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Hybrid or Key Systems were designed for companies with up to 50 employees. While a key system had all the core business telephony functions, they did not have some of the sophisticated applications such as ACD or hospitality. On the other hand the proprietary telephone handsets used on key systems were easier to use with dedicated keys for common functions like hold and transfer and LEDs to indicate incoming lines and if other users on the system were on the phone. Today the difference between key systems and PABXs is blurred with the major manufacturers offering digital hybrid systems which can be customized to provide either PABX or key system functionality as required and these hybrid systems meet the specific requirements of 99% of businesses. PABXs still dominant the large corporate environment where more than 1000 extensions are needed and companies that require their telephone system to integrate with specific and complicated applications like large call centres or hospitality front office applications.
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