In the 5 to 40 employee range, key systems are more typical. This type of phone system uses a central control device called the key system unit (KSU) to provide features that are not available with ordinary phones. They also come standard with most features a business would expect.
If your business has fewer than 10 employees, you may be able to meet your telephone needs with a KSU-less system. This system is designed to provide many of the features of smaller commercial phone systems in a decentralized manner. They are also not permanently wired into your office, so you can easily unplug them and move to a new location.
Key systems and hybrids can range from $350 to $1000 per user, depending on the features you select, and KSU-less systems generally cost between $130 and $225 per office telephone.
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