This appendix contains information on the general use of features for the 4400-Series, MLX, ETR, MLS, analog multiline, and single-line telephones. It covers telephone and operator features and the acceptable programming codes for each. It also describes how to program these features on 4400-Series, MLX, ETR, and MLS telephones.

The following sections provide general instructions for feature use on 4400-Series, MLX, ETR, MLS, and single-line telephones. Features can be used in the following ways:

• Pressing a fixed feature button.
• Pressing a programmed button.
• Dialing the feature code.

Topics
	General Feature Use Information
	General Feature Use and Telephone Programming: Fixed Features General Feature Use and Telephone Programming: Programmed Buttons General Feature Use and Telephone Programming: Feature Codes
	Telephone and Operator Features
	Telephone and Operator Features for MLX Telephones Telephone and Operator Features for Multiline 4400-Series Telephones Telephone Features for 4400, 4400D, and Single-Line Telephones Telephone Features for ETR and MLS Telephones
	Telephone Programming
	Programming Methods Programming 4406D+ Telephones Programming 4412D+, 4424D+, and 4424LD+ Telephones by Using the Display Programming MLX-10 and MLX-5 Nondisplay Telephones Programming MLX Telephones by Using the Display Programming ETR and MLS Telephones Programming TransTalk MDW 9000 Telephones