Take the last statement first. This is new to me and the electrician is not a cable person. The blind leading the blind if you asked me.
Let's hope this is a low budget SOHO job, because using Vonage and running a single cable to each location, when you had the walls completely open is certainly not a good way to install voice and data cabling. The industry standard called for a minimum of TWO data cables per jack, btw, and you are now left to wish you had done just that.
Because Sparky installed your low voltage wiring, it's unlikely you could use the wires as pull wires to bring in a second cable, since he probably stapled the cables in place, but that's a surprise for you to find out later.
I'm guessing that this is 6 jacks or less. If it were my mess to clean up, I'd probably look to get a 12 or 24 port patch panel for the head end, and a handful of Cat-5e and 6-pin keystone jacks with faceplates at the station end.
I use Leviton, but any other jacks would work. Did I mention that you could probably hire a professional and pay a half day's wages to have this done for you?
At the station end, strip about 5 inches of the jacket and wire the orange and green pairs onto the jack, close up to the jacket, leaving the blue and brown pairs long. Then wire the blue pair on the 6 pin jack in the blue slots (43) and the brown pair in the orange pair slots (25). Keep enough slack in those pairs to fit the keystone in the faceplate and you now have two jacks at each location.
At the head end, I'd take every cable and treat it as an even odd pair. Strip the same 5 inches of jacket and wire the orange and green pairs close to the odd jack. Then take the blue pair and wire it to the blue pair of the even jack, and the brown pair to the 3rd pair of the even jack (green set-if you used 568B markings on the patch panel.) With that, every even jack becomes an RJ-14 jack and every odd pair becomes at least a 10 and maybe 100 base T jack.
LkEErie