Just purchased a GE phone wire junction box TL26545 add up to 4 extension lines. I am not sure how to wire the incoming line. There are four connections for the incoming line. I was expecting only one connector for the incoming line. I just want to connect the Blue with White and the White with Blue lines and then add three lines to the junction box. any suggestions.

That will be because the static was at the callers line, not at your end. At this time of year it is water in junction boxes at the caller's residence. If it was on every call, it would be down to your connections.

Black to black (hot), Green to green (ground) and the only one left is of course white to blue. The (neutral) white wire can be many different flavors (blue, red, orange, brown, etc.).

If the outlet your plugging into (or controlled by the service panel breaker) is 15 Amps use a minimum of 14 gage wire (or 12 gage is even better), if its a 20 Amp outlet use 12 gage wires (or 10 gage). Don't use a 16 or 18 gage wire because it may get hot and start a fire because its undersize for the Amps.

extention is disabled with out going facility, furnish phone model

You purchased a GFCI outlet.
You posted under GFCI combo switch and receptacle.
If you have different device, then add a comment.

On back of device are markings that show Line and Load.
These markings are associated with screws on device.
Black Hot wire connects to Brass-colored Line screw.
White Neutral wire connects to silver screw located opposite Line screw.
If you don't know which wires are Hot and Neutral, the testing steps are shown at bottom.

Your other two wires evidently go to a light, fan, or motor that is operated by the switch.
This is where the two wires that stick out of GFCI device are used.
Your Black Load wire connects to one wire, and your White Load wire connects to other wire.

Finally there are 2 screws left on GFCI device.
These screws are used if the Hot and Neutral wires go forward to another switch or receptacle box. This would require another Black and White wire in the box, and all devices from the GFCI forward would be protected by the GFCI.
As you know, the way electric circuits work is a Black Hot and White Neutral leave the circuit breaker box and travel to a junction box. From the junction box, the Black Hot and White Neutral travel to the next box, and then the next box, and so on until the last box is reached. Each box contains a switch or plug or combo device or a light fixture. In your case, the Black Hot and White Neutral may not send power forward to another box, and may just be a switch box that has a single wire to the light fixture, and that is the end of the circuit.

How to test for Hot and Neutral wires:
Separate your 4 insulated wires.
Turn power ON.
Test each wire to bare ground wire.
Tester will light up on Hot wire.
Now Hot is Identified.
Test Hot wire to each other wire in box, except bare ground.
Tester lights up on Neutral wire.

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, fixya expert speaks to you via phone while you test the wires and wire the device.

The following is for the GE 15207 to be operated at 120 volts ONLY(which is what you have):

Make sure the DIP switch is set to 120 volts (all switches in the ON position).

BOTH white wires are connected to the left most terminal. The incoming black (HOT or LINE) wire from the breaker or source is connected to the second terminal from the left.

Also under the second terminal from the left, connect a jumper (using the same gauge wire) over to the "COM" terminal.

Then connect the outgoing black wire (LOAD) to the lamppost to the "NO" terminal.

The two bare grounding wires are twisted together with the supplied wirenut. This is _very_ important for safety.

If you are not getting a dial tone then something is holding the line off hook. Disconnect any other device you have on your lines and check to see if you get your dial tone back. If you still have no dial tone unplug each phone and check again. You may have to disconnect everything for a minute or two so the phone company will reset its equipment. Plug in your phones one at a time and check your dial tone every time you add something new.

If you add something and you loose your dial tone immediately you may have a crossed connection in the wall socket, any splitters or in the phone plug. Check to make sure all of the wires in those sockets are straight before you plug in your phone wire.

If you add your CC machine and everything is good but it fails after you run a transaction you will have to contact the supplier of your CC machine. It is not hanging up the line.

The way 4 line phones work is that you need 4 lines on every jack that is connected to your phone.
You see the light probably because one of the phones has line conected and you see line appearance.

You may need to assign an intercom ID for that unit by pushing one of the intercom buttons at the top.

I bet the problem is that you used to have two phone lines and now you only have one line. You cannot program an extension into one of these phones unless both Line1 and Line2 coming into the phone are working- it will act as if the extension you picked is in use, but the actual thing it is complaining about is that Line2 isn't working. The phones might have been working for years on a single phone line as long as they didn't lose power. But you don't have to throw the phones away just because you gave up your second phone line, you can still make them work. (I did it for a 12 phone system.) The way to to it: make a special cable that connects your single incoming phone line to both L1 and L2 on the phone, tricking the phone into thinking both L1 and L2 are working. Then program the extensions into the phones, and go back to using a normal cable so that only Line1 is hooked up. To make this cable: take a normal male to male cable and cut off one end. Then connect both the black and the green wires of the cable to the green post in a standard phone jack (the kind you would surface mount on the wall will work best), and connect both the yellow and red wires to the rec post inside the phone jack. Now plug your incoming phone wire into the phone jack, and plug the wire you connected into the jack into the back of your phone. The phone is probably already blinking red on the intercom, just push the extension number you want it to have, making sure there are no conflicting extensions already in use.
I would reconnect the phone using a normal line so that only Line 1 is "hot", don't leave it on this double-connected cable any longer than you need to in order to program the extension.
Good luck!

Each telephone must be connected to line 1 and line 2 for
proper operation. The remaining lines 3 and 4 may — or may not —
be connected to each station as you desire. First plug in the battery, then the phone lines (1 & 2 are mandatory), and third the power cord. If your intercome LED is blinking red and green, then press: STORE IN, followed by "INTERCOM" followed by a free intercom# (i.e., any of the memory buttons 1 through 16 not already assigned to another telephone set. Then wait for the phone to go through its initiation sequence during which it searches each of the four possible lines. After that concludes, you should get dial tone on your active lines. :-) Marco