Connecting the Internal Modem to the Telephone Line
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If your telephone has two modular jacks, connect it as illustrated below.

Notes on the Telephone Line

The internal fax modem can be connected to the subscriber telephone line.
Do not connect it to the PBX (Private Branch Exchange). Connecting to the
PBX may cause a failure or fire.
Some PBXs may use the same electric requirements as the subscriber
telephone line of the local telephone company. Ask the manufacturer of your
PBX or your PBX maintenance agent for compatibility.
Connecting Telephone Cord to Line Jack
Telephone with Two Modular Jacks
Note: When you complete the connections, you must use your communication
software to adjust the settings for your telephone, fax, and communication methods.
For details on adjusting settings, refer to your communications software manual.