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Chapter 3 — DPNSS1/DASS2 features description and implementation Page 791 of 1536
Feature administration
No new steps are required to configure the DPNSS1 Route
Optimisation/MCDN Trunk Anti-Tromboning Interworking feature.
However, the following basic configuration must be done:
• Configure MCDN Trunk Anti-Tromboning at the far-end switch, in
LD 17 (TAT is configured on a D-Channel basis, and not on a route
basis). Refer to the International ISDN PRI features description and
administration 553-2901-301
• Configure DPNSS1 Route Optimisation options, in LD 15. Refer to
DPNSS1 Administration Guide.
• Configure call display transfer indication for DPNSS1 Three-Party
Service, in LD 95. Refer to DPNSS1 Administration Guide.
• Optionally (to update terminal displays), configure Network Call
Redirection, using LD 15, LD 16, LD 95, LD 10, and LD 11. Refer
to the International ISDN PRI features description and
administration 553-2901-301
Feature Operation
There are no operating procedures specified for this feature.
DPNSS1 Step Back on Congestion
This feature has been developed to handle high traffic situations, when
DPNSS1 calls may encounter congestion. If a call over a DPNSS1 network is
blocked due to congestion, a Clear Request Message (CRM) is sent back to
the preceding node. A transit node or a DPNSS1/ISDN gateway node may
receive a CRM with a clearing cause of congestion. An originating node may
receive either a CRM containing a clearing cause of congestion, or a CRM
containing a clearing cause of Network Termination and a Loop Avoidance
Supplementary string. Depending on the SBOC option configured in overlay
86, the Electronic Switched Network overlay, the call may be passed back or
re-routed using the next free alternative route.
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