The ESTOS ECSTA family of middleware components connects the proprietary world of established phone systems with the Microsoft Windows world. On a technical level this takes place through conversion of the CSTA protocol, which is made available by the phone system via an interface, into the Microsoft TAPI industry standard, which is supported by virtually all well-known application producers.ESTOS ECSTA drivers are the better alternative to manufacturers' middleware. They stand out for their simple set-up, transparent functionality, outstanding performance and extreme scalability.