公开(公告)号：US4555594A

公开(公告)日：1985-11-26

申请号：US520112

申请日：1983-08-03

申请人： Albert Friedes ,  Thomas V. Greene ,  Frederick W. Idenden ,  Kenneth L. Moeller ,  Robert M. Musen ,  John F. O'Hara, Jr.

发明人： Albert Friedes ,  Thomas V. Greene ,  Frederick W. Idenden ,  Kenneth L. Moeller ,  Robert M. Musen ,  John F. O'Hara, Jr.

IPC分类号： H04Q3/00 ,  H04Q3/66 ,  H04M3/42

CPC分类号： H04Q3/665 ,  H04Q3/0016 ,  Y10S379/909

摘要： Disclosed are schemes for selecting an interexchange telephone call carrier, selecting a route to the selected carrier, and establishing a call path on the selected route to the selected carrier in a multicarrier environment. Call path establishment from an end office at which a call is originating to the carrier's office is accomplished via a multifrequency signaling scheme. If the call is an international call or the route is an indirect route to a carrier via an access tandem, following seizure of a trunk the end office outpulses thereon a first sequence of information that characterizes the subsequent route that the call should take, including identity of the interexchange or international carrier. After receiving a wink responsive to the first sequence, the end office outpulses a second sequence. If the call is a domestic call routed directly to a carrier, following seizure of the trunk the end office begins outpulsing with the second sequence. The second sequence generally contains information characterizing the source of the call, such as information on the class of service of the calling terminal and possibly Automatic Number Identification (ANI) code. Following the second sequence, the end office outpulses a third sequence of information characterizing the destination of the call, i.e., the called number, if such information is available. The end office then awaits receipt of an acknowledgment wink indicative of receipt by the interchange carrier of the second and selectively the third sequences. Upon receiving the acknowledgment wink, the end office cuts-through the call path to the trunk.

摘要翻译： 公开了用于选择互通电话呼叫载体的方案，选择到所选择的载波的路由，以及在多载波环境中在所选择的路由上建立到所选择的载波的呼叫路径。 通过多频信令方案来实现从呼叫始发到运营商办公室的终端局的呼叫路径建立。 如果呼叫是国际电话，或者该路由是经由接入串行到承运人的间接路由，则在检取中继线之后，终端局在其上推出描述呼叫应采取的后续路由的第一序列信息，包括身份 的互联网或国际运营商。 在收到响应第一个序列的闪烁之后，终端办公室会推出第二个序列。 如果呼叫是直接路由到承运人的国内呼叫，则在扣押中继线之后，终端办公室以第二个序列开始输出脉冲。 第二个序列通常包含表征呼叫源的信息，例如关于呼叫终端的服务等级和可能的自动号码识别（ANI）码的信息。 在第二个序列之后，如果这样的信息可用，终端局会突出表示呼叫目的地的第三个信息序列，即被叫号码。 然后，结束局等待接收到指示由交换运营商接收第二和选择性地第三序列的确认指示。 在接收到确认眨眼时，终端办公室切断通往干线的呼叫路径。