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> I can use these modems and the fax software on a PC that comes with > these modems and all works. I can even put in the old modems w/o making > any changes using the PC software and all works...quite frustrating. This is very disappointing indeed. You really should try working with MultiTech support - without having a copy of the modem, I can't do much. Probably, your PC package is using the modem in Class 1. Before trying to work with MultiTech, be sure to have a log made with the modem command tracing enabled. You'll get some mileage out of explaining to them that your system worked with the old model, but there's a problem with the new one. My only other suggestion is to exchange the modems for the MT5600ZDX. I have one, and it works. Probably only the flow control commands have changed - I would leave the ModemSetupAACmd and especially the ModemRecvFillOrder as before.