In order to provide a telecommunication control system for determining the most appropriate connection configuration according to a connection configuration requested by a caller terminal and a receiver terminal, the telecommunication control system comprises a caller priority call category judgment unit for generating a first priority call category identifier by judging a priority call category from first connection configuration information; a priority call category identifier notification unit for notifying a receiver side telecommunication control system of the first priority call category identifier; a requested call category judgment unit for judging a requested call category from a first priority call category identifier; a requested call category notification unit for notifying the receiver terminal of the requested call category; a receiver priority call category judgment unit for generating a second priority call category identifier from second connection configuration information; a connection call category judgment unit for judging a connection call category from the first priority call category identifier and second priority call category identifier; and a telecommunication establishment unit for making telecommunication established by the connection call category.