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What is a Trunk Line?

A trunk line is one specific connection or set of connections to a PBX. This may also reflect the number of phone calls that a trunking system can handle at the same time.

Alternatively, a trunk line may denote specific derivations in a standard trunking service. A campus-based operation may distribute calls based on which trunk line is needed to reach the phone. In this case each building has a trunk.

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