@miconda Hi, yes, all ok with https://github.com/kamailio/kamailio/commit/3fddccd0d7a3f9662699f88d1a9a708e... . the problem was how we obtained the existing `xavp's` and adding new values. this part `xavp = list ? &list->val.v.xavp : &new_xavp;` did the trick, we were adding values to xavp list and not to reg_xavp_rcd xavp.