Hi, yes there's was a small typo that prevented answer to be detected into the channel driver. Please check the wiki (http://open.voismart.it) and try the 0-16beta1 version. matteo. -- Matteo Brancaleoni R&D Director Tel +39.02.70633354 Sip matteo at sip.voismart.it Iax2 matteo at iax.voismart.it