I was ready to install a filter on my incoming line until I took a closer look at my wiring. Downstairs phones are connected to the jacks with 2 white/blue wires. Upstairs phones have 2 sets of wires: 1 white/blue, one white/orange for a total of four connections! I have seven phones in the house, all the same line by the way. So what set of wires doesn't get the filter? The DSL modem would go upstairs, but if I disconnect white/orange from the terminal block, I run the chance of losing all three upstairs phones, right?
The house was wired over 30 years ago. What I don't understand is the terminal block appears to have seven sets of wires going into it for the seven phones; but only white/blue and white orange are being used. I tested this with a tone generator. So what are my options? Put filters on every phone? Or disconnect jack where modem will be and replace with CAT 5 wiring? Or disconnect white/orange and replace that with one of the other colors on the terminal block not being used? Needless to say I'm more confused than when I started. Any suggestions are welcome. Thanks!

The telephone company usually wires a house for two lines even though only one is being used at that time.
I would suggest that you just install a filter for each phone. I'm sure your DSL company will provide you with more filters, if you don't have enough.

Can I then at least connect 4 wires where the modem will be with four of the unused wires? DSL uses 4 wires, right? I mean if I have a gray/red and an orange/white that are not being used I can disconnect the existing wires from the jack and connect the ones I mentioned above, right?

I think you are confusing the DSL signal with the ethernet signal. The DSL signal travels over the phone lines and uses the same 2 wires as the phone. Ethernet uses two pairs (4 wires). If you are thinking of
routing the phone snd DSL signal and the ethernet signals in the same cable it can be done with the right cable and if the right pairings are available. Best practice is to route them in separate cables.

Let me explain a little further. My house has seven telephone jacks. Downstairs, inside each jack, there is 2 terminals connected with white/blue wires; upstairs, inside the jack there are four terminals connected with white/blue and orange/white wires. Now the terminal block in the basment has different colored wires attached to it but only the white/blie and orange/white are actually being used. What I'm proposing is this: disconnecting the four wires that go to the jack where the modem will be and connecting two wires which currently are not being used. This will isolate the jack with the modem. All the rest of the lines can be filtered but this one will not be. Make sense? or am I totally off base?

Yes you can use another pair for the jack for the modem only. Apparently the upstairs jacks (those with the orange/white connected were wired RJ-12 for use with a two line phone. If this is a continuation of your earlier post then I am asuming that you intend to use only one filter.

Yes, I am going to use only one filter on the incoming line. Thanks to everyone for responding. I now have a clearer picture of what needs to be done.

cyberdude,,you may have already answered your own question,,but here goes..i worked on dsl for 9yrs..since you have w/blu and w/ora going to all your jacks,,your voice will stay on the w/blu all through the house,,if you can get the w/ora from the box to the upstairs jack where your modem is then that may be ok if your dsl modem will work ok..that being said,,if the wiring is 30yrs old like the house then personally i would run a cat5 cable up to the upstairs where the modem sits which is what i did and screw the rest..i personally ran cat5e to all my jacks with a dsl spliter that splits the voice and data at the box outside and all is perfect..hope this helps