We have Wingo and the Wingo Internetbox 2 and would like to use VoIP. Wingo writes the following: To use Wingo landline, you need an analogue or IP telephone device. The telephone must be connected to the Wingo Internet Box via (RJ45 for IP telephone devices). My question: does this phone have an RJ45 connection? If not, which Gigaset phone do I need to buy? Thank you for your answer.