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Chapter 2: ShoreTel Architecture Call Scenarios
ShoreTel Maintenance Guide 15
directory
options
speed dial (due to its reliance on the database)
ability to change call handling modes
wrap up
monitoring extensions on other switches
presence information for user serviced by other switches
No configuration is necessary to enable the new Embedded IP Phone Display Driver
behavior. The change in functionality is transparent to the user.
2.4.3 Public Switched Telephone Network (PSTN) Failover
User extensions can be optionally configured to route extension-to extension calls to the
public switched telephone network (PSTN) in the event that an IP connection is
unavailable. Extension-to-extension calls are those a user makes to another site within a
multi-site system, for example, a user in New York calling a co-worker at the company’s San
Francisco office. The IP connection may be unavailable due to lack of bandwidth or
connectivity. The PSTN failover option must be explicitly enabled in the user’ Class of
Service and bypasses the caller’s call permissions. For systems using Distributed Routing
Service (DRS), destinations allowing PSTN failover handling return a contact list with a
failover number. When a site does not have connectivity to DRS, users at other sites with
DRS connectivity will be able to reach the users at that site using PSTN failover (as long as
the destination site has trunks to accept the PSTN calls). This limitation has the biggest
impact for small offices that do not have a local ShoreWare server.
2.4.4 Distributed CDR
In the event of a WAN outage, CDR data is stored for up to two hours on the distributed
server. When WAN connectivity is restored, the stored data is forwarded to the
Headquarters database. After two hours, the distributed server deletes the data and logs an
error to the NT event log.
2.4.5 For More Information
Also refer to Chapter 6, starting on page 97 for more information about failover. For
configuration details about PSTN failover configuration, CDR data, or IP phone
configuration, see the ShoreTel 8 Administration Guide.
2.5 Call Scenarios
To understand how the ShoreTel system processes calls, review the following call scenarios
and flow charts.
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