User's Manual

Glossary
Centralized
Branch user model
This term describes aB5800 Branch Gateway deployment model where
certain 9600 Avaya SIP phones can use the B5800 Branch Gateway as
a survivability gateway. In normal operation, these phones register
directly to the Avaya Aura
®
Session Manager in the enterprise core and
get services from core applications such as the Communication Manager
Feature Server or Evolution Server. The local B5800 Branch Gateway
can still be accessed as a SIP gateway connected to the core Avaya
Aura
®
Session Manager to provide access to local PSTN trunks and
services when required. If WAN connectivity to the Avaya Aura
®
Session
Manager is lost, the SIP phones automatically register with and get
services from the B5800 Branch Gateway. When connection to the
Avaya Aura
®
Session Manager is available again, failback occurs where
the SIP phones return to being controlled by Avaya Aura
®
Session
Manager
Centralized
extension
See Survivable extension.
Centralized
management
This term is used to describe a central management system that delivers
a set of shared management services and provides a single access
interface to administer multiple branch locations and multiple distributed
or centralized B5800 Branch Gateway users.
Centralized
trunking
This term describes routing outgoing external calls from the branch sites
to the central site in order to utilize the central sites PSTN trunks. The
same applies for distributing incoming PSTN calls from the central site
to the appropriate branches.
Distributed
Branch user model
This term describes a B5800 Branch Gateway deployment model where
call processing for the branch phones is provided locally. Non-IP phones
are connected to B5800 Branch Gateway and IP and certain SIP
endpoints (not including the Avaya 9600 SIP phones) can be
administered with B5800 Branch Gateway as their controller. Access to
and from the rest of the Avaya Aura
®
network is via the B5800 Branch
Gateway system's Avaya Aura
®
Session Manager link across the
enterprise WAN. This connection allows for VoIP connectivity to other
B5800 Branch Gateway systems, to centralized trunking and to
centralized applications such as conferencing and Modular Messaging.
Distributed
trunking
This term describes the scenario where each branch retains and uses
its own PSTN trunks for incoming and outgoing external calls.
Implementing the Avaya B5800 Branch Gateway November 2011 339