Hi All I have Dinstar GSM gateway and configured like in this how to -> http://wiki.freeswitch.org/wiki/Dinstar_GSM_gateway_FreeSwitch_HowTo Everything works well except when calling from an IP phone to a mobile phone and mobile phone dropps the call. Freeswitch does not understand the BUSY signal and calls again sending INVITE and making new call to mobile phone. Hare is SIP debug http://pastebin.freeswitch.org/19539 BTW: in Freeswitch 1.1-beta I not observed this problem Dinstar with Asterisk works fine, so problem i think not in Dinstar gateway. Saulius