I am looking into Vodafone Easy Office, and would like to know if anyone has successfully configured an analogue telephone adapter to work with it instead of using the supplied Vodafone router?

At work, we have a combo ADSL/3g router that automatically switches to 3G when the ADSL connection goes down.  If we are going to seriously look at Easy Office, I would need to know that I can use it with the current router, and the VOIP lines will work over 3G.