Lucent Technologies DEFINITY Enterprise Communications Server Release 8.2 Administration For Network Connectivity Instructions Manual

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B Private Networking
This appendix contains five main sections: (1) a description of Distributed Communications 
System (DCS) and the features that can be used transparently on a DCS network, (2) a 
description of ISDN Plus networking capability, (3) a description of QSIG and its features, (4) a 
brief description of Centralized Voice Mail with Mode codes, and (5) a brief description of Japan 
TTC private networking...

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Distributed Communications System 
Distributed Communications System (DCS) allows you to configure 2 or more 
switches as if they were a single, large DEFINITY ECS. DCS provides attendant and 
voice-terminal features between these switch locations. DCS simplifies dialing 
procedures and allows transparent use of some of the DEFINITY ECS features. 
(Feature...

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DCS Features
Once you have connected and set up your DCS network, you can provide the 
following features across the network:
Alphanumeric Display for Terminals 
This feature allows calling-name display, called-name display, and miscellaneous 
identifiers to be transferred from a terminal on one node to a terminal on another 
node.
Attendant Control of Trunk...

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Automatic Callback 
DCS Automatic Callback allows a user at one node to make an automatic callback 
call to a user at another node in the DCS. 
A DCS Automatic Callback call can be initiated from a terminal at one node to a 
terminal at another node in the same way as if at a local node under the following 
conditions.
~If the called party is at a System 85,...

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Call Coverage 
DCS Call Coverage provides DCS messaging required for calls to be covered on 
remote systems when there is a DCS signaling link (BX.25, PPP, or ISDN-PRI) 
for the trunk groups. Calls to an extension on one system are covered by 
extensions on remote systems that are administered as coverage points.
Figure 4 shows an example of DCS Call Coverage....

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~When the DCS link is down, call consult operates differently. If Station A calls 
Station B but the call covers to Station C, then Station C consults back to 
Station B and Station B receives the consult call on the next call appearance.
~DCS Call Coverage does not support Coverage Call Back from a remote node.
Additionally, in some DCS Call Coverage...

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~A call to the principal redirects to the remote coverage point. While the remote 
coverage point is ringing, the principal answers the call. In this case the call is 
not cut through to the coverage point. Instead, ringing and ringback is removed 
from the coverage point and the call is cut through to the principal.
Call Forwarding 
DCS Call Forwarding allows...

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Multiappearance Conference/ Transfer 
DCS Multiappearance Conference/Transfer provides transparency for transferring 
calls and conferencing calls within a DCS network. A user in the DCS can initiate 
conference calls among or transfer calls originated from extensions in the DCS 
network to another extension within the DCS by dialing the UDP extension. (For...

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Interactions
•When interworking with non-ISDN trunks or non-Supplementary Service Option 
E ISDN trunks, DEFINITY acts as a gateway in the following sense:
~When a call is tandeming through a DEFINITY system from a non-ISDN 
trunk to an SSE trunk or from a non-Option E to an SSE trunk, the system acts 
as an incoming gateway.
~When a call is tandeming through a...

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ISDN/X.25 gateway
DEFINITY ECS can serve as an interface between PBXs that support the D-channel 
signaling feature and those that do not support this feature. The switch providing this 
interface is known as the ISDN-DCS Gateway node and provides backward 
compatibility to existing traditional DCS networks.
It maintains a mapping between processor channels and...