Express talk & usb express talk phone

stap

I have 2 usb phone. All work fine with express talk, but one of them don`t ring when calls come. Maybe somebody have that problem and can ask me what to do&

stap

I just use x-pro + express talk usb phone and now I have a ring now, but the ring don`t stop when another man finish calling .

Phone also work fine with Skype.

Please tell me why I can`t hear phone ring when use express talk?

P.S. I am going to buy express talk B.E.