How do I change the number of rings before it goes to voice mail

The manual is available from:
http://www.manualslib.com/download/678020/Vtech-Cs6859.html
--
( be sure to ignore the advertising large button
"start download" and use the smaller button "download"
across the top banner "downloads" "table of contents" etc. )
then enter the security-codes & click "Get Manual"
then click 'Download pdf'' etc. )

The directions to set the number of rings for the
Answering System are on page 51.

To summarize Setting the Number of Rings:

1. press [MENU]
2. scroll up/down to "Ans System" then press [select]
3. scroll up/down to "Ans System Setup" then press [select]
4. scroll up/down to "# of Rings" then press [select]
5. scroll through the choices, at desired one press [select]
6. press [off ] to conclude & exit
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Good luck!