English Owners Manual
Page 44
... Hear Audio If a caller's voice sounds weak or soft, the signal might also be too far from the base, or the handset's battery may be blocked by large metal objects or walls; Deleting messages (the memory may be too long. Making sure the date is the most common cause of interference...
... Hear Audio If a caller's voice sounds weak or soft, the signal might also be too far from the base, or the handset's battery may be blocked by large metal objects or walls; Deleting messages (the memory may be too long. Making sure the date is the most common cause of interference...