I've find out that the desired function has been exported via API to other modules here (I am using kamailio source from tag 4.3.5): https://github.com/kamailio/kamailio/blob/4.3/modules/uac/api.h#L8 The function obviously didn't have any arguments so how should 'create' the SIP message I want to send from my custom module? In the kamailio.cfg (see previous email) there is need to create some pseudo-variable which this function parses automatically but I am not sure how I can create such a pseudo-variable in custom module and then pass it somehow to exported function ( https://github.com/kamailio/kamailio/blob/4.3/modules/uac/uac_send.c#L758). `_uac_req` which seems to be used in `uac_send` seems to be static and inaccessible from another modules ( https://github.com/kamailio/kamailio/blob/4.3/modules/uac/uac_send.c#L75). Any ideas? On Sat, Apr 16, 2016 at 8:35 PM, Cockhootec Yahrabee <cockootec(a)gmail.com> wrote: