Nortel DMS-250 Reference Manual page 330

Digital switching systems
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17-10 Pri Progress Indicator Transport
This feature does not affect any existing functionality of incoming and
outgoing Q.931 PROGRESS messages.
Due to the specific functionality of the Q.931 PROGRESS message, the
ISDNPARM table cannot control this portion of the feature.
You can only turn this feature on if the office parameter
ATP_PROGRESS_IND in the OFCOPT table is set to Y.
The ISUP ACM and ISUP ANM are the only two ISUP messages that
support the transport of the progress indicator through the ISUP ATP.
297-2521-106 Standard 23.01 March 2001

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