User guide

Chapter 6 Troubleshooting
Multi-Tech Systems, Inc. MT9234ZBA-Series User Guide 29
The Modem Doesn’t Work with Caller ID
Caller ID information is transmitted between the first and second rings, so if autoanswer is turned off (S0=0)
or if the modem is set to answer after only one ring (S0=1), the modem will not receive Caller ID
information. Check your initialization string, and if necessary change it to set the modem to answer after the
second ring (S0=2).
Make sure that you have Caller ID service from your telephone company.
Fax and Data Software Can’t Run at the Same Time
Communication devices can be accessed by only one application at a time. In Windows 2000 and higher, you
can have data and fax communication applications open at the same time, but they cannot use the same
modem at the same time.