Hi - We are sorry to hear that you are having an issue with the VTech IS8151-4. Please make sure that the mute feature is not turned on and the mouthpiece is unobstructed. If this does not help, like many electronic devices, a system reboot may resolve the issue. You can try rebooting your phone system by disconnecting the power from the telephone base then unplugging the batteries on the cordless handsets for a minute. Reconnect and test. If the issue still persists, please contact VTech Customer Support for further assistance at 1-800-595-9511. We are open from 9:00 AM to 3:00 PM, Mondays through Fridays. When calling, please have your model number handy: IS8151-4. Thank you! - VTech Support
3 years, 6 months ago
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VTech Baby Monitors Team