[Home](./index.md) > [sip.js](./sip.js.md) > [RegistererState](./sip.js.registererstate.md) ## RegistererState enum [Registerer](./sip.js.registerer.md) state. Signature: ```typescript export declare enum RegistererState ``` ## Enumeration Members | Member | Value | Description | | --- | --- | --- | | Initial | "Initial" | | | Registered | "Registered" | | | Terminated | "Terminated" | | | Unregistered | "Unregistered" | | ## Remarks The [Registerer](./sip.js.registerer.md) behaves in a deterministic manner according to the following Finite State Machine (FSM). ```txt __________________________________________ | __________________________ | Registerer | | v v Constructed -> Initial -> Registered -> Unregistered -> Terminated | ^____________| ^ |______________________________| ```