The system supports Caller ID. This feature is part of local telephone companies' Custom Local Access Signaling Service (CLASS). It provides a user with calling party number information from the central office when a call rings on a loop-start line connected to a module with Caller ID capability. This information appears on 4400-Series, MLX, ETR, and MLS display telephones, much like the PRI Automatic Number Identification (ANI).

Calling number and/or name identification is not available in all areas or jurisdictions. Check with your local telephone company. The availability of caller identification information may also be limited by the local-serving (caller's) jurisdiction, availability, or central office equipment.

The system also supports Calling Party Name, which is part of Caller ID. Calling Party Name does what its name suggests--it provides the name of the calling party. A button can be programmed on the multiline 4400-Series, MLX, ETR, and MLS telephones to toggle between Calling Party Number and Calling Party Name. When the button's LED is lit, Calling Party Name and not Calling Party Number information appears and will continue to appear until you press the button again (the LED turns off).

Topics
	Description
	Caller ID Modules LS-ID Delay Option Facilities Display Operation
	At a Glance
	Considerations & Constraints
	Mode Differences
	Feature Interactions