Multi-Tech Systems MT5634ZBAV - Manual (Page 32)

User Guide
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7. If the software has an autobaud selection, make sure it is disabled.
Autobaud applies only to older modems, and can cause problems if
enabled.
8. If the software allows you to edit the no-connect messages ( NO
CARRIER, BUSY, NO ANSWER, NO DIALTONE), make sure there
is no space between
DIAL and TONE in NO DIALTONE.
9. Refer to the software manual or online Help for other configuration
choices; in most cases you can accept the default values.