| 摘要 |
<p>The call is established by comparing the transmitted code of caller and called subscriber's number to a stored data, during reception of incoming call. A ringing signal is provided to called subscriber's communication instruments (17,18,19) during disconnection. The call is initiated at the moment of checking whether more than one simultaneous call initiations are performed consecutively in time shift. Subscriber's twin wires (La,Lb) are connected to call initiating communication instruments during call engaged state.</p> |
