| 摘要 |
PROBLEM TO BE SOLVED: To automatically charge at the charge of a communication provider, having the lowest charge in the extension of a calling origin. SOLUTION: When a trial result registration memory 164 is prepared, an extension telephone set 2-1 of a calling source extension performs transmission to a station line 3-1, and when also the number information of a calling destination does not correspond to the number information of each communication provider registered in a provider identification number registration table, a control part 15 stores charge information corresponding to an A company in the memory 164. The charge-comparing means 151 of the part 15 successively compares the charge information stored in the memory 164 with the charge information of each communication provider registered in the provider identification number registration table, and a charging control means 152 successively rewrites the recorded contents of the memory 164 into the charge information of the communication provider which is a low charge on the basis of the comparison results and performs charging processing of the extension of the calling source with the charge of the last registered communication provider, when rewriting is finished.
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