[Home](./index.md) > [sip.js](./sip.js.md) > [Transaction](./sip.js.transaction.md) > [(constructor)](./sip.js.transaction._constructor_.md) ## Transaction.(constructor) Constructs a new instance of the `Transaction` class Signature: ```typescript protected constructor(_transport: Transport, _user: TransactionUser, _id: string, _state: TransactionState, loggerCategory: string); ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | \_transport | Transport | | | \_user | TransactionUser | | | \_id | string | | | \_state | TransactionState | | | loggerCategory | string | |