[Home](./index.md) > [sip.js](./sip.js.md) > [SimpleUserDelegate](./sip.js.simpleuserdelegate.md) > [onCallHold](./sip.js.simpleuserdelegate.oncallhold.md) ## SimpleUserDelegate.onCallHold() method Called when a call is put on hold or taken off hold. Signature: ```typescript onCallHold?(held: boolean): void; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | held | boolean | | Returns: `void` ## Remarks Callback for handling re-INVITE responses.