A key service unit, or KSU, is kind of old school but still useful for small businesses that need multiple phone lines.
A telephone system is a vital piece of infrastructure for any modern organization because it connects your business to clients and customers and allows your employees to communicate effectively with each other. A key system and private branch exchange (PBX) are the two primary phone systems used in today’s market. The best option for your business depends on your organization’s size, the number of handsets required, the call volume, and what type of features you need, such as voicemail, conference calls, and advanced call queuing. Here are the core differences between a key system and a PBX system.
