> ## Documentation Index
> Fetch the complete documentation index at: https://baileys.wiki/llms.txt
> Use this file to discover all available pages before exploring further.

# IBCallMessage

> Protobuf interface IBCallMessage generated from WAProto.

Defined in: [WAProto/index.d.ts:5583](https://github.com/WhiskeySockets/Baileys/blob/master/WAProto/index.d.ts#L5583)

## Properties

### caption?

> `optional` **caption**: `null` | `string`

Defined in: [WAProto/index.d.ts:5587](https://github.com/WhiskeySockets/Baileys/blob/master/WAProto/index.d.ts#L5587)

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### masterKey?

> `optional` **masterKey**: `null` | `Uint8Array`\<`ArrayBufferLike`>

Defined in: [WAProto/index.d.ts:5586](https://github.com/WhiskeySockets/Baileys/blob/master/WAProto/index.d.ts#L5586)

***

### mediaType?

> `optional` **mediaType**: `null` | [`MediaType`](/proto-reference/Message/BCallMessage/enumerations/MediaType)

Defined in: [WAProto/index.d.ts:5585](https://github.com/WhiskeySockets/Baileys/blob/master/WAProto/index.d.ts#L5585)

***

### sessionId?

> `optional` **sessionId**: `null` | `string`

Defined in: [WAProto/index.d.ts:5584](https://github.com/WhiskeySockets/Baileys/blob/master/WAProto/index.d.ts#L5584)