Centrex Line

As a business begins to grow, it starts to require additional services, such as call transfer, call hold, and call waiting. The business can purchase a key-system or PBX, which starts at around U.S. $2000, or it can simply pay a few extra dollars every month (U.S. $20-$30) to the PSTN for additional services.

These services enable the PSTN to offer features in a Closed User Group (CUG). A CUG describes a situation where all the phones within the business become a virtual switch and can dial one another with only four or five digits, transfer calls, and put callers on hold. This service offers more functionality than a simple business line, but it usually becomes cost-prohibitive to implement as the company grows.

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