This table can be used as the next screening step after the Allowed SIOs, Allowed DPCs, or Blocked DPCs screening tables.

The Allowed ISUP Message Type record defines an ISUP message type that passes initial gateway screening.

This screening table is filtered with the EPR attribute.

To obtain all allowed ISUP records, set EPR to zero (0).

By default, the next screening step is a successful STOP EPR.

The Allowed ISUP Message Types table is the last available screening step for ISUP messages (SI=5)
 

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