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14-6 NCAUUI
terminating D–channel interface
In this case, the DMS-250 sends a Q.931 RELease message with a cause
value of 42 "Switching Equipment Congestion," location code of "Transit
and coding standard of "CCITT."
If TSCBs are not available in the XPM, the DMS-250 rejects the NCA-TSC
request by way of a Q.931 Release COMPlete message with a cause value of
42 "Switching Equipment Congestion," location code of "Transit and coding
standard of "CCITT."
If the originating user sends a NCAUUI request in the Q.931 SETUP
message and the terminating agency is not ISDN PRI agency, the request is
denied by the DMS-250 by way of the Q.931 RELease message with cause
value 21 "Call Rejected," location code of "Transit" and coding standard of
"CCITT."
If the originating user sends a NCAUUI request in the Q.931 SETUP
message and the terminating agency is an ISDN PRI agency, but it is not
in-service, the request is denied by the DMS-250 by way of the Q.931
RELease message with cause value 21 "Call Rejected," location code of
"Transit" and coding standard of "CCITT."
If the DMS-250 receives a NCAUUI request in the Q.931 SETUP message
for a PRI user that is not subscribed, the DMS-250 switch denies the request
by way of the Q.931 RELease COMPlete message with cause value of 50
"Requested Facility Not Subscribed," location code of "Transit" and coding
standard of "CCITT."
297-2521-106 Standard 23.01 March 2001
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