CCIE Practical Studies: Security (CCIE Self-Study)

ISDN Progress Field Values

Even the progress of an ISDN call is encoded into an ISDN progress field, except that the values are in binary instead of hexadecimal. Table C-5 lists the values used in the Progress Description field contained in the ISDN progress indicator information element.

Table C-5. ISDN Progress Description Field Values

Bits	Decimal Number	Description
0000001	1	Call is not end-to-end ISDN; further call progress information may be available in-band
0000010	2	Destination address is non-ISDN
0000011	3	Origination address is non-ISDN
0000100	4	Call has returned to the ISDN
0001000	8	In-band information or appropriate pattern now available
0001010	10	Delay in response at destination interface

All other values you might see in the Progress Description ...