Installation guide

40 Planning and Installation Guide ShoreTel 14.2
Planning and System Design ShoreTel Voice Switch Feature Capacity
2
Hunt Groups
Hunt groups place a significantly heavier burden on the ShoreTel 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.
You can have 8 hunt groups on a switch. Each hunt group can have up to 16 members and each hunt
group can have a call stack of 24. The maximum number of members across all groups on the switch
also has to remain below 16. For instance, you could have one hunt group of 16 members or 2 hunt
groups with 8 members each.
Bridged Call Appearances
With Bridged Call Appearances (BCA), additional processor load is related to the call control signaling
transmission to the buttons that have been programmed on the ShoreTel IP phones. If a single BCA
with a call stack of one is configured on a phone, this represents one load. However, if that same BCA
were to appear on 24 different phones, that would represent 24 times more call signaling load than if
the BCA were to appear on one phone.
The switch is capable of handling 24 BCAs, with a call stack depth of 24 and up to 32 phones
monitoring a single BCA. If there are no hunt groups on the switch, it is possible for the switch to
support up to 160 buttons programmed to monitor BCAs.
Pickup Groups
Pickup Groups place an additional load on the processor related to tracking the extensions in the
group (although the actual real-time load is rather light and is not factored into the real time equation).
The switch is capable of supporting 16 pickup groups with a maximum of 24 members in the group.
The total number of members in all groups on the switch must not exceed 80.
Real Time Capacity
In addition to the overall feature capacity limit, you should calculate the real-time load on the switch
using the formula below:
For example, with the following configurations:
 A hunt group with four members and a call stack of four.
 A second hunt group with eight members and a call stack of three.
 Ten phones, each monitoring four BCA.