IBM 715 P/N - 13H6715 - Manual (Page 35)

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PROBLEM Cannot connect to a DOS modem and fax application
CAUSES/SOLUTION If the CONFIG.EXE tests passed, then the modem and fax software IRQ
setting assigned to the COM port might not match the the IRQ setting
selected by the CONFIG.EXE program. Run your DOS modem and fax
software and change the IRQ setting for the COM Port to match the IRQ
setting listed in the configuration program.
PROBLEM Can not receive or send a fax in a Windows application
CAUSES/SOLUTION If the CONFIG.EXE tests passed, the IRQ setting assigned to the COM
port might not match the IRQ setting selected by the configuration
program. Access the Control Panel, double-click the Ports icon and use
the selected COM Port Advanced Settings to change the IRQ setting for
the COM Port to match the IRQ setting selected by the configuration
program.