| 摘要 |
<p>PROBLEM TO BE SOLVED: To synchronize the different networks with each other to prevent the call clipping and to improve the call processing efficiency in an electric communication system where the different networks are connected to each other by delaying the message that is received via a virtual transport. SOLUTION: When a subscriber telephone set 112 calls a telephone set 178 and a signal transfer point 140 receives a call establishing signal message, a virtual transport server 150 stores a common channel signal message in a memory 182. When a prescribed time passed, a packet data network 190, i.e., a different network decides the establishment of a voice path between the calling and called sides and transmits a message to perform a call setting operation. Thus, the common channel signal message is delayed to establish a voice path before a call setting process is executed. As a result, the call setting operation is surely attained between the different electric communication network.</p> |
