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Chapter 2: Planning and System Design
2.2.2
Considering System Topology
The topology in which your ShoreTel system is install can be a factor in determining
how you deploy the SA-100. For ShoreTel systems installed over multiple sites (a site
is an area managed by a ShoreTel server), whether those sites are in the same
building or spread across diverse geographical regions, it may be more effective and
efficient to install SA-100 units at specific sites. For example, if your experience
includes inconsistent WAN connections, limited WAN bandwidth or known WAN
quality issues, installing SA-100s at regional sites and implementing load balancing
can minimize the effect the WAN has on conference calls. Similarly, if your ShoreTel
system is servicing users in different cities or countries and many of the conferences
are held at local sites, you can save on long distance charges by installing SA-100s at
the local sites to handle local conferences.
NOTE We recommend that you do not install the SA-100 in a network where
latency exceeds 100ms. To operate the SA-100 optimally, network latency
and jitter must be minimized. Also we recommend that the ping lag time
between the SA-100 and the ShoreTel headquarters server does not exceed
200ms. This lag time affects how quickly Web pages refresh.
2.2.3
Considering Load Balancing
The ShoreTel system supports load balancing for conferences using the SA-100. The
ShoreTel system manages all calls in the system including conference calls from a
single source. That means that when a conference is initiated, the ShoreTel manager
can assess conference resources and shift the conference to an available SA-100 if the
local unit does not have sufficient resources.
2.2.4
Considering Redundancy
The ShoreTel SA-100 supports failover in cases where a unit loses connectivity or
fails. In the event of a loss of network connectivity or unit failure, the ShoreTel
system will redirect new conference calls to another SA-100 unit if resources are
available.
2.3
Licensing Requirements
Audio Conferencing and Web Conferencing services are enabled through keyed
licenses for Audio Conference ports and Web Conference ports. Licenses enable
concurrent access to the services, rather than per user or per appliance. Instant
Messaging is enabled through the use of Professional Access level and above.
Example: You have a single SA-100 which supports 50 G711 audio conference
These keys are added to the system in the same manner as existing keyed licenses.
ShoreTel 12.3
streams and 30 secure Web sessions. To run a concurrent audio/
secure Web conference for 30 participants would require 30 Audio
Conference and 30 Web Conference licenses.
SA-100 Planning, Installation, and Administration Guide
17
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