AT&T TRIMLINE TR1909 - Manual (Page 34)

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Appendix
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If you subscribe to high-speed Internet service (DSL - digital
subscriber line) through your telephone line, you must install a
DSL filter between the telephone line cord and the telephone
wall jack. The filter prevents noise and caller ID problems
caused by DSL interference. Please contact your DSL service
provider for more information about DSL filters.
I subscribe to a nontraditional telephone service that uses my
computer to establish connections, and my telephone doesn’t
work.
Make sure your computer is powered on.
Make sure your Internet connection is working properly.
Make sure that the software is installed and running for your
nontraditional telephone service.
Make sure to plug your USB telephone adapter into a dedicated
USB port on your computer. Do not plug it into a multiple port
USB hub (USB splitter) that is not powered.
In a few rare cases, the USB port on your computer may not
have enough power. In these cases, try using a USB hub with its
own external power supply.
If you are using a firewall, it may prevent access to your
nontraditional telephone service. Contact your service provider
for more information.
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Troubleshooting