I use the function pjsua_set_snd_dev. All is fine but after this call, in the app_init function, I see my audio driver start to manage audio frames even if the audio is not active. Only after a sip call or after a ringback play, the audio is closed and the audio driver stops the play and rec of audio frames (until the next call happen). Now I see the function pjsua_set_snd_dev opens the sound to test the supported frequency but it does not close it. Is it correct? In any case I wonder about the best way to tell the audio driver to stop after the init. Sometimes it happen to me to have no audio in the first call. I am not sure but I suspect the problem is here. thank you mario -- -------------- next part -------------- A non-text attachment was scrubbed... Name: raffin.vcf Type: text/x-vcard Size: 266 bytes Desc: not available URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20120927/2119b1a4/attachment-0001.vcf>