When designing a solution using a Linux-based IP Office primary server, many aspects need to be considered for capacity. These include:
IP Office Subscription, IP Office Select or IP Office Server Edition deployment
Maximum extension, and user capacity required; both per server and solution
Maximum anticipated site/node capacity
Maximum trunk capacity
Hunt group quantity, size and location
The total concurrent VoIP call capacity
Call media destination location and type; both intermediate and final
Direct/indirect/secure VoIP media
Conference, and recording capacity
Multi-site Network link capacities
Call Destination
IP Infrastructure & VoIP QoS
Trunk utilization and call traffic profile
Resilience and Failover requirements
Available licenses
All should be assessed as one factor may limit another.