"jim, Check the volume control on phone, if slider volume control, slide the control up and down quickly several time to get switch contacts to make better connection, make sure volume control is in the high range. To rule out a bad line, try a different phone in same phone jack, if the problem is there with different phone the line is faulty. If the phone is older or has been dropped a few time chances are something inside the phone has been damaged,corroded,dirty, you could dismantle phone and look for broken solder connections, wires off, etc. and try and make a repair or just replace the equipment(phone) if line/jack is found to be OK.
Good luck.
I hope this helped you out, if so let me know by pressing the helpful button."
Given the model info you provided (thanks for that) there are two handsets associated with the base station, is this correct?
Just trying to narrow it down with all the following questions.
Does the problem occur when using either handset?
If the problem only occurs with the one handset and not the other it may be a battery problem, especially if the “problem” handset is used more often. Try swapping the batteries between the two handsets and check. You’ll probably have to re-register the handsets after removing / replacing the battery but not sure on this. How old are the phones (or the batteries if not originals)?
When the base station is transmitting to the handset, it gets its' power from the mains power supply. The handset relies on battery power and it takes more power to transmit a signal to the base station than to receive from the base station.
If it occurs on both handsets, what happens if you move away from the base station approx. the same distance in the other direction (if possible) to the direction in which you are experiencing the problem and use the handset on a call, does it work OK or not?
If it works OK there may be something creating interference to the signal when used in the other direction from the base station.
Looking at the user manual on p.77 it appears that you can check the signal strength of a “device”. Perhaps the handset is also considered a “device”, but I don’t if it is or not for this setting, but maybe worth a look as it would help if it is.
If it does appear in the “Set Device” settings you may be able to check the signal strength of the handsets from various locations and compare the two handset’s signal strength."
