---
title: Error Domains
framework: Core Telephony
role: collectionGroup
role_heading: API Collection
path: coretelephony/error-domain-codes
---

# Error Domains

Error domains used by Core Telephony errors.

## Topics

### Error Domains

- [kCTErrorDomainMach](coretelephony/kcterrordomainmach.md)
- [kCTErrorDomainNoError](coretelephony/kcterrordomainnoerror.md)
- [kCTErrorDomainPOSIX](coretelephony/kcterrordomainposix.md)