[Home](./index.md) > [sip.js](./sip.js.md) > [InviteUserAgentClient](./sip.js.inviteuseragentclient.md) > [onTransportError](./sip.js.inviteuseragentclient.ontransporterror.md) ## InviteUserAgentClient.onTransportError() method Special case for transport error while sending ACK. Signature: ```typescript protected onTransportError(error: TransportError): void; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | error | TransportError | Transport error | Returns: `void`