hello use function: pjsua_set_null_snd_dev() parameters in pjsua_init are optional see: http://www.pjsip.org/pjsip/docs/html/group__PJSUA__LIB__BASE.htm#g72ccd5cc7dbf6f26b4ffedc0d9728a2d and see at example: pjsua_app.c there are informations that should help you > Hello, > > I set NULL also Default. But i get same error. > > Code: > ==== > pjsua_media_config media_cfg; > pjsua_media_config_default(&media_cfg); > ... > status = pjsua_init(&cfg, &log_cfg, &media_cfg); // tried NULL too > if (status != PJ_SUCCESS) error_exit("Error in pjsua_init()", status); > > > Error: > ==== > 14:08:58.485 tsx0x9512664 State changed from Null to Calling, > event=TX_MSG > 14:08:58.485 pjsua_acc.c Registration sent > 14:08:58.485 pjsua_media.c Error retrieving default audio device > parameters: Unable to find default audio device (PJMEDIA_EAUD_NODEFDEV) > [status=420006] > 14:08:58.485 APP Error making call: Unable to find default > audio device (PJMEDIA_EAUD_NODEFDEV) [status=420006] > 14:08:58.492 pjsua_core.c Shutting down... > 14:08:58.492 pjsua_pres.c Shutting down presence.. > 14:08:58.492 pjsua_media.c Shutting down media.. > > > > Please advise. > > Thank you > Regards