equipment and an indication unit 6a designated d which is controlled by the detection circuit 13a the telephone apparatus 1a is connected to the display apparatus 4a and to the picture telephone terminal apparatus 5a in the following the operation of the embodiment of fig2 is functionally described for the subscriber a where 34 a 34 represents the calling subscriber and 34 b 34 represents the called subscriber if the handset 14a of the telephone apparatus 1a is lifted off the hook switch 11 5 is activated and a call is transmitted from the picture telephone terminal apparatus 5a to the local exchange 8 the outgoing call is detected by the detection circuit 11 1 which initiates the detection circuit 13a through the gate circuit 11 3 if during the telephone communication the detection circuit 13a is receiving a signal and is identifying it as a picture telephone identification signal the result of the identification is indicated by the indication unit 6a d in the picture telephone apparatus and or in the television apparatus 4a in the following the operation of the embodiment which is shown in fig2 is functionally described for the subscriber b the detection circuit 11 2 of subscriber b detects a call which is incoming from a local exchange 8 through the picture telephone terminal apparatus 5b upon lift off of the handset 1a the output signal of the hook switch 11 5 and the output signal of the detection circuit 11 2 are supplied at the same time to the gate circuit 11 3 as a result the gate circuit 11 3 initiates the transmission of the picture telephone identification signal by.