[Home](./index.md) > [sip.js](./sip.js.md) > [UserAgentOptions](./sip.js.useragentoptions.md) > [transportConstructor](./sip.js.useragentoptions.transportconstructor.md) ## UserAgentOptions.transportConstructor property A constructor function for the user agent's `Transport`. Signature: ```typescript transportConstructor?: new (logger: any, options: any) => Transport; ``` ## Remarks For more information about creating your own transport see `Transport`.