I have a standard trouble-shooting routine for cordless phones. 1) Remove the battery from the handset (from all handsets for a multi-handset version). Then unplug the power cord from the base and wall outlet and also remove the telephone cord. Wait a few minutes and then reconnect the power and phone line cords. Reconnect the battery (ies) for the handsets. Make sure this connection is tight. Then make sure that the battery is fully charged (15 hours before first use) and register the handsets if needed. This is done by putting each handset onto the base in order for the D2997. Wait about 30 seconds for each one until you see the Handset Registered message. Make sure that you are within range of the base.
Next try a different telephone (RJ-11) phone cord between the base and the wall jack. Also check if the power adapter for the base is warm. For the next set of tests, I like to use an old corded telephone. Using a different phone, check if you get dial tone at the jack. If there is a dial tone, then the problem is with the Uniden phone. If the above trouble-shooting didn't help, then contact Uniden. These phones aren't meant to be user serviced.
If you do not have a normal dial tone, try another jack on the same telephone line. If there is dial tone at another jack, then you have a problem with the first jack. Otherwise find where your telephone service comes in. If you have a fairly new service, you'll find an RJ-11 jack. Plug your test phone into the jack and test for dial tone. If you have no dial tone or can't test your line, call your phone company. They will fix any outside problem for free. If it is an inside wiring problem, look at the visible wiring and determine if the wires are damaged. Open the jack (if only one is bad) and check for loose wires. There are two types of jacks. One secures the terminal wires with screws and the other uses a punch-down jack. For the screw type, strip additional insulation from the conductors, if needed, and then reconnect them. For the punch-down type, you will need the punch-down tool. It is available at many hardware stores in the wiring section. Use this diagram to check your jack wiring: http://www.lanshack.com/wire_phone_jack.aspx
. If you can't see an obvious problem with the wiring, you may want a professional to deal with the wiring in the wall. Your telephone company will do this for a fee.
Uniden has the manuals for their DECT phones on their site: http://www.uniden.com/bin/venda?ex=co_disp-view&bsref=uniden&scat=dectphones_mnl
. The manual for the D2997 is available here: http://www.uniden.com/content/ebiz/uniden/resources/ownersmanuals/D2997om.pdf
I hope this helps.