Question: In a Trunk Originated Call scenario, what condition(s) must be met for a CAMEL control relationship with gsmSCF(1) (GSM Service Control Function) to be established in the MSC (Mobile Switching Center)?
Option 1: Only when an active TO-CSI (Trunk Originated CAMEL Subscription Information) is present.
Option 2: When either an active TO-CSI for the trunk or an active N-CSI (Network CAMEL Subscription Information) is present, and trigger criteria (if any) are fulfilled.
Option 3: Automatically for all trunk originated calls, regardless of CSI presence or trigger criteria.
Option 4: Only if the call is successfully connected to the called party (B).
Explanation: This option correctly outlines the conditions necessary for establishing a CAMEL control relationship with gsmSCF(1) in the context of a trunk originated call. The presence of either an active TO-CSI specifically for the originating trunk or an active N-CSI, coupled with the fulfillment of any defined trigger criteria, are the prerequisites for initiating such a control relationship.