Dell 3115cn Service Manual page 54

3) No response signal sent
Cause: Incorrect connection. Incorrect reception mode.
Corrective Action: Correct the connection. Reset receive mode to correct settings.
If a call is made to the fax from a telephone, and the fax does not emit its ringing
sound, a telephone line fault is highly probable.
To check for a ring tone, an external telephone must be connected.
Version 1 2006.11.21
Chapter 1 Troubleshooting