Ozeki SMS Gateway is software that connects business applications to mobile networks. It runs on Windows 10 or 11 or Windows Server and can also run on AWS, Azure or Google Cloud. Messages are exchanged with mobile operators and SMS providers over SMPP, UCP, CIMD2 or HTTP. Applications reach the gateway through an HTTP SMS API, SQL databases, email or text files.
Ozeki Systems Kft. is a Hungarian company with its head office in Debrecen. Because the software runs on servers the customer chooses, SMS traffic does not pass through the vendor's systems unless the customer selects a cloud environment, and the data location then depends on that provider. The vendor's website privacy statement mentions possible storage in the United States, which concerns website data rather than the product. The privacy page does not refer to the GDPR, and the vendor does not present the product as open source. For European organisations, it is an alternative to hosted SMS APIs such as Twilio or Vonage where the gateway must run on the organisation's own infrastructure.