Table of Contents
Advertisement
NCAUUI 14-13
be set to NSF_PRIVATE or NSF_TIE in the Q.931 SETUP message. If the
previous conditions are met, the call goes to the DAP for translation.
There are also two conditions that determine whether a call is FLEXSAC. In
table STDPRTCT, the PRERTSEL field must be set to SAC and the
SACFEAT field must be set to either FLEXFREE or FLEXFREM. If the
above conditions are met and NCS_ALLOW field in table STDPRTCT is set
to "Y," the NCAUUI calls immediately go to the DAP for routing purposes.
Thus bypassing the IMMDAPREQ field in table STDPRTCT and
FLEXSAC tables. If a NCAUUI call is FLEXSAC, but NCS_ALLOW is set
to "N" then NCAUUI is rejected. The DMS-250 sends a Q.931 RELease
message to the originating user with cause value of 21 "Call Rejected",
location code of "Transit", and coding standard of "CCITT".
If the DMS-250 does not activate VNET or FLEXSAC processing, the call
does not go to the DAP and the system rejects the NCAUUI request. The
DMS-250 switch sends a Q.931 RELease message to the originating user
with cause value of 21 "Call Rejected," location code of "Transit," and
coding standard of "CCITT."
The DAP validates the NCAUUI request. After the DAP validates NCAUUI
request, the DAP returns an ADF Routing Response or an ADF Suppcode
Response message that contains the subsequent address, TSID and TTG to
the DMS-250 switch.
If the DAP returns an ADF Suppcode Response message without the routing
information, the DMS-250 sends a second request to the DAP with the
suppcode filed in table MLTATTR for suppcode validation. If the switch
cannot get the suppcode digits from table MLTATTR, the switch sends a
Q.931 RELease message with cause value of 21 "Call Rejected," location
code of "Transit," and coding standard of "CCITT" to the originating user.
The ADF Suppcode Response message contains the number of suppcode
digits that the system requires. If the number of suppcode digits that the
Suppcode Response requires is greater than number of suppcode digits
entered in table MLTATTR, the DMS-250 switch sends a Q.931 RELease
message with cause value of 21 "Call Rejected," location code of "Transit,"
and coding standard of "CCITT" to the originating user.
After the DMS-250 obtains the required suppcode digits, the DMS-250
switch sends a second ADF DAL Request with the suppcode to the DAP. If
the suppcode is valid, the DAP returns a normal routing response.
Otherwise, the DAP returns an ADF Failure Response. Please refer to Figure
14 "Inswitch Suppcode Collection."
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
Advertisement
Table of Contents
