Lexmark X5470 Fax Manual page 52

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If you are using a PBX telephone service, make sure you are connecting to an analog connection on the PBX.
If none exists, consider installing an analog telephone line for the fax machine. For more information on faxing
when using a PBX telephone service, see "Setting up to fax while behind a PBX" on page 18.
C
HECK PHONE LINE
If the telephone line is being used by another device, wait until the other device is finished before sending the fax.
C
HECK CABLE CONNECTIONS
Make sure cable connections for the following hardware are secure, if applicable:
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Power supply
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Telephone
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Handset
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Answering machine
Troubleshooting
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