Chapter 2: System Overview Planning and Installation Guide
ShoreTel 11.1 47
2.12.1 Extension Monitoring Limitations
Note that there is a limit to the number of extensions that can be monitored, whether from
a ShorePhone-BB24 device or from a ShorePhone multiline phone. This limitation is
dependent on two factors:
Update rate (every call causes one or more monitoring phones to be updated)
Whether the monitoring phones are spread across one or more switches
ShoreTel switches support an update rate of 1 per second. This limit is independent of
whether the monitored extensions are on the same switch or a different switch. If the
monitored extensions are on a different switch, then IPDS is involved.
2.12.2 ShoreGear Voice Switch Feature Capacity
The ShoreGear voice switch is designed to handle the maximum load for the services it
provides. Some features place a higher real-time load on the ShoreGear voice switch
processor than others, and the use of these features must be carefully planned to take into
account the impact on the processing power of a switch to handle call control signaling
Table 2-5 offers some general guidelines for the number of extensions and group members
for several commonly used features. Keep in mind that in addition to observing these
limitations, you must stay below the real-time requirements of the switch itself. IP phones
Ringing a single user's IP phone is generates only one set of call control messages. However,
as the call rate increases, the load on the processor also increases. Note that the call rate is
the driving factor of load and not the length of a call. For instance, sixty calls placed over
one hour, with each call lasting one minute, is a much higher load on the processor than a
single call lasting one hour. Hunt Groups
Hunt groups place a significantly heavier burden on the ShoreGear voice switch. For
example, if you have a hunt group with 16 members, a single call into the hunt group will
generate 16 simultaneous calls (assuming the feature is configured to simultaneously ring
each hunt group member).
To extend this example, assume that the call stack size for this hunt group is set to 16, and
16 calls arrived at the same time, this would be equivalent to 256 calls (16 x 16)
simultaneous calls. The number of hunt group members (as well as the call stack depth) is
a multiplying factor for the signaling load that would be generated – thus, you should
closely engineer hunt groups to ensure that the voice switch is not overburdened in order
to ensure optimal performance.
Hunt Group Bridged Call Appearance Pickup Group IP Phones
Extension 8 24 16 120
Members / extensions 16 32 – phones on a switch
monitoring the same extension
24 N/A
Stack size/extensions 24 24 N/A 24
Total members on all extensions 16 N/A 80 N/A
Table 2-5 Feature Capacity
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