Ross Barkham sent me this and it works well.
Unzip the file, dump the contents into your modem scrips directory:
Macintosh HD > Library > Modem Scripts.
Then pair the 750v and mac. Follow the options, when you get to choosing the modem for internet dialling, choose the file you've just dumped into Modem Scripts and then complete the setup wizard.
Works perfectly for me.
Adam