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# CallError

> Structured error emitted on call.errors$.

Structured error emitted on `call.errors$`.

Provides actionable metadata so consumers can react without
resorting to `instanceof` checks on raw `Error` objects.

## **Properties**

**`callId`** `string` — required

ID of the call that produced this error.

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**`error`** `Error` — required

The underlying error.

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**`fatal`** `boolean` — required

Whether the error terminates the call. When `true`, the call will automatically transition to `'failed'` and be destroyed — no further action is needed from the consumer.

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**`leg`** `'main' | 'screenshare' | 'additional-device'`

Which peer connection failed, e.g. `'screenshare'`. Auxiliary legs are never fatal, so a consumer can surface "screen share failed, call continues". Absent for call- and session-level errors.

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**`legId`** `string`

ID of the failing leg. `callId` is always the call's own ID, never the leg's — use this one to identify the leg.

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**`kind`** `CallErrorKind` — required

Semantic category of the error. See [`CallErrorKind`](/docs/browser-sdk/v4/reference/type-aliases/call-error-kind).

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> Structured error emitted on call.errors$.