We have just installed 3 Motorola SM56 PCI Speakerphone modems on our Dell Poweredge 6300 server running NT 4 SP5. The modems were recognized by NT and associated with COM3 thru' COM5. When we try to test the modems using 'Programs/Accessories/Phone Dialer' it reports "Another program is using this Telephony device. Try again after the other program completes". When we use 'Programs/Accessories/HyperTerminal' and enter a phone number then click on 'Dial' the Connect Dialog shows the modem name correctly but the status is shown as "Disconnected".
No other program is using the modems (as far as we know!)