[Home](./index.md) > [sip.js](./sip.js.md) > [SubscriptionDialog](./sip.js.subscriptiondialog.md) > [initialDialogStateForSubscription](./sip.js.subscriptiondialog.initialdialogstateforsubscription.md) ## SubscriptionDialog.initialDialogStateForSubscription() 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 initialDialogStateForSubscription(outgoingSubscribeRequestMessage: OutgoingRequestMessage, incomingNotifyRequestMessage: IncomingRequestMessage): DialogState; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | outgoingSubscribeRequestMessage | OutgoingRequestMessage | | | incomingNotifyRequestMessage | IncomingRequestMessage | | Returns: `DialogState`