Hi, Since I'm using the new sound device API, pjmedia_endpt_create() actually fails when it doesn't find any sound devices while starting the sound subsystem with: Found no audio devices (PJMEDIA_EAUD_NODEV) Is this intended behaviour? I would like to be able to use PJSIP on a system without sound devices as well with a null sound device (null port + master port). Ruud Klaver AG Projects