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522 TRANSACTIONS IN INTELLIGENT NETWORKSFigure 17.2-1. Originating BCM.ends at points (E), which are the points where the call destination—either a lineattached to the SSP or a route set to the destination exchange—has been determined.We first describe “normal” call processing (no trigger encountered). Idle lines andtrunks are supervised by the SSP. When an origination attempt is detected, say, anoff-hook on an analog subscriber line (point A), the call process starts at the originatingnull state and moves to the collecting information state. In this state, SSP collectsthe information received from the calling customer (the digits dialed by an analogsubscriber, or the digits in the SETUP message from an ISDN user).The call then moves to the analyzing information state, where the call destinationis determined, from the analysis of the digits of the called number. If the destination