Hybrid Key Telephone System

Nortel T Series Key System Telephone

Into the 21st century, the distinction between key systems and PBX systems has become increasingly blurred. Early electronic key systems used dedicated handsets which displayed and allowed access to all connected PSTN lines and stations.

The modern key system now supports SIP, ISDN, analog handsets (in addition to its own proprietary handsets - usually digital) as well as a raft of features more traditionally found on larger PBX systems. 

Their support for both analog and digital signaling, and of some PBX functionality gives rise to the hybrid designation.

A hybrid system typically has some call appearance buttons that directly correspond to individual lines and/or stations, but may also support direct dialing to extensions or outside lines without selecting a line appearance.

The modern key system is usually fully digital, although analog variants persist and some systems implement VOIP services. 

Effectively, the aspects that distinguish a PBX from a hybrid key system are the amount, scope and complexity of the features and facilities offered.

Hybrid systems are a common tool in the financial services industry used on trading floors. 

These advanced hybrid key systems generally only require attached PBXs for interaction with back-office staff and voicemail. 

These systems commonly have their front end units referred to as Turrets and are notable for their presentation of hoot-n-holler circuits. 

Multiple Hoots are presented to multiple users over multiplexed speakers to multiple locations.

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Hybrid Key Telephone System

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Oleh Haswell

Haswell 7:30 AM Comment