I have a 112 dect system that has been working with a 250 system. The customer lost or broke the original handset and I'm adding a couple of new handsets. I cannot get the handsets to register to the base. I have the new handset programmed and set the IPIE for the handsets. I put the handsets in register mode and ticked both handsets in the Extension screen and click on the "register handsets" button. The handset will not register
I attached snips of the extension and handset screens.