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Stored Information Elements (IEs)
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When a call arrives at SBC, the information contained in the incoming message (called number, calling number, name, etc.) is stored into variables within SBC. These variables are called Information Elements, a nomenclature lifted from ISDN definitions. So, for example, when a SIP call arrives, the number in the FROM header is stored in SBC's Calling Number IE. All arriving SIP headers or ISDN messages are similarly stored.
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