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2.0 Mb DTI/PRI Administration and Maintenance Guide Book ... - Home

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Page 778 of 1536 Chapter 3 — DPNSS1/DASS2 features description <strong>and</strong> implementation<br />

DPNSS1 Route Optimisation/MCDN Trunk<br />

Anti-Tromboning Interworking<br />

The Digital Private Networking Signalling System No.1 (DPNSS1) Route<br />

Optimisation (RO)/Meridian Customer Defined Networking (MCDN) Trunk<br />

Anti-Tromboning (TAT) Interworking feature provides RO <strong>and</strong> TAT<br />

interworking at DPNSS1/MCDN gateway nodes.<br />

553-3011-315 St<strong>and</strong>ard 10.0 May 1999<br />

Note: For detailed information on the DPNSS1 Route Optimisation<br />

feature, please refer to the DPNSS1 Product Information <strong>Guide</strong> <strong>and</strong> the<br />

DPNSS1 <strong>Administration</strong> <strong>Guide</strong>. For detailed information on the Trunk<br />

Anti-Tromboning feature, please refer to the International ISDN <strong>PRI</strong><br />

features description <strong>and</strong> administration (for <strong>2.0</strong> <strong>Mb</strong>it applications), or<br />

the ISDN Primary Rate Interface description <strong>and</strong> administration (for 1.5<br />

<strong>Mb</strong>it applications.)<br />

RO/TAT interworking scenarios<br />

RO/TAT interworking within a DPNSS1 to MCDN gateway<br />

The following example presents a case where RO/TAT interworking occurs<br />

within a DPNSS1 to MCDN gateway.<br />

Note: In this example, we have used the case where a call has been<br />

redirected due to Network Call Transfer. The same functionality would<br />

apply if the call had been redirected by Network Call Forward No<br />

Answer, <strong>and</strong> Network Hunting, or modified by Network Call Transfer or<br />

Attendant Call Transfer.<br />

Referring to Figure 111, Station A, located at Node 1 on the DPNSS1 side of<br />

the DPNSS1/MCDN gateway, calls Station B located at Node 4 on the<br />

MCDN side of the gateway. It is to be assumed that the optimum DPNSS1<br />

route has been selected at the originating node (the case where a<br />

non-optimum route is selected is discussed in the note following Figure 112.)<br />

Station B activates Network Call Transfer to Station C, located at Node 2 on<br />

the DPNSS1 side of the gateway.<br />

Upon activation, the existing call is put on hold <strong>and</strong> a new call is originated<br />

to Station C. Station C Answers. Station B completes the call transfer, leaving<br />

A connected to C using two DPNSS1 trunks <strong>and</strong> two <strong>PRI</strong> trunks.

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