contained in the ram storage ram which when dram storage is used includes a refresh unit refr and a refresh control indicated in the figure by an arrow labeled refr since as already mentioned the preprocessor ppe has low energy consumption and the other circuitry related components are controlled with low energy consumption in an idle or a standby state sby the energy consumption for the internet telephone it is significantly reduced in the standby state sby which results in considerable energy savings for an internet telephone it that is in a standby state sby for extensive time ranges i e with few telephone conversations within a day or week in this way an internet telephone it can be operated considerably more economically the energy consumption from the power supply system pss can be further reduced or eliminated for an internet telephone it in the standby state sby if the energy storage es is used in conjunction with the solar generator sg for this the solar generator sg and the energy storage es must be dimensioned in such a way that the internet telephone it in the standby state sby or standby mode can be supplied with energy e u2032 at least for a predetermined period of time the predetermined.