Hi, I have asterisk configured for german ISDN and SIP. SIP only for intranet connections. In our office there is a snom 100 and a snom 200 phone. When I'm calling a (public) telephone number which is busy, asterisk chan_modem hangs. Busy is never indicated to the calling SIP phone. And afterwords, the ISDN-channel is busy for both directions. I.e. I have to shut down asterisk and restart it in order to make any further calls or receive calls - except internal SIP calls. I'm using asterisk 0.5.0 and SuSE Linux 8.2. Any ideas? Thanks for any hints! Roger.