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# CXErrorCodeNotificationServiceExtensionError

Errors that can occur when reporting new, incoming VoIP calls.

```
struct CXErrorCodeNotificationServiceExtensionError
```

## Overview

The system can return these errors to the [`reportNewIncomingVoIPPushPayload(_:completion:)`](/documentation/CallKit/CXProvider/reportNewIncomingVoIPPushPayload(_:completion:)) method’s completion handler.

## Topics

### Accessing Error Data

### Understanding Error Codes

[`static var invalidClientProcess: CXErrorCodeNotificationServiceExtensionError.Code`](/documentation/CallKit/CXErrorCodeNotificationServiceExtensionError-swift.struct/invalidClientProcess)

An error indicating that an invalid client process reported the incoming call.

[`static var missingNotificationFilteringEntitlement: CXErrorCodeNotificationServiceExtensionError.Code`](/documentation/CallKit/CXErrorCodeNotificationServiceExtensionError-swift.struct/missingNotificationFilteringEntitlement)

An error indicating that the notification service extension is missing the required filtering entitlement.

[`static var unknown: CXErrorCodeNotificationServiceExtensionError.Code`](/documentation/CallKit/CXErrorCodeNotificationServiceExtensionError-swift.struct/unknown)

An error that occurs when there is an unknown problem.

[`enum Code`](/documentation/CallKit/CXErrorCodeNotificationServiceExtensionError-swift.struct/Code)

Constants for errors returned when reporting new, incoming VoIP calls.

### Comparing Errors

### Type Properties

[`static var errorDomain: String`](/documentation/CallKit/CXErrorCodeNotificationServiceExtensionError-swift.struct/errorDomain)

## Relationships

### Conforms To

[`Error`](/documentation/Swift/Error)

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

[`Equatable`](/documentation/Swift/Equatable)

[`Hashable`](/documentation/Swift/Hashable)

[`Sendable`](/documentation/Swift/Sendable)

[`CustomNSError`](/documentation/Foundation/CustomNSError)

---

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