---
title: CallKit Constants
framework: callkit
role: collectionGroup
role_heading: API Collection
path: callkit/callkit-constants
---

# CallKit Constants

## Topics

### Constants

- [CXErrorDomainNotificationServiceExtension](callkit/cxerrordomainnotificationserviceextension.md)

## See Also

### Reference

- [CallKit Enumerations](callkit/callkit-enumerations.md)