1. The client sends a SMS through the Internet portal or the IT application sets by default by the SMS operator. The SMS is sent through the interconnection of SMS operator with the mobile operator.
  2. When SMS is received, the mobile operator notifies to SMS operator the delivery of SMS in the mobile of destination.
  3. The SMS operator generates the acknowledgment of receipt and sends it to the Certification Service to stamp the timestamp, obtaining a signed and a stamped digital document.
  4. This acknowledgment of receipt is sent to the client by e-mail.