[Home](./index.md) > [sip.js](./sip.js.md) > [InviteClientTransaction](./sip.js.inviteclienttransaction.md) > [onTransportError](./sip.js.inviteclienttransaction.ontransporterror.md) ## InviteClientTransaction.onTransportError() method The client transaction SHOULD inform the TU that a transport failure has occurred, and the client transaction SHOULD transition directly to the "Terminated" state. The TU will handle the failover mechanisms described in \[4\]. https://tools.ietf.org/html/rfc3261\#section-17.1.4 Signature: ```typescript protected onTransportError(error: TransportError): void; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | error | TransportError | The error. | Returns: `void`