---
title: domain
framework: Core Telephony
role: symbol
role_heading: Instance Property
platforms: [iOS 4.0+, iPadOS 4.0+, Mac Catalyst 14.0+, macOS 10.10+]
path: coretelephony/cterror/domain
---

# domain

A numeric indication of the error domain.

## Declaration

```swift
var domain: Int32
```

## Discussion

Discussion See Error Domains for possible values of this property.

## See Also

### Getting Error Properties

- [error](coretelephony/cterror/error.md)