Hello It is possible to connect audio to the soundcard, on a PC by the function: PJSUA-API Media Manipulation, pjsua_conf_connect (pjsua_conf_port_id source, pjsua_conf_port_id sink). Is it also possible to connect one audio channel, to the one channel in the soundcart, and another audio channel to the other channel in the soundcard. Best Regards Kresten Tolstrup