A "Line in Use" message generally means that the phone can't get a dial tone. If all of the handsets/phones for that line are on standby or on hook, you need to check the wiring and incoming connection. First, connect a new RJ-11 cord between the phone and the jack. Check if there is a dial tone with the new cord. At least once, I saw a handset cord used in place of the RJ-11 cable. This combination will give this type of issue. If you have a DSL line, check the filter and replace it if it is inside.
For the rest of the wiring trouble-shooting, I like to check the wiring with a basic corded phone. Check if the test phone gets a dial tone at the first jack. If it does, then your first phone has a problem. If there is no dial tone, try plugging in the test phone at another jack on that extension line. If there is a dial tone, that suggests a problem at the first jack or the wiring to that jack. If you do not have a dial tone or there is no second jack, find your service connection. Open the box and look at the connections. If there is an RJ-11 jack, plug in the test phone. If you have a dial tone here, you have a wiring problem. If there is no RJ-11 jack or no dial tone, contact your telephone company. They can test the phone line and determine if the problem is inside or outside.
If the jack could be faulty, remove the cover plate. Look for any loose wires. There are two types of jacks - keystone and screw terminals. To replace a wire in a keystone jack, you will need a punch-down tool available at most hardware stores in the electrical and wiring aisle. Do not strip the wire; just place it in the correct position and push the wire into place with the tool. For the other type of jack, strip a small section of wire and secure it under the screw. See
http://www.lanshack.com/wire_phone_jack.aspx to see the terminal connections.
In many places, the phone company technicians will fix an outside problem for free. This includes a DSL filter in the service box. (There are some phone companies that are trying to force system upgrades and will avoid fixing older wiring.) If the problem is inside but not at the jack, you may want a professional to search for the issue. Your phone company technicians will often do this for a fee.
I hope this helps.
Cindy Wells
(I've had dial tone issues several times. Some were caused by rodents chewing on the copper wires (underground service). Others were due to work crews digging up the wire. A final outage issue had to do with a lightning strike damaging the DSL filter. With a fiber optic connection, we've had two service issues. The first was just after the installation and involved only one jack. That cable had been dropped during the service upgrade. After locating the RJ-11 cable behind the siding and connecting it to the service box port, the problem was solved. The second required a service call - the fiber optic modem card began to fail and couldn't properly translate the signal. The card was replaced solving all of the problems.)
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