[Home](./index.md) > [sip.js](./sip.js.md) > [Dialog](./sip.js.dialog.md) > [initialDialogStateForUserAgentClient](./sip.js.dialog.initialdialogstateforuseragentclient.md) ## Dialog.initialDialogStateForUserAgentClient() method When a UAC receives a response that establishes a dialog, it constructs the state of the dialog. This state MUST be maintained for the duration of the dialog. https://tools.ietf.org/html/rfc3261\#section-12.1.2 Signature: ```typescript static initialDialogStateForUserAgentClient(outgoingRequestMessage: OutgoingRequestMessage, incomingResponseMessage: IncomingResponseMessage): DialogState; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | outgoingRequestMessage | OutgoingRequestMessage | Outgoing request message for dialog. | | incomingResponseMessage | IncomingResponseMessage | Incoming response message creating dialog. | Returns: `DialogState`