I have a bt4500 cordless handset incoming voice volume very weak after turning volume up to maximum

Hi Kathleen, The link below is a user manual for a BT4500 CORDLESS PHONE.... The answer you're looking for is on page 28 When you enter the block calls list you can also edit or delete numbers you've stored previously by selecting and then pressing to display either and pressing Delete number You must subscribe to a Caller Display service from your network provider for the block nuisance calls feature to work. Charges may apply.
http://www.manualslib.com/manual/713677/Bt-Bt4500.html?page=1

I am checking possible solutions for you, meanwhile can you please test in speakerphone mode. So we can conclude whether its Function or Hardware related issue.
Thank you in advance

hi there more often than not phones like your Bt4500 have a battery that's installed inside the handset, now after long charge times and the handset being plugged in the base the battery becomes lifeless and faulty and dies, once a power cut happens as the handset has no longer got power the battery can not recover ! my best advice would be to open the back of the handset and locate the battery and replace with same from mapplins or ebay and give new battery a good charge this should get your phone working again

my cordless phone automatically goes to voicemail after just one or two rings. how to rectify

Here some solutions for your problem + a link to the user manual.

**Selecting the Ring Tone and Volume
Your phone has five different ringer tone/volume combinations you can choose from.
To select the ringer:
1) With the phone in standby, press [vol/ / ] or [vol/ / ].
2) The phone will sound the different ring tones at different volumes. To turn the ringer
off, select RINGER OFF.
3) When the phone sounds the ring tone and volume you wish to use, press [end].


**Temporarily Mute Ringer
If the handset is off the base while an incoming call is ringing, simply press [end] to mute
the incoming ring. The ringer will sound with the next incoming call.
Note: You can only mute the handset ringer if the handset is off the base when the phone starts
ringing.
Adjusting the Earpiece.

**Here is also a link to the phone manual http://www.uniden.com/pdf/EXI4561om.pdf

Many times there is a volume switch on the actual handset itself. Most commonly on the left side of vtech devices. there are three different volume levels. By pressing up on the button you should be able to turn the volume up until it has an audible tone confirming volume change. Handset should ring with incoming call when audible tone is heard by pressing up on volume button.

All speakers have a magnet in them, over time magnets lose the ability to create magnetic waves.

Weak or Hard to Hear Audio (From the Uniden Manual)
If the caller’s voice sounds weak or soft, the signal might be blocked by large metal objects or walls; you might also
be too far from the base, or the handset’s battery may be weak.

1. Try adjusting the volume of the earpiece (see page 36) or the audio tone
2. Try moving around while you’re on a call or moving closer to the base to see if the sound gets louder.
3. Make sure the handset’s battery is fully charged.

Adjusting the Ringer Volume (From the Uniden manual)

You can choose from four ringer volume settings (off, low, medium, and high) separately on each handset or the base.

1. With the phone in standby, press ArrowUp or Arrow Down on the handset or VOLUME + or VOLUME - on the base. The handset or base sounds the ringer at that level.
2. Use Arrow Up on the handset or VOLUME + on the base to make the ringer volume louder.
   
3. Use Arrow Down on the handset or VOLUME - on the base to make it softer or turn it completely off.
4. When you hear the ringer volume level you want to use, stop pressing keys.
   
5. The handset or base will use the new ringer volume starting with the next incoming call.
6. If you set the ringer volume to Off, the handset or base won’t ring.
   
7. Other handsets or base will ring according to their individual settings.

might want to check the handset volume .....