A telecommunications system comprising: a first base station and a second base station, both capable of communicating by radio with a first terminal unit; a telecommunications network capable of coupling the first base station to a second terminal unit over a first route and capable of coupling the second base station to the second terminal unit over a second route, whereby traffic data may be communicated between the first terminal unit and the second terminal unit via the first base station or the second base station; and a routing unit for determining whether the first terminal unit is to communicate with the second terminal unit via the first and second base stations in dependence on factors that include quality of at least part of the first and second routes.