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Frequently Asked Questions

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Q: Does it work with a 2-line phone?

For a two-line phone (e.g. home and home office; or dual business lines) you will need two splitters: one male to dual female (MDF) splitter and one female to dual female (FDF) splitter, two one-foot male to male (M2M) telephone line cords, and two Call Silencer devices. (1) Connect the MDF splitter to the cable phone modem. (2) Run a telephone wire from each port in the splitter to the “modem” side of each of the two Call Silencer devices. (3) Run a telephone wire from the “phone” side of each of the Call Silencer devices to the FDF splitter. (4) Connect your home phone network line into the FDF splitter.

RJ11 male to dual female MDF splitter

RJ11 female to dual female FDF splitter

Two 1-foot male to male M2M line cords

Q: If I have multiple phones, are multiple devices required?

No.  Only one Call Silencer is needed.  Connect Call Silencer into the cable phone modem.  Then connect the phone network line into Call Silencer.  It will block the calls on all lines on the home phone network.

Q: Which cable phone services is it compatible with?

All major cable phone services in the USA and Canada are supported, including: Astound (wave), AT&T U-verse, Broadvoice, Charter Spectrum, Comcast Xfinity, Consolidated communications, Frontier Communications, Ooma, optimum, RCN, Sonic, SureWest, Time Warner Cable, Verizon Fios, VoIPms, VOIPo, Vonage, wave.

Q: What type of landline services does it work with?

It is designed for VOIP (Voice-over Internet Protocol) lines. These are the type of line used by cable service providers.  It is not designed for POTS (Plain Old Telephone System) lines from the old telcos.

Q: Does Call Silencer work with cell phones?

No. It is designed exclusively to work with landline phones.

Q: Will Call Silencer work in conjunction with an older generation hardware robocall blocking device such as CPR Call Blocker?

Yes.  Keep your hardware robocall blocking device connected where ever it is on your phone network.  Connect your phone network to Call Silencer. Connect Call Silencer to your cable modem.  

Q: Will Call Silencer work with a phone with multiple handsets?


Q: If a call is blocked, will the phone ring at all?

No. Blocked calls do not ring even once.

Q: Is there a REN (Ringer Equivalent Number) limit?

Call Silencer does not impact the REN from your cable modem. The standard is 5.0 REN. Moderm telephones with a bell that rings have a REN of 1.0. Cordless phones usually have a REN of 0.4. An old candlestick telephone with the big metal ringer box typically has a REN of 1.5 to 2.5.

Q: Will legitimate incoming calls ring through on multiple, separate, individually wired phones?

Yes. Connect your phone network into Call Silencer and connect Call Silencer directly to your cable modem.

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