The telephone set 2 wherein {HEAD ~ said self regulation means} comprises means for controlling the degree of attenuation of the first attenuator of {TAIL ~ the respective channel} 
The telephone set 2 wherein { HEAD ~ said self regulation means } comprises means for controlling the degree of attenuation of the first attenuator of { TAIL ~ the respective channel }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL