TELEPHONES LOOKING FOR BASE?

That type of spare is not normally available on phone sets. I guess you could contact Panasonic.

Cordless & Corded Replacement Parts' Panasonic US

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Handset Charger. PNLC1046ZW. Replacement Handset Charger for select Digital Cordless Answering Systems. Does not include AC Adapter or Handset.

Official Panasonic Cordless Phone & Corded Telephone ...

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Shop Panasonic cordless and corded telephone accessories from batteries, headsets, replacement parts and more.

Panasonic Telephone Parts and Accessories

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Panasonic Telephone from Encompass parts & accessories. ... and Accessories. Panasonic Replacement Parts ... Cordless Phone With Answering Machine, 7.

These can be the only things that are causing your problems:

Ringer mute
You can mute the ringer temporarily when the telephone is ringing.
Press OFF/CLEAR or MUTE to temporarily silence the ringer. The next call will ring normally.

Ringer volume
You can change the handset ringer volume to a comfortable level. The ringer can also be turned off so the telephone does not ring when there are incoming calls.
To adjust the ringer volume:
Press MENU/SELECT to display the menu when the handset is not in use.
Press or to select >RINGER VOLUME, then press MENU/SELECT.
Press or to adjust the volume. A sample of each volume level will be played as you adjust it.
Press MENU/SELECT to save your selection. You will hear a confirmation tone.


Make sure the ringer is on (page 8).
Make sure the telephone line cord and power adapter are plugged in properly (page 2).
The handset may be too far from the telephone base. Move it closer to the telephone base.
There may be too many extension phones on the telephone line to allow all of them to ring simultaneously. Try unplugging some of them.
If the other telephones in your home are having the same problem, the problem is in the wiring or local service. Contact the local telephone company (charges may apply).
Other electronic products can cause interference to your cordless telephone. Try installing your telephone as far away as possible from the following electronic devices: wireless routers, radios, radio towers, pager towers, cellular telephones, digital telephones, intercoms, room monitors, televisions, VCRs, personal computers, kitchen appliances, and other cordless telephones.
Test a working telephone at the telephone wall jack. If another telephone has the same problem, the problem is in the telephone wall jack. Contact your local telephone company (charges may apply).
The telephone line cord might be malfunctioning. Try installing a new telephone line cord.
Wait for the handset to synchronize with the telephone base. Allow up to one minute for this to take place.

In case of a problem or clarification or my solution was insufficient, don't hesitate to post me a reply.

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After verifying that the base unit is powered up, re-register the handset to the base which can be found on page 39 of the manual. Use tis link to get manual http://www2.panasonic.com/consumer-electronics/support/Phones-Fax/Telephones/Expandable-Systems/Operating-Instructions/model.KX-TG6051M.O#ts

good day,
hope this link below will solve your problem.

telephones

Answer: Telephone line noise is usually caused eitherby an attached telephone or by the telephone line acting as an antennaand picking up radio frequency interference. If you have checked all ofthe telephones and telephone line devices and the noise problem occurson all outlets and all telephones (or at least all telephones without abuilt-in filter), then we recommend one of the noise problem solverslisted below. These work by removing the unwanted frequencies. If youhave tried both a filter and a choke core without results, then theproblem may be a physical problem with the phone line wiring iteself.In this case, you would need to contact your telephone company to havethem check the wiring.

• RF Line-noise Filter (Cat. No. 43-150)
  Helps reduce noise, static and radio interference from 3-30 MHz.
  Easy to install. Plugs into modular phone line.
  
• Snap-together Toroid Choke Core (Cat. No. 273-104)
  Helps cut RFI.
  Use on phone, computer, AC, audio and coax cables.
  No need to cut cables - simply wind it through the core.

It doesn't solve the problem but will give you a hand to solve it.Hope it helps.

http://www.retrevo.com/s/Uniden-DCT758-Telephones-review-manual/id/471ag403/t/1-2/

Above is the manual for your phone ,read pages 13-21 and should help you out.

get a telephone repairman

Make sure the ringer is on .
• Make sure the telephone line cord and power adapter are plugged in properly .
• The cordless handset may be too far from the telephone base. Move it closer to the telephone
base.
• There may be too many extension telephones on the telephone line to allow all of them to ring
simultaneously. Try unplugging some of them.
• If the other telephones in your home are having the same problem, the problem is in the wiring
or local service. Contact the local telephone company (charges may apply).
• Other electronic products can cause interference to your cordless telephone. Try installing your
telephone as far away as possible from the following electronic devices: wireless routers, radios,
radio towers, pager towers, cellular telephones, digital telephones, intercoms, room monitors,
televisions, VCRs, personal computers, kitchen appliances, and other cordless telephones.
• Test a working telephone at the telephone jack. If another telephone has the same problem, the
problem is in the telephone jack. Contact your local telephone company (charges may apply).
• The telephone line cord might be malfunctioning. Try installing a new telephone line cord.
• Remove and re-insert the battery and place the cordless handset in the telephone base.
• Wait for the cordless handset to synchronize with the telephone base. Allow up to one minute
for this to take place.
for more info download this http://www.vtechphones.com/docMgt/public/art/52882/6041_manual.i3.pdf

Hi,

Try unplugging all telephone (including the base unit), then try to call the number again. If there is still a busy signal, then the problem is with your telephone line/connection and you need to call your phone provider. On the other hand if the number rings, then chances are that base unit is defective (or one of your other phones physically connected to the tel line.).

To verify that it is the base unit or one of the other wired telephones,  reconnect them one by one and determine which of them will cause the busy signal. Problems like this can be caused by a power surge, near lightning strike or a simple component failure.

If it is the base unit, it is very likely an electronic problem and therefore would require familiarity with components and circuitry diagnosis, soldering and use of a DVM. Perhaps your best bet would be to seek the services of a qualified phone technician.

Hope this be of some help/idea. Post back how things turned up or should you need additional information.

Good luck and kind regards.