The MIFM card should be inserted into slots 1 or 2 for the modem to work. Also the extn number for the modem cannot be used or programmed anywhere else within the system except for memory block 1-8-38 and if you use DID tables
(1-1-22) make sure it is programmed there as well for day and night. If the MIFM card is also used for local/serial connection, make sure that you are not currently connected while trying to dial in or you will find that the modem rings out. One last thing, you cannot dial the modem number via an internal extn or SLT as you will get error/busy.
Jesse
PABX Sales and Service