Patent ID: 7860227
Filing Date: 2010-12-28
Classification: H04M

Abstract:
1. A telephone exchange system including a first telephone exchange apparatus, a second telephone exchange apparatus, and an accounting apparatus, the first telephone exchange apparatus being connected to the second telephone exchange apparatus via a private network, the system comprising: a first transmitting device in the first telephone exchange apparatus, configured to issue a unique call identification information item when the first telephone exchange apparatus receives a call issue request from a connected terminal, and to transmit the call identification information item to the second telephone exchange apparatus being connected to a public network; a second transmitting device in the first telephone exchange apparatus, configured to transmit (i) the call identification information item, (ii) a first call direction identifying information item which identifies a call direction between the terminal and the private network, and (iii) a first accounting information item for a call of the terminal to the accounting apparatus if the first telephone exchange apparatus receives a call disconnect request from the terminal, and to transmit the disconnect request to the second telephone exchange apparatus; and a third transmitting device in the second telephone exchange apparatus, configured to transmit (i) the call identification information item, (ii) a second call direction identifying information item which identifies a call direction between the private network and the public network, and (iii) a second accounting information item for the call of the terminal to the accounting apparatus if the second telephone exchange apparatus receives the disconnect request, wherein the accounting apparatus is configured to determine the first and the second accounting information items are accounting information items for same call on the basis of the received call identification information items and the received first and second call direction identifying information items, and to sum up the first and the second accounting information items in order to form accounting information of the call of the terminal if the first and the second accounting information items are the accounting information items for same call.