Installation guide

38 Planning and Installation Guide ShoreTel 14.2
Planning and System Design Virtual Phone and Virtual Trunk Switches
2
Virtual Phone and Virtual Trunk Switches
The ShoreTel system supports virtual phone switches and virtual SIP trunk switches.
The virtual phone switch supports the following features:
 All non-TDM features (no physical trunks or analog phones)
 Up to 1000 IP phones per switch
 Requires the ShoreTel Virtual Switch Phone License
The virtual trunk switch supports up to 500 SIP trunks and requires the Virtual Switch SIP Trunk
license.
For virtual switch capacities and requirements, see Virtual Switches and Service Appliances on page
258.
BHCC Call Volume
BHCC per system is the total number of calls in the system during the busy hour including internal and
external calls and calls terminated to desk phones, softphones, trunks, or server applications such as
voicemail. This includes all traffic that can occur in the server - regular voice calls, workgroup calls,
voicemail etc. See Table 9 on page 37 for information about BHCC capacity for the different sizes of
ShoreTel systems.
BHCA Call Volume
Busy Hour Call Attempts (BHCA) is the number of calls attempted at the busiest hour of the day (peak
hour). The higher the BHCA, the higher the stress on the network processors. If a bottleneck in the
network exists with a capacity lower than the estimated BHCA, then congestion will occur resulting in
many failed calls and customer dissatisfaction.
ShoreTel systems support 5,000 BHCA.
Call Load Capacity for Switches
A ShoreTel system supports a maximum of 100 Voicemail Model Switches. There are no restrictions
concerning the allocation of switches among the sites defined by the system.
ShoreTel Voicemail Model Switches support the following call load capacities:
 5400 BHCC when supporting 90 MGCP IP Phones or 90 SIP Trunks.
 3600 BHCC when supporting 90 SIP IP Phones or 90 SIP Trunks.
Note
The virtual phone switch does not support the Nightbell or Overhead Paging features.