| 摘要 |
PURPOSE:To attain the smooth switching with a simple connection processing by connecting the call switch connection to a desired terminal via a folded loop circuit when a call of a busy mode has talking with a third party. CONSTITUTION:Telephones A and B stored in digital switch modules SM1 and SM2 are connected each other via a connection line 1. Then a telephone C gives a call to the telephone A via a connection line 2 in a busy mode of the A. Thus the C is switched to a call waiting mode and connected to a folded loop circuit LT by the module SM1. Then a folded terminal of the circuit LT is connected to the telephone B and a 3-way trunk TWT respectively. Then the telephone A is connected to the telephone C via the line 2 after knowing a call incoming under communication and performing the hooking. Thus the talking is possible with the telephone A. While a waiting sound HST is connected to the telephone B via the line 1 and the circuit LT. Then the telephone A has hooking again after the talking is through with the telephone C, and the telephone A can have talking again with the telephone A. |
