In this paper we will explore how agile acceptance testing is applied in testing a high capacity network gateway. We will demonstrate how the organisation managed to grow agile acceptance testing testing from two colocated teams to 20+ multi-site team setup and how acceptance test driven development is applied to complex network protocol testing. We will also cover how the initial ideas that we had of agile acceptance testing evolved during product development. At the end of paper we give recommendations to future projects using agile acceptance testing based on feedback that we have collected from our first customer trials.