It is usually much easier to install filters at each telephone jack that is in use.
From the en.wikipedia.org
For ordering pay-per-view, there's also a telephone jack and Ethernet port.
From the businessweek.com
It was anywhere, really, that the 23-year-old writer could sprawl with her laptop computer, reach a telephone jack and plug into the Internet.
From the time.com
Instead of a home or business phone being plugged into a normal telephone jack, that same cord simply gets plugged into a device connected to a high-speed cable modem or DSL line.
From the heraldtribune.com
So rather than ask you to monitor Internet use in person, Tel-Lock provides a special telephone jack that locks with a key to block any incoming or outgoing calls.
From the time.com
Plugged into a telephone jack, the device automatically dials a series of preprogrammed numbers-an ambulance service, say, then a doctor's office-and sounds the appropriate taped message for each.
From the time.com
Plug the cord from your telephone system's wall jack into one side, your landline phone into the other, and run the 3.5mm audio cable out to a voice recorder.
From the techcrunch.com
Jack did not return a telephone call to his office Monday, and was on vacation last week when the story of Michael's departure first broke.
From the washingtonpost.com
An analog telephone adapter is a device that connects to the network and implements the electronics and firmware to operate a conventional analog telephone attached through a modular phone jack.