User manual

21/1551-ASP 113 01 Uen N2 2014-01-28 37
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ELEPHONY FEATURES
one signaling system to another. Connections using ISDN and H.323
signaling systems are considered a homogeneous network.
Systems 1 to 4 in the below figure are connected to each other using IP
networking (H.323 with additional proprietary signaling). Systems 5 and
6 are connected to the network through leased lines using ISDN with
QSIG signaling. All systems can have their own incoming and outgoing
external lines to the PSTN.
Figure 12:Private Network Features
The following documents include more information:
• Description for NETWORKING
• Description for IP NETWORKING
4.4.1 Centralized Attendant
Both local and centralized attendants can be used in a networked
scenario. A centralized attendant is an attendant shared by several PBX
systems. The advantage is that when the total traffic in a network is low,
all traffic can be routed to a central point, thus minimizing the number of
attendants. The feature can also be used in a global enterprise where all
calls are routed depending of the local time of day to those systems
where attendants are working.
In the example below there are three systems. System 1 has a full time
attendant, system 2 has a local part time attendant whereas system 3
does not have any local attendant. Incoming manual calls in system 3
are always routed to the centralized attendant in system 1. Incoming
manual calls in system 2 are when the local part time attendant is night
switched, routed to the centralized attendant in system 1 whereas, when
the attendant is day switched, the calls go to this local attendant.