This is the best I can do to answer part of your problem. I solved my problem by taking this advice from Uniden for their dual phone set:
Selecting Ringer Tone (handset only) Question: How do I set/change my ringer tone on the handset? There are two different way to change you ringer tone depending on which model you have. If you do not have an option in your menu on you handset for handset setup, then you will simply hit the volume ^ or v arrows on the handset rapidly scrolling through the 2 ringer tones and volume combinations.
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There are different ways to adjust the ringer and speaker volume on your handset. Please see your owners manual for model specific instructions. On most single handset units: Ringer volume: Press the volume up or down arrow rapidly to change the ringer volume. Speaker volume: When talking on the handset press the volume up and down arrow to increase or decrease the volume. On other models: Ringer volume In standby mode, press the volume up key or volume down key on the handset or base to select one of three ringer volume (Off, Low, or High).
Earpiece and Speaker Volume You can select from among of six volume levels on the handset, and ten levels on the base. Pressing the volume up key or volume down key on the handset or base during a call will change the earpiece or speaker volume. This setting will remain in effect after the telephone call has ended. If you press the volume up key when the earpiece is at the maximum volume level, an error tone sounds. The error tone also sounds if you press the volume down key at the lowest volume. Sergio
It may have lost the link to the base unit. Make a note of all the personal details, stored number, etc., then reset the handset. Do this by pressing the spanner button until the display changes, then press and hold the 'R' (delete) button until the handset resets. You'll have to set it up again, but at least it will link. Spanner then 1 for ringtone, CID for volume. Spanner then 2 for keypad bleep, 1=off, 2=on. both cases press spanner to confirm changes.