Your English is much better than my French
Unfortunately most modems just aren't compatible with the AnywhereUSB. We have discovered that hardware (controller based modems) will usually work and also our Rapidport modem will work as well.
If you're stuck using this modem, unfortunately there won't be anything we can do to just make it work.
Are you able to use a different modem? If so, I would suggest the Best Data USB 56K controller based modem. We have had much success with customers using this on the AnywhereUSB