The present invention provides a method and apparatus for determining voice call spam, a method and service server for blocking voice call spam, a voice communication system that has applied the service server and a switch that is used in the voice communication system. The apparatus for determining voice call spam comprises: a pass code generating unit for generating a pass code; a pass code voice generating unit for generating corresponding voice based on said pass code generated by said pass code generating unit; and an acknowledge information receiving unit for receiving acknowledge information from a caller; wherein said voice call is determined as a voice call spam if said acknowledge information from said caller does not contain said pass code.