Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
17-1
PRI Progress Indicator Transport
PRI Progress Indicator Transport
The PRI Progress Indicator Transport feature enhances the current ISDN
functionality by supporting the progress indicator information element (IE)
in the Q.931 PROGRESS message as it passes through the network. The
supported protocol variants are
• NTMCIPRI (MCIPRI)
• N449(PRI (ATTPRI)
• NTNAPRI (NAPRI)
• ETSIPRI
The purpose of the progress Indicator is to describe an event that occurs
during the life of the call. This feature provides the capability for the MWC
DMS-250 switch to transport the progress indicator IE across the CCS7
network by way of the access transport parameter (ATP). The originating
MCI DMS-250 converts the location value of the progress indicator. The
LOCATION_CODE_MAPPING in the OFCOPT table is set to Y. The
progress description value always maps according to the following tables.
The location value of the progress indicator maps as follows.
Table 17-
Mapping of location in progress indicator at the originating switch
Value sent from terminating
PRI user
Value sent to originating PRI user
0 –user 0–user
1–private network serving the local
user
5–private network serving the
remote user
Note:
This mapping applies to PRI-to-ISUP-to-PRI scenarios.
—continued—
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