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USB and on-board modems not cooperating

USB and on-board modems not cooperating

USB and on-board modems not cooperating

I have Hayes Accura ISDN Modem which I connect to my laptop (XP Pro (SP1)) via. a USB port.  Everything works well until I use the on-board 56k modem.

When I use my on-board 56k modem (not at the same time as the ISDN modem)
it behaves very erratically, often slowly and often disconnects within a couple of minutes of connecting!  If I  physically disconnect the ISDN modem from the USB port (after 'shutting it down' via the software, otherwise I get the famous BSOD), everything is ok with the 56k modem.

I don't want to have to remember to unplug my ISDN modem (which is a pain to have to do via the software) every time I use the 56k modem (which is v. frequently).

Is there any way that both modems can live in harmony?  Any help would be appreciated.  I have made sure that the latest modem drivers are installed.  


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