[Home](./index.md) > [sip.js](./sip.js.md) > [UserAgentDelegate](./sip.js.useragentdelegate.md) > [onMessage](./sip.js.useragentdelegate.onmessage.md) ## UserAgentDelegate.onMessage() method Called upon receipt of a message. Signature: ```typescript onMessage?(message: Message): void; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | message | Message | The message. | Returns: `void` ## Remarks Handler for incoming out of dialog MESSAGE requests.