The process of following a suspected illegal call hop by hop, from the terminating provider back through each upstream provider, until the originator is identified.
Illegal robocalls often pass through several providers before reaching the consumer. A traceback starts with a specific call, identified by its calling and called numbers and timestamp, and asks each provider in the path which upstream provider handed it the call. The process repeats until it reaches the provider that originated the call or a provider that will not cooperate.
In the United States, tracebacks are most commonly run by the industry consortium the FCC has registered under the TRACED Act. FCC rules require providers to respond fully to traceback requests from the Commission, law enforcement, and the registered consortium within 24 hours. Responses typically identify the upstream provider, confirm whether the call was found in the responding provider's records, and sometimes describe the customer involved.
Traceback results feed enforcement. The FCC and state attorneys general use them to identify providers that repeatedly carry illegal traffic, and they can lead to cease-and-desist letters, orders requiring downstream providers to block a provider's traffic, or removal from the Robocall Mitigation Database. A provider that consistently appears at the start of the chain, or that stops responding, quickly becomes a focus for investigators.
Why it matters to carriers
How quickly and completely you answer traceback requests is visible to regulators, and repeated appearances as an originating or point-of-entry provider attract scrutiny. Fast access to CDRs, signing records, and customer identity data, and a clear internal owner for traceback responses, are essential for staying compliant and protecting your interconnects.