Software license for resale - no transfer of copyright. Optional add-on package for all ES communication systems (with the current release version)! Scope of services: Enables the activation of 3 internal boxes for fax reception, which can be freely assigned via call distribution. Includes fax-to-email function to send the received message as a PDF file to a desired destination address. System expansion to up to 3 (ES 5xx up, ES 54x, and ES PURE-IP) / 6 (ES 6xx, ES 7xx, ES 7xx plus) fax boxes is possible!.