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The IAM (Initial Address Message) is sent to a destination endpoint and contains information needed for call setup. Within the IAM message are parameters labeled as Forward Call Indicators (FCI). Forward Call Indicators contain information relating to the characteristics of the connection, signaling path, and called party sent in the forward direction. This is a mandatory parameter in the IAM message which is used in countries that offer CUG (closed user group) service. The FCI Override object functions as explained below.
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