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Not sure if all C-Phones are the same, and this is a little late, but in case you have other questions, there is an instruction manual that you can check out on-line.
C-Phone Instruction Manual
Go to: http://isupport.nuance.com
click links below:
Click on "Guest Users" toward bottom of page.
Click on "Technical Library" on the next page.
On the next page enter "Connexions" in the SEARCH box.
This will return a page with several links to manuals related to the Connexions line of products.
Click on "Connexions Telephone Operating Instructions, L-940".
This is a PDF file.
There's also a "Quick Reference Guide" you can download.
Hope this helps for future reference.
Good Luck