[Home](./index.md) > [sip.js](./sip.js.md) > [UserAgentOptions](./sip.js.useragentoptions.md) > [transportOptions](./sip.js.useragentoptions.transportoptions.md) ## UserAgentOptions.transportOptions property An options bucket object passed to `transportConstructor` when instantiated. Signature: ```typescript transportOptions?: any; ``` ## Remarks See WebSocket Transport Configuration Parameters for the full list of options for the default transport.