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NCAUUI (Two switch scenario)
Overview
This feature provides Non Call Associated User-to-User Services between
PRI users that are located on two different switches in the network. The
Signaling Connection Control Protocol (SCCP) Class 2 Connection Oriented
protocol is used to set up a logical connection between two DMS-250 switch
nodes in the CSS7 network without setting up a voice circuit. Once the
logical connection is established between the two DMS-250 switch nodes,
information is transferred between the two DMS-250 switch nodes in either
direction.
Feature Description
NCAUUI provides a service which allows PRI users to communicate by
means of user-to-user signaling without setting up bearer channels at
network access and egress points. Only the NTMCIPRI and N449PRI PRI
variant originations and terminations are supported. Bearer channels are not
used when establishing an NCA-TSC from originating switch to a
terminating switch within the network due to the choice of transport
protocols. The implementation of an NCAUUI transport uses SCCP
Connection Oriented class 2 service.
Nortel Networks offers the NCAUUI feature on a subscription basis at the
trunk group level. After receiving a Q.931 SETUP message with an
NCAUUI request, the DMS-250 switch verifies that the originating user is
subscribed by way of table LTDATA before further processing the request.
After verifying that the originating user is subscribed to NCAUUI, the
DMS-250 switch sends an ADF DAL Request message to the DAP based on
VNET or FLEXSAC call processing. The DAP validates the ADF DAL
request for NCAUUI. After the ADF DAL request for NCAUUI is validated
by the DAP, the DAP returns an ADF Routing Response or an ADF
Suppcode Response containing the subsequent address, terminating switch
ID (TSID) and terminating trunk group (TTG) to the DMS-250 switch.
Upon receipt of a Q.931 SETUP message indicating NCAUUI, the
originating DMS-250 switch translates the received TSID into a destination
point code.
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
15-1
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