Avaya B5800 Bedienungsanleitung Seite 183

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detects that connection to the Avaya Aura
®
Session Manager is available again, it dynamically
registers with it and switches back to normal operation.
Important:
Branch Survivability Settings. Survivable extensions entering survivability mode with the
branch will occur in parallel with the branch loosing whatever centralized call control and
trunk services it was configured to receive from the Avaya Aura
®
Session Manager.
Therefore the calls and call routing applied to both native and survivable extensions may be
limited. See PSTN Trunk Fallback on page 330.
Internal calls
Though physically located at a branch, during normal operation a survivable extension's calls
are routed by the Avaya Aura
®
Session Manager and Communication Manager Feature Server
rather than the B5800 Branch Gateway. Therefore there are some considerations for the
routing of calls between native and survivable extensions.
The table below summarizes the possible scenarios for calls between native and survivable
extensions:
Extension Type Dialed
Number
Notes
Call from... Call to...
Native Native 2XX Dial the extension number as shown on the
target extension. The call routing is done by
the local branch.
The call is sent to the matching native
extension number. If no match is found then
it is checked against system and user short
codes.
No additional configuration is required.
8XXXX Dial the extension number as shown but with
the branch prefix added.
The configuration shown in the section Initial
configuration for a Centralized Branch on
page 95 covers the routing necessary for
inter-branch calls.
If the call begins with the branch's own prefix,
the prefix is removed by the branch and the
remaining number is treated the same as the
scenario above. If the call begins with
another branch's prefix, the routing to the
appropriate branch is done by the Avaya
Aura
®
Session Manager.
Survivable extensions
Implementing the Avaya B5800 Branch Gateway November 2011 183
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