User's Manual

Failback This term is used for the situation where a centralized extension that is
working with a survivability call controller detects that its normal call
controller is available again. The extension will go through a process of
failback to its normal call controller.
Failover
This term is used for the situations where a centralized extension's
preferred call controller is no longer available. The extension will go
through a process of failover to the first available of its configured
alternate call controllers which then provides survivability services to the
extension.
Local extension
See Native extension.
Local
management
This term is used to describe managing a B5800 Branch Gateway device
using the local B5800 Branch Gateway Manager application.
Mixed Branch user
model
This term describes a B5800 Branch Gateway deployment model where
each B5800 Branch Gateway system can support extensions using the
Centralized Branch user model and extensions using the Distributed
Branch user model at the same time. The extensions supported in the
Centralized Branch user model are SIP extensions only. This user model
has also been referred to as a Concurrent Branch user model.
Mixed mode
trunking
The flexibility of Avaya Aura
®
Session Manager is such that both
centralized and distributed trunking can be used. For example, routing
all national and international calls via centralized trunking at the
headquarters site while still allowing local calls via the branch sites.
Native extension
This term is used to describe extensions that get their call services from
the branch site and operate in the Distributed Branch user model. A
native extension is also referred to as a local extension.
Rainy day This term refers to a loss of network connectivity from the branch to the
core data center. All endpoints are registered to the local B5800 Branch
Gateway. See Survivability.
Sunny day This term refers to full network connectivity from the branch to the core
data center. SIP endpoints are registered to the Avaya Aura
®
Session
Manager.
Survivable
extension
This term is used to describe an extension which, though physically
located at a branch site, receives its' telephony services from the central
or headquarters site and operate in the Centralized Branch user model.
A survivable extension is also called a centralized extension.
Survivability
This term describes centralized extensions when working after failover.
The range of functions available to the phones in this state depend
largely on those configured for them on the branch system and will not
Failback
340 Implementing the Avaya B5800 Branch Gateway November 2011
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