RCA Lands Phones - Page 7 - Recent Questions, Troubleshooting & Support

http://telecom.hellodirect.com/eBiz/pdf/phones/RCA_25255.pdf?utm_source=SEO&utm_medium=Google&utm_content=Hello%20Direct%20%3E%20Multi-Line%20Phones&utm_term=&utm_campaign=5018NETC

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You may be able to tap the messages using the handset instead of the base unit. That way you can listen to the messages discretely.

You apparently have unheard messages on the voicemail system provided by your telephone company. This system records messages when someone calls while you're already on the phone. Please contact your telephone company for instructions on accessing their voicemail system.

Check online for maker. Look under customer service.

First thoughts are is the device near to a wall socket power supply? Non "Switch mode" power supplies use transformers and these give off a radiated 50/60Hz hum which can be picked up by devices with amplifiers such as answering machines and phones etc. Try moving the answering machine to a new location where there are no power supplies nearby and see if that makes a difference? If it does you have a couple of choices, leave the machine where it is or move the power supply to another wall socket further from the answering machine. Kevin

from the below link http://www.manualowl.com/p/RCA/25205RE1/Manual/12318