Specifications

ENT_MLE_015989 - Ed 02_2014-10-13
Chapter 13: Topology – Network Services
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Alcatel-Lucent Enterprise Communication Solutions
April 2014 Offer
2 Distributed architecture with centralized call control
In a distributed architecture with centralized call control, only one communication server handles calls
(although it may be duplicated for standby) for all sites. The Alcatel-Lucent OmniPCX Enterprise
Communication Server is supported on an IP appliance server (IP AS), an IP rack server (IPRS), or an
IP crystal server (IPCS). The server is typically installed at the central site.
2.1 Basic architectural configurations
The platform choices for both communication servers and media gateways provide a maximum
number of combinations to fulfill customer needs. Among the main advantages are:
– Flexibility: platforms to meet any size of company up to 100,000 users (telephony features
are the same for all the users regardless of their location)
– Scalability: possible accumulation of media gateways either linked via IP or TDM
– Backup: possible separation of platforms:
o Between communication servers and media gateways (the server is placed in the
Application Server for best maintenance and backup practices)
o Between main and standby communication servers for geographical separation
(different physical locations, or “spatial redundancy—duplication”)
– Smooth transition from a full TDM to mixed or full IP configuration
A number of restrictions exist in mixing different kinds of platforms. They are summarized in the
following table:
Type of Communication
Server (CPU) in main
location
Main location
Secondary - remote -
location
IP Appliance Server or Blade
Center
Common hardware IP media
gateway
OR
Crystal IP media gateway
(possibly with one level of
peripheral Crystals)
Common hardware IP media
gateway
OR
Crystal IP media gateway
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Common hardware IP media
gateway
Common hardware IP media
gateway
IP Crystal Server
Crystal Communication Server
(possibly with two levels of
peripheral Crystals)
Common hardware IP media
gateway
OR
Crystal IP media gateway
IP Rack Server
Crystal IP media gateway
AND
Auxiliary media gateway (if
necessary)
Common hardware IP media
gateway
OR
Crystal IP media gateway
Possible example configurations are described in the following sections.