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ISDN Call Setup

Before traffic can pass through an ISDN network, an ISDN call must be set up. ISDN call setup requires a Layer 2 connection to be initialized and then a Layer 3 session to be established over the connection.

To specify the services and features to be provided by the service provider switch, you must set service profile identifiers (SPIDs) on TE1 devices before call setup and initialization. If you define SPIDs for features that are not available on the ISDN link, Layer 2 initialization takes place, but a Layer 3 connection is not established.

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