MF (Multi Frequency)

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A type of in-band signaling used on analog interoffice and 9-1-1 trunks.

Enhanced MF (Enhanced Multi-Frequency)

(Also called "E-MF")

The Enhanced MF signaling protocol, used on the E9‑1‑1 tandem-to-PSAP interface, is based on the Feature Group D (FG-D) protocol and supports the delivery of up to two 10-digit numbers, the first of which is preceded by two ANI information digits (i.e., ANI “II” digits).  Telcordia GR-2953-CORE

Note: combined two MF variants. Remove this note and change category to glossary when accepted