[Home](./index.md) > [sip.js](./sip.js.md) > [IncomingRequestDelegate](./sip.js.incomingrequestdelegate.md) > [onTransportError](./sip.js.incomingrequestdelegate.ontransporterror.md) ## IncomingRequestDelegate.onTransportError() method A transport error occurred attempted to send a response. Signature: ```typescript onTransportError?(error: TransportError): void; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | error | TransportError | Transport error. | Returns: `void`