# TransUnion TruContact Trusted Call Solutions (STI-AS / STI-VS)

**Canonical:** https://apis.io/apis/transunion/trucontact-trusted-call-solutions/  
**Provider:** TransUnion — https://apis.io/providers/transunion/  
**Base URL:** https://{hostname}:{port}/{optionalRoutingPath}  
**Documentation:** https://neustar.github.io/tcs-apis/

TransUnion TruContact Trusted Call Solutions (STI-AS / STI-VS) is one of 3 APIs that [TransUnion](https://apis.io/providers/transunion/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Call Authentication, STIR/SHAKEN, Telecommunications, Fraud Prevention, and Robocall Mitigation. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and an API reference.

The STIR/SHAKEN call Authentication Service and Verification Service behind TransUnion TruContact Branded Communications. Nine POST operations sign SIP Identity headers (PASSporTs) and verify them, with a Call Validation Treatment variant that returns calling name and robocall analytics alongside the verdict. The only TransUnion API with a public machine-readable contract: the OpenAPI 3.1.0 is published on GitHub under an MIT licence with an open proposal process.

## Machine-readable artifacts (9)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/transunion/refs/heads/main/openapi/transunion-trucontact-tcs-shaken-openapi.yml
- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/transunion/refs/heads/main/openapi/transunion-trucontact-3gpp-call-authentication-openapi.yml
- **Overlay** — https://raw.githubusercontent.com/api-evangelist/transunion/refs/heads/main/overlays/transunion-trucontact-tcs-shaken-overlay.yaml
- **Overlay** — https://raw.githubusercontent.com/api-evangelist/transunion/refs/heads/main/overlays/transunion-trucontact-3gpp-call-authentication-overlay.yaml
- **Documentation** — https://neustar.github.io/tcs-apis/
- **APIReference** — https://neustar.github.io/tcs-apis/
- **SourceCode** — https://github.com/neustar/tcs-apis
- **Solutions** — https://www.transunion.com/solution/trucontact/branded-communications/trusted-call-solutions
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/transunion/refs/heads/main/apis.yml

## Other TransUnion APIs (2)

- [TransUnion Global Developer Portal](https://apis.io/apis/transunion/global-developer-portal/)
- [TransUnion TruValidate Device Risk](https://apis.io/apis/transunion/truvalidate-device-risk/)

## Tags

Call Authentication, STIR/SHAKEN, Telecommunications, Fraud Prevention, Robocall Mitigation

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/transunion/trucontact-trusted-call-solutions/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/transunion/.