It's normal to have this symptom. Some tips on configuring communication software. Following is a general guideline to the device type you should choose. For modem device type, choose 'Hayes V.32' or 'Hayes Compatible' modem. For the baud rate. choose 115,200 bps.
Many communication software use the modem response to control program flow.
Set your software to use either hardware or software flow control. If set to none, the communication software will not be able to detect a buffer overflow and result in transmission errors. For fax device type, choose 'TR29 Class 1'. For fax speed, choose 'automatic' or 'fastest speed'. Make sure that you have correctly set all the other parameters required by the software to operate successfully.