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Page 798 of 1536 Chapter 3 — DPNSS1/DASS2 features description and implementation
Feature implementation
— LD86- In the ESN overlay, define the step back or re-routing options for
calls encountering congestion.
• In response to the SBOC prompt, enter NRR for no re-routing of
calls, enter RRO to re-route calls if at an originating node, or to step
back if at a transit node, or enter RRA to re-route calls if at all nodes.
• In response to the IDBB prompt, enter (DBA)/DBI to define the
alternative route sets for ISDN Drop Back Busy. DBA = all E-SET
routes may be used to route calls, DBI = only I-SET routes may be
used to route calls.
— LD15- In the Customer Data Block overlay, define the network blocking
treatment for calls stepped back to the originating node.
• In response to the NBLK prompt, enter four of the following
treatments: OVF, ATN, RAN, BSY, SRC1.SRC8. The default is
OVF, OVF, OVF, ATN.
DPNSS1/DASS2 Uniform Dialing Plan Interworking
The Digital Private Network Signaling System (DPNSS1)/Digital Access
Signaling System (DASS2) Uniform Dialing Plan (UDP) Interworking
feature enables DPNSS1 to use Uniform Dialing Plan numbering. The feature
allows DPNSS1 calls to be routed from a switch in one geographical location
to another switch in any other geographical location in a cost-effective and
easy-to-use manner via the Network Alternate Route Selection (NARS) and
Basic Alternate Route Selection (BARS) features.
The following NARS/BARS functions are supported by this development:
— On-network routing over DPNSS1 using a standardized dialing format
(Access Code (AC) - Location Code (LOC) - destination DN).
— Off-network routing and break-outs to supported public network
interfaces.
— Incoming DASS2 calls routed through the UDP DPNSS1 with NARS if
the received digits are in the format AC - LOC or AC-SPN Special
Number (SPN) - X...X, or if an Incoming Digit Conversion (IDC) table
is applied to generate a number in such a format. In this case, all NARS
functionalities supported on DPNSS1 apply to the incoming DASS2 call.
553-3011-315 Standard 10.0 May 1999