it in conjunction with rtpengine? maybe this can help you: https://lists.kamailio.org/pipermail/sr-users/2015-August/089434.html Daniel On 07/05/2018 02:02 PM, Enrico Bandiera wrote: Hi, I'm encountering an issue where calling keep_codecs_by_name does not modify the SDP on the INVITE unless I call the "evil function" msg_apply_changes Any help is welcome, Thanks, Enrico. _______________________________________________ Kamailio (SER) - Users Mailing Listsr-users@lists.kamailio.orghttps://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users _______________________________________________ Kamailio (SER) - Users Mailing List sr-users(a)lists.kamailio.org https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users