This standard defines the usage, format, and encoding of the cause information element within the context of the Digital Subscriber Signaling System Number 1 (DSS1) of an Integrated Services Digital Network (ISDN). It also defines the meaning of specific causes, and the usage of the location and diagnostic fields.

ATIS T1-650-1995 (R2005)
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ISDN-Usage of the Cause Information Element in Digital Subscriber Signaling System Number 1 (DSS1)
The Alliance for Telecommunications Industry Solutions , 12/01/1995