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

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Page 780 of 1536 Chapter 3 — DPNSS1/DASS2 features description <strong>and</strong> implementation<br />

On the MCDN side, TAT is initiated at Node 4. The call between A <strong>and</strong> C is<br />

bridged, <strong>and</strong> the redundant <strong>PRI</strong> trunks are removed between Node 4 <strong>and</strong><br />

Node 3. For the meantime, the non-optimised DPNSS1 trunks remain<br />

connected, as shown in Figure 112.<br />

Figure 112<br />

DPNSS1/MCDN RO/TAT Interworking scenario, after TAT has been applied<br />

2<br />

1<br />

Station A calls B<br />

Station A<br />

Station C<br />

Option 11<br />

Node 1<br />

Option 11<br />

Node 2<br />

DPNSS1<br />

DPNSS1<br />

Station C <strong>and</strong> A<br />

are bridged. Station C rings.<br />

Option 11<br />

DPNSS1<br />

2<br />

Node 3<br />

When TAT is completed on the MCDN side, The RO/TAT Interworking<br />

feature initiates RO on the DPNSS1 side by simulating a transfer at the<br />

gateway Node 3. The Three Party Service feature initiates signaling to update<br />

displays. Then, RO is initiated at Node 1, the originating node. The DPNSS1<br />

trunks are dropped between Node 3 <strong>and</strong> 2 <strong>and</strong> Node 3 <strong>and</strong> Node 1, with<br />

Station A <strong>and</strong> Station C being connected over one DPNSS1 trunk. This is<br />

shown in Figure 113.<br />

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

Trombed trunks<br />

are removed<br />

Option 11<br />

Node 4<br />

Station B<br />

553-8010.EPS

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