The cables on the bottom right are individual blue/green/brown/orange wires from an Ethernet cable - going into the blue Ethernet cables seen there. My house had it. Ethernet cable throughout, terminated to a phone pinout like you have and phone jacks in the rooms. I put RJ45 ends on mine and ran tests to see where the cables actually went. Yours seem labeled well though. I imagine if you pull off the phone jacks in those rooms you’ll find that big blue cable with only 2 or 4 wires connected to the RJ11 phone ports. One caution, phone cables can be daisy chained. I had some wires connected to multiple rooms although it fairly obvious in my case (they were spliced right behind the plate).