Avaya Partner 18 Connection Manual page 302

Appendix B: PC Serial Ports
Windows to monitor IRQ5 rather than IRQ4 for the COM3 serial port – this is
accomplished using the Windows Control Panel under the "Ports" option (see
your Windows documentation for details).
If you attempt this solution, you must be certain that you do not choose an IRQ
which is in use by some other device in your system – if so, you will only trade
one type of IRQ conflict for another. You should be aware that many common
add-in cards use IRQs, including network cards and multimedia sound cards,
both of which are commonly used under Windows. Your PC hardware vendor
can assist you in configuring IRQs. You may also need to consult the
documentation for your PC and any add-in cards which are installed to
determine which IRQs, if any, are available on your system.
B-9