Hello list, I'm pretty new to Asterisk, but so far I managed to setup the server, added a couple of mISDN channels (one TE, one NT), connected to a VOIP provider and called out to the World :) Now I started to play with codecs because I wanted to try the sound quality of each of them, and something weird happens. My setup is to check one codec at a time, so I disallow all, then allow one. In iax.conf: [general] disallow=all allow=ilbc [channeldefs...] Now when I try to call, the VOIP provider sets the connections through (i.e. my phone is ringing), but once I lift the receiver, the VOIP provider hangs up the connection: mISDN---> Asterisk --> VOIP provider --> POTS ringing Once I lift the POTS handset, the connection between VOIP provider and POTS closes (so I only hear a busy tone). What could be happening here? Best regards, Valentijn -- http://www.openoffice.nl/ Open Office - Linux Office Solutions Valentijn Sessink valentyn+sessink@nospam.openoffice.nl