| 术语 | virtual call |
| 释义 | virtual call 虚呼叫；［选择呼叫］ The transfer of data between two terminals in a packetswitching network, the call being established and terminated at the user's request by means of agreed data protocols. The term “virtual” is used because, although the call appears to provide a connection between the terminals, the network transmission facilities are allocated to the connection only when packets are actually being transferred over it. 包交换网络中两个终端间的数据传输。用户请求建立或中止虚呼叫时是按约定的数据协议进 行的。之所以称为虚呼叫，是因为尽管这种呼叫提供两个终端间的连接，但是，网络传输设 施只在信息包实际传送时才分配给这一连接。 |
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