The Module CTCallBox meets all the demands of a professional, modern voice storage service. CTCallBox enables receiving, forwarding and listening to voice messages. Furthermore, a personal message box can be set up and configured individually. The CTCallBox's administration via the web interface (VAS GUI) allows the clients, among other things, to deploy appropriate accounts for their customers. Users of installed voicemail boxes can configure, check, forward, notify these by phone or browser (if a VAS-GUI has been provided). While the standard functionality already meets the high expectations of currently available carrier-grade voicemail solutions, the service can be adjusted or extended on request.