[Home](./index.md) > [sip.js](./sip.js.md) > [SubscriptionState](./sip.js.subscriptionstate.md) ## SubscriptionState enum [Subscription](./sip.js.subscription.md) state. Signature: ```typescript export declare enum SubscriptionState ``` ## Enumeration Members | Member | Value | Description | | --- | --- | --- | | Initial | "Initial" | | | NotifyWait | "NotifyWait" | | | Subscribed | "Subscribed" | | | Terminated | "Terminated" | | ## Remarks The [Subscription](./sip.js.subscription.md) behaves in a deterministic manner according to the following Finite State Machine (FSM). ```txt _______________________________________ Subscription | v Constructed -> Initial -> NotifyWait -> Subscribed -> Terminated |____________________________^ ```