The Studying And Realizing Of Crbt Project In The Fixed Telephone Network Of Shanghai Tietong Company

As the new value-added telecom service, The CRBT was first successfully applied to mobile network, whereafter applied to the fixed telephone network immediately. So Shanghai TieTong Company need develop CRBT service in the fixed telephone network of Shanghai TieTong Company.In this project, we need analyze and understand the principle of CRBT, and research on network makeup of CRBT Service and the trigger way of of CRBT Service in the fixed telephone network. We will make an introduction of the software and hardware of key apparatus SHLR in this project, then will analyze in depth data configuration that between telephone switch and SHLR, including physical link data, No.7 link data,trunk data, router PFX data, CRBT service trigger data related to CRBT. And we will analyze the telephone switch how to make the called number of this office trigger SHLR and colorful bell platforms AIP through configuring route PFX data and number PFX data. At the same time, we need configure the service data of triggering CRBT on SHLR, make SHLR finish registering and inquiring CRBT service of the called number, and to insert CRBT trigger code in front of the called number that will be send back telephone switch.In addition, we also need to analyze how to prevent telephone switch from touching off the CRBT twice on the telephone switch network. We have analyzed several kinds of ways of preventing telephone switch from trigger the CRBT twice. And we need decide to adopt the way of modifying address information indicator in the field form of called party's number to realize this function. Finally, we will analyze the call procedure of the whole CRBT.