TDS implements STIR/SHAKEN Robocall Blocking

Millions of illegal “spam” calls have been screened and blocked in June alone

TDS Telecommunications LLC (TDS®) has implemented STIR/SHAKEN Robocall Blocking on all IP-based phone service networks in compliance with the Federal Communications Commission (FCC) mandates. Robocalling is the use of autodialing to make automated calls to deliver a prerecorded message. By implementing specialized software on all capable equipment, the TDS network identifies potential “spam” callers and stops calls from being delivered to customer lines at no additional cost.

“We’re pleased to be part of this important initiative,” says Andrew Petersen, senior vice president of Corporate Affairs at TDS. “TDS is committed to the highest standards of service for our customers. Taking action to protect our customers from illegal robocalls is part of that commitment.”

In 2019 the FCC asked the telecommunications industry to implement controls to reduce unwanted robocalls for customers by utilizing STIR/SHAKEN. STIR/SHAKEN are acronyms for the Secure Telephone Identity Revisited (STIR) and Signature-based Handling of Asserted Information Using toKENs (SHAKEN) standards.

TDS first rolled out STIR/SHAKEN Robocall blocking in California in January, then added the technology to all capable equipment across its networks in the 31 states the company serves in the preceding months at no additional charge to customers. Although TDS is not aware of illegal robocalls originating on its network, call mitigation programs such as STIR/SHAKEN focus on identifying and stopping illegal robocalls where they start.

By all measures, TDS’ program has been successful. In June, the company screened more than 30 million calls and blocked 4.9 million suspected illegal robocalls.

“Unwanted calls, including those that falsify Caller ID information, can result in fraud as well as pose a danger to public safety,” says Petersen “On behalf of TDS, I’d like to thank the members of Congress and the FCC for their leadership on this important consumer protection program.”

Robocall blocking does not stop calls from legitimate fundraising organizations, political parties, or non-profit agencies that adhere to FCC guidelines. These same organizations, including debt collectors, may also place calls to numbers that are registered on the national Do Not Call Registry. Visit or call 1-888-382-1222 for more information.

To report someone who is making illegal calls or transmitting inaccurate Caller ID information, visit A customer may opt out of FREE Robocall Blocking by contacting TDS: 1-877-422-5282.

For more information on TDS Robocall Blocking services, visit Please note there are technical limitations that inhibit program implementation in certain communities. 

Media Contact: Missy Kellor, Associate Manager-Communications | TDS | 608-664-4836 |

TDS Telecommunications LLC (TDS Telecom/TDS®) delivers high-speed internet, TV entertainment, and phone services to a mix of small to mid-sized urban, suburban and rural communities throughout the U.S. With 1.2 million connections, TDS is a rapidly growing technology company. Powered by fiber-optics and new industry-leading technologies, TDS delivers up to 8 Gigabit internet speeds and offers internet-protocol based TV entertainment solutions along with traditional phone services. TDS also offers businesses VoIP advanced communications solutions, dedicated internet service, data networking, and hosted-managed services. Visit

TDS Telecom, headquartered in Madison, Wis., employs 3,400 people and is a subsidiary of Telephone and Data Systems, Inc. [NYSE: TDS]. Founded in 1969, Telephone and Data Systems provides wireless, broadband, video and voice; and hosted and managed services to approximately 6 million connections nationwide through its businesses: UScellular, TDS Telecom, and OneNeck IT Solutions. Visit

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