Hi, I am trying to compile my first app using pjsip on Ubuntu Linux, but I am getting errors about undefined reference to 'pjmedia_aud...' all the references are to functions that start pjmedia_aud_ . It appears that all the functions are defined in pjmedia/src/pjmedia-audiodev/audiodev.c . Is it possible that for some reason the pjsip build did not include this file properly, maybe because I need to configure something else first. Can anybody tell me what I am doing wrong or missing ? Thanks, Neil Cherry