[Home](./index.md) > [sip.js](./sip.js.md) > [InviteServerTransaction](./sip.js.inviteservertransaction.md) > [(constructor)](./sip.js.inviteservertransaction._constructor_.md) ## InviteServerTransaction.(constructor) Constructor. Upon construction, a "100 Trying" reply will be immediately sent. After construction the transaction will be in the "proceeding" state and the transaction `id` will equal the branch parameter set in the Via header of the incoming request. https://tools.ietf.org/html/rfc3261\#section-17.2.1 Signature: ```typescript constructor(request: IncomingRequestMessage, transport: Transport, user: ServerTransactionUser); ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | request | IncomingRequestMessage | Incoming INVITE request from the transport. | | transport | Transport | The transport. | | user | ServerTransactionUser | The transaction user. |