Take a step back, what type of phones are they using? Chances are they are using a base station with a bunch of cordless phones no?
The homeowner said that he will get that eventually. Right now it's just a regular phone plugged into the wall.
How many phone lines? Is the above statement correct?
Yes, there is only 1 phone line coming in to the premises. However, when I do the wiring, I will distribute that 1 phone line to 3 jacks in the house.
If only using 1 phone line, use the brown pair, so punch everyrthing like you would minus the brown pair. Wire nut all the brown ones together and tie that into the phone service..
Oh ok! I see where you're going with this.