I spent the last week to figure out why i cannot attack a wav file to a conference bridge and found out, that pjsua_conf_connect requires a samplerate library which may be the supplied third party library resample or an external library (libsamplerate). The debian rules configure flags lack of a valid samplerate conversion library since it has been disabled using "--disable-resample" and not including " --enable-libsamplerate" which is a well maintained lib on debian. After patching the rules file and add the --enable-libsamplerate flag as well as adding libsamplerate0-dev to the build dependencies in the control file, the problem's gone and i'm able to connect tones or wav ports to the conference bridge ! Wonder why someone could have managed to connect ports to a conference bridge without using a sample rate conversion library though ! Best regards Franz