[Home](./index.md) > [sip.js](./sip.js.md) > [Invitation](./sip.js.invitation.md) ## Invitation class An invitation is an offer to establish a [Session](./sip.js.session.md) (incoming INVITE). Signature: ```typescript export declare class Invitation extends Session ``` ## Remarks The constructor for this class is marked as internal. Third-party code should not call the constructor directly or create subclasses that extend the `Invitation` class. ## Properties | Property | Modifiers | Type | Description | | --- | --- | --- | --- | | [body](./sip.js.invitation.body.md) | | string | undefined | Initial incoming INVITE request message body. | | [localIdentity](./sip.js.invitation.localidentity.md) | | NameAddrHeader | The identity of the local user. | | [logger](./sip.js.invitation.logger.md) | | Logger | Logger. | | [remoteIdentity](./sip.js.invitation.remoteidentity.md) | | NameAddrHeader | The identity of the remote user. | | [request](./sip.js.invitation.request.md) | | IncomingRequestMessage | Initial incoming INVITE request message. | ## Methods | Method | Modifiers | Description | | --- | --- | --- | | [accept(options)](./sip.js.invitation.accept.md) | | Accept the invitation. | | [dispose()](./sip.js.invitation.dispose.md) | | Destructor. | | [progress(options)](./sip.js.invitation.progress.md) | | Indicate progress processing the invitation. | | [reject(options)](./sip.js.invitation.reject.md) | | Reject the invitation. |