Phone Jackpoint wired with Cat5, but Modem requires RJ11

So in my new house the phone points on the wall are all wired to the central cable hub with cat5 data cables. The phone is supposed to go into Phone 1 jack (size RJ11 I believe) in the fibre modem. Is there any way to get this done?If you want to see the Phone 1 jack here is an image of the modem: Modem image - Google search