[Home](./index.md) > [sip.js](./sip.js.md) > [SubscriptionDialog](./sip.js.subscriptiondialog.md) > [(constructor)](./sip.js.subscriptiondialog._constructor_.md) ## SubscriptionDialog.(constructor) Constructs a new instance of the `SubscriptionDialog` class Signature: ```typescript constructor(subscriptionEvent: string, subscriptionExpires: number, subscriptionState: SubscriptionState, core: UserAgentCore, state: DialogState, delegate?: SubscriptionDelegate); ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | subscriptionEvent | string | | | subscriptionExpires | number | | | subscriptionState | SubscriptionState | | | core | UserAgentCore | | | state | DialogState | | | delegate | SubscriptionDelegate | |