WDSS5315 old phone functioned perfectly well until today when it no longer allows input of numbers and cannot be disconnected when a call comes in.

SOURCE: Handset Buttons Stopped Working - Full Battery

Here is a link to Uniden's site, and on the right side of the page, there is a link for a download manual pdf and helpline
http://www.uniden.com/products/productdetail.cfm?product=TRU8885-2

also worth checking if any buttons are stuck, or if the handset is set to pulse rather than tone mode, or if it has had a tumble or knock, possibly the keypad connector has come loose .

Hope this helps.

SOURCE: Uniden DCT648 register phone problem

On the Base Station select HS Registration then on the Handset hold # for 2 sec

SOURCE: No dial tone on handset

It may not be registed with the main unit. You may need to register the handset. With my uniden all i have to do is put it in the main base until it says what handset it is (it should be a number).

If you have any questions please dont hesitate to ask

SOURCE: Dial Tone but won't call out.

The problem was the main phone line not the phone itself

SOURCE: Disconnects incoming calls after one ring

The problem may be a short on your line. (Have the local Teleco check your line.) If you have other phones, you may want to check them for dial tone(DT) when this happens. If you have no DT, your cordless may be the problem...unplug, and let charge overnight. If problem continues, replace the battery in cordless, or discontinue use.