We will discuss open string T-duality transformations via Buscher procedure, taking into account a non-trivial worldsheet boundary. We will address some technical details which will allow us to perform T-duality transformations discerning directions with Neumann and Dirichlet boundary conditions. We will illustrate this formalism and provide some examples by taking successive T-duality transformations on the three-torus with H-flux and by studying the corresponding dual backgrounds. This talk is based on 1806.01308.