kamailio-docs/kamailio-kemi-framework/docs/modules/rtpengine/rtpengine.set_rtpengine_set2.md

This function is the sibling function to set_rtpengine_set(). The original module function is declared as set_rtpengine_set(setid[, setid2]).

In KEMI set_rtpengine_set() takes only the first parameter and set_rtpengine_set2() allows for the second optional parameter to be passed.

KSR.rtpengine.set_rtpengine_set2(2, 1);
KSR.rtpengine.rtpengine_offer();

Please review the documentation for set_rtpengine_set() for more information.