A user terminal associated with a first user, 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 incoming call whether a further user terminal at the call origin point comprises the communication client application; manage the reception of the call based on the determination of whether the further user terminal at the call origin point comprises the communication client application, and characterised in that: wherein the communication client application at the user terminal is further configured to generate an invite for the at least one further user terminal to install the communication client application when the determination of whether the further user terminal at the call origin point determines the further user terminal at the call origin point does not comprise the communication client application, and wherein the communication client application at the user terminal is configured to manage the reception of the call based on a determination of whether the further user terminal at the call origin point is further configured to trigger a call transfer such that the reception of the call uses the communication client application at the further user terminal over the first network when the further user terminal at the call origin point comprises the communication client application. determine with respect to at least one incoming call whether a further user terminal at the call origin point comprises the communication client application; manage the reception of the call based on the determination of whether the further user terminal at the call origin point comprises the communication client application, and characterised in that: wherein the communication client application at the user terminal is further configured to generate an invite for the at least one further user terminal to install the communication client application when the determination of whether the further user terminal at the call origin point determines the further user terminal at the call origin point does not comprise the communication client application, and wherein the communication client application at the user terminal is configured to manage the reception of the call based on a determination of whether the further user terminal at the call origin point is further configured to trigger a call transfer such that the reception of the call uses the communication client application at the further user terminal over the first network when the further user terminal at the call origin point comprises the communication client application. wherein the communication client application at the user terminal is further configured to generate an invite for the at least one further user terminal to install the communication client application when the determination of whether the further user terminal at the call origin point determines the further user terminal at the call origin point does not comprise the communication client application, and wherein the communication client application at the user terminal is configured to manage the reception of the call based on a determination of whether the further user terminal at the call origin point is further configured to trigger a call transfer such that the reception of the call uses the communication client application at the further user terminal over the first network when the further user terminal at the call origin point comprises the communication client application.