User manual

MX-ONE SYSTEM DESCRIPTION
80 21/1551-ASP 113 01 Uen N2 2014-01-28
HLR redundancy (Home Location Register redundancy), or HLR
backup, is a unique MX-ONE feature for IP extensions based in the
same concept of HLR/VLR (Home Location Register / Visitor Loca-
tion Register) from Mobile networks.
In a multi-server system it allows the possibility to register IP exten-
sions with another Telephony Server (backup HLR), if the ordinary
HLR server cannot be accessed. The feature is supported for
H.323 and SIP extensions.
• Virtualization
A variant of Server redundancy and high availability can also be
achieved by using the VMware Virtual Appliance functionality. See
the description of MX-ONE Telephony server virtuaIization for
details.
Figure 20:Normal operation
Figure 21:Hardware failure in Server 2
Note: From MX-ONE 4.0, the database structure has been improved by
implementation of an internal LDAP database to store system
data including HLR data. The data is now replicated across all
servers, to insure no single point of failure if the user's "home