A telecommunications system provides feature forwarding between a fixed telephone unit and a portable telephone unit that are assigned to the same prime telephone number. The female connector can include a female connector body defining a central passage. A heater core is disposed within the housing between the evaporator core and the outlet with the heater core having an upstream surface generally facing the evaporator core and a downstream surface generally facing the outlet. A sound pick-up hole is provided at the second section, through which the outer space communicates with an inner space of the housing body created between a sound pick-up section of the microphone and the second section. Under the auxiliary track 90 there is a second transfer ring for transferring a belt-tread assembly on the place 140 of assembly movably hand on the said track 90.