Documentation Index
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How Telnyx assigns STIR/SHAKEN attestation levels (A, B, C) to outbound calls. Understand the criteria, signed identity headers, and downstream impact.
| Scenario | Attestation |
|---|---|
| Call from owned phone number | A |
| Call from non-owned or verified number | B |
| Origin | Destination | Certificate |
|---|---|---|
| US number | Any | US |
| Canadian number | Canadian number | Canadian |
| Canadian number | US number | US |
| Route | Certificate |
|---|---|
| US → US | US |
| Canada → Canada | Canadian |
| US ↔ Canada (cross-border) | US |
| Method | Origination Number | Attestation | Original Passport |
|---|---|---|---|
| SIP REFER | Original caller | B | Not preserved |
| Call Control API (transfer) | Specified in request | A or B* | Not preserved |
| Call Control API (dial/bridge) | Specified in request | A or B* | Not preserved |
TeXML <Dial> | Specified in request | A or B* | Not preserved |
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