Thank you Jacques Actually I didn't hear modem whistles sound in Ubuntu while I heard it in Windows. May be ALSA setting hasn't completed? -----Original Message----- From: Jacques Goldberg [mailto:Jacques.Goldberg@xxxxxxx] Sent: Wednesday, October 24, 2007 11:12 AM To: Robikhun (robihun) Cc: Linmodems Subject: Re: slmodemd NO CARRIER error Robikhun, The whistles which you hear when starting the modem are the negotiations about the best speed for the two connected modems. They do not always succeed, and IN PARTICULAR if for whatever reason any segment of the telephone line is wireless such as radio instead of cable to reach small remote areas such as islands. The difference between the Linux and Windows modem speed setting is most often due to different driver code. Jacques