Telephone
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AEQ - Hybrids / ISDN
Broadcast Bionics - PhoneBOX Solo 
CircuitWerkes - Couplers / Teleradio
Comrex - Frequency Extender / ISDN / POTS Codec / SW56
Gentner - Telephone products now through Comrex
Henry Engineering - Information Announcers
JK Audio - Audio Taps / Couplers
Marti - POTS Codec
Musicam USA - ISDN / POTS Codec / SW56
Radio Sytems - Hybrids
RACOM - Answering Machines / Digital Announcers w/Remote Record
Sine Systems - Information Announcers
Telos -  Hybrids / ISDN