# Open Verifiable Calling

## Docs

- [Overview](https://ovc.provenant.net/overview.md)
- [Guide for Issuers](https://ovc.provenant.net/iguide.md): Most companies in the GSMA foundry project won't have an issuer role, so they can ignore this doc. If you are a vetter or a seller of TNs, you will be issuing, but your work is quite simple:
- [Guide for Signers](https://ovc.provenant.net/signers.md)
- [Guide for Verifiers](https://ovc.provenant.net/verifiers.md)
- [Glossary](https://ovc.provenant.net/glossary.md)
- [Credential Types](https://ovc.provenant.net/cred-types.md)
- [Credential Structure](https://ovc.provenant.net/cred-structure.md)
- [Comparing to SHAKEN](https://ovc.provenant.net/comparing-to-shaken.md)
- [Comparing to RCD](https://ovc.provenant.net/comparing-to-rcd.md)
- [SIP Response Codes](https://ovc.provenant.net/sip-response-codes.md)
- [About Replay Attacks](https://ovc.provenant.net/about-replay-attacks.md)


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