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Multi-Function Module Feature

Description

When an MFM is set for tip/ring interface operation, only dual-tone multifrequency (DTMF) tip/ring devices can be used to make and/or receive inside and outside calls. The following types of DTMF devices can be used:

• Single-line telephones
• Modems
• Fax machines
• Credit card verification terminals
• Cordless single-line telephones
• Speakerphones that emulate a tip/ring device
• Answering machines

Topics
	Description
	Tip/Ring Interface Supplemental Alert Adapter Programming Requirements
	At a Glance
	Considerations & Constraints
	Mode Differences
	Telephone Differences
	Feature Interactions