A user terminal, the user terminal comprising a communication client application for managing communications with at least one further user terminal over a first network, the communication client application being configured to: determine with respect to at least one outgoing call the first network is a lower bandwidth data network; generate an interrupt message to be displayed; determine a user input in response to the interrupt message; and manage a placement of the communications with the at least one further user terminal over the first network based on the user input.