RCA visys do not disturb - GE 21028GE3 Cordless Phone

The 25424RE1 isn't a voicemail system. Please consult the documentation for whatever voicemail system you're using.

If you require further assistance, please repost your question specifying the voicemail system you're using.

Go into the phone menu, it is there.

Since you declined to specify the model of your RCA ViSYS 2-line phone, I can only suggest that you select it from this page to download a copy of the manual.

RCA ViSYS 2-Line Phone (25255RE2)

Here's the manual for your 2-line phone:
http://www.rca4business.com/products/pc/pdf/instruction-book/25255RE2.pdf

refer to pages 40-43 of your manual for "Answering System Operation."

To enable your Answering System, press and hold the "ans sys" button for 2 seconds.
The "ans sys" button indicator will flash.

To disable your Answering System, press and hold the same button for 2 seconds.
The "ans sys" button indicator will go off.

RCA makes several different 2-line phone systems. Select the model you have from
http://www.rca4business.com/products/pc/viewCategories.asp?idCategory=28

Follow this link for answers and troubleshooting tips. http://www.rca4business.com/products/pc/viewPrd.asp?idcategory=12&idproduct=14

Have you contacted your phone company to see if they are causing the cross talk?

There is a battery box that holds 4 AAA batteries. It's down under. Not easy tospot but it's there. However, I added fresh batteries and it stil says replace battery. I'd like ot know how to turn off the message.

http://www.rca4business.com/products/pc/pdf/instruction-book/25450RE3.pdf

There you go.

need to set up message system