[Home](./index.md) > [sip.js](./sip.js.md) > [UserAgent](./sip.js.useragent.md) > [(constructor)](./sip.js.useragent._constructor_.md) ## UserAgent.(constructor) Constructs a new instance of the `UserAgent` class. Signature: ```typescript constructor(options?: Partial); ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | options | Partial<UserAgentOptions> | Options bucket. See [UserAgentOptions](./sip.js.useragentoptions.md) for details. |