The request message for the operation execute(). The response message for the operation execute(). The request message for the operation getSimpleClientComponent(). The response message for the operation getSimpleClientComponent(). The request message for the operation getSimpleClientComponents(). The response message for the operation getSimpleClientComponents(). Execute the supplementary service. Get the GUI component for the simple VoIP client. Get all GUI components for the simple VoIP client.