Uniden DECT4066A-4R English Owners Manual - Page 40

Weak or Hard To Hear Audio If a 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.  Try moving around while you're on a call or moving closer to the base to see if the sound gets louder.  Make sure the handset's battery is fully charged.  Try adjusting the earpiece volume. Noise or Static On The Line Interference is the most common cause of noise or static on a cordless phone. Here are some common sources of interference:  electrical appliances, especially microwave ovens  computer equipment, especially wireless LAN equipment and DSL modems  radio-based wireless devices, such as room monitors, wireless controllers, or wireless headphones or speakers  large florescent light fixtures (especially if they give off a buzzing noise) Do you use a T-coil hearing aid? If you have a hearing aid equipped with a telecoil (T-coil) feature, the interaction between the hearing aid and digital cordless phones can cause noise in the handset. If you have a T-coil hearing aid and you have problems with noise on the line, try turning  other services that on T-coil mode. Open the menu; select use your phone line, Handset Setup, then select T-coil. like alarm systems, Using T-coil mode can shorten the handset' intercom systems, or s talk time; make sure to watch the battery broadband Internet status and keep the battery charged. service 38