Reasons To Use Extensions
Since not all users dial out at the same time, sharing trunk lines is cheaper than giving each phone its own private landline. Extension to extension calls can be made and kept within the company for security reasons. Extensions make it easier for workers to bring their telephone number with them if they change offices in the building. Extensions allow personalized traffic and call accounting data to be captured by the PBX or a phone recorder to be used to optimize resources.
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