This is qa0309 (haven't tried earlier RH7.0.x beta). I have a Teles 16.3C PnP card. Initialized with isapnptools (which unfortunatially not are installed as default), irq=11 and io=0x580 are most often ok values for theese cards. BUT: It's not possible to change the cards io and irq in isdn-config - the default values are used anyway, so "modprobe" will fail if you have to do that. (And - you _will_ have to do that with my card!) "modprobe hisax type=14 io=0x580 irq=11 protocol=2" works.
It's fixed with internet-config-0.39-1. you will find it later in the next rawhide release.