[bigmutt]

Thanks for your replies and your continued interest in helping me.

My provider is InPhonex and also SIPphone. I have tried getting help from both, but ultimately they blame the equipment (either the F1000 or my ISP). UTStarCom assures me it's not the fault of their equipment, although it was almost impossible to get anything from them in the way of help: they do not provide customer tech support !
My ISP checked out ports etc and assured me no ports were being blocked.

So I think it's back to a settings problem, but I can't get either Voip provider to help beyond a general setup scenario.

Frankly I've given up, after spending dozens of hours trying to get this to work. If any one is interested in buying this F1000 I'll sell it at a great loss and write it off to my stupidity for not determining first if the manufacturer would stand behind the product before I bought it.

Thanks.