On a landline phone system, the number of lines determines the number of calls it can process. For IP-based phones, channels or trunks dictate how many simultaneous calls can be handled.
A trunk can be either inbound, outbound, or two-way. Many hosted PBX providers sell per user, at which point the type of trunk is irrelevant. That user will always have the ability to place and receive calls.
How to Determine Your Maximum Concurrent Call Volume
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