Abstract: A method is described for connecting at least three subscribers in, e.g., a conference call in time division multiplex (TDM) pulse code modulation (PCM) telecommunication switching systems. In each participating subscriber station a TDM signal having the instantaneous value of the speech signal amplitude is stored for one ring circuit signal period in that subscriber station. The stored TDM signal is subtracted from the TDM signal transferred over the section of the ring circuit connected to the foregoing subscriber station in the TDM time segment assigned to the conference call. Added to the difference signal, so obtained, is a TDM signal displaying the instantaneous value of the speech signal amplitude and, the composite TDM signal obtained in this way is transmitted from the aforementioned subscriber station. The latter subscriber station receives either the difference signal or the composite signal as a TDM signal having the instantaneous values of the speech signals of the conferees.