Sony PCV-RZ44G - Vaio Desktop Computer User Manual page 58

There is no dial tone
If Media C enter cannot detect a dial tone, then do the following:

Make sure that your phone cable is connected to the modem in your computer and the wall telephone jack.

Make sure that the phone line is not already in use.
 Make sure that the phone service is working: Plug in the telephone to the same phone jack used for your computer, and then listen
for a dial tone.
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Page 58