Abstract: An equipment for facsimile call service of a telephone exchange which can apply an unique charging system to a facsimile call by distinguishing the facsimile call from ordinary speech calls, notify a caller of cause when occurring a failure in transmitting the facsimile call, and advise the caller on the way to eliminate the cause.

Abstract: A radiowave absorber comprises a porous ceramic matrix combined with carbon, where the carbon is combined on its surface and interior particularly in an amount not exceeding 2.7% by weight. A process for manufacturing a radiowave absorber is also disclosed. At least one kind of ceramic material selected from natural minerals or clay minerals, and artificial ceramic materials, is fired with a pore- or skeleton-forming material which can be burned away, whereby a sintered porous ceramic matrix is prepared. The matrix is fired in a furnace containing a reducing atmosphere and having a uniform temperature, while a gas or mist of hydrocarbon compound is introduced into the furnace.