- DBL5001
TONE RINGER - DBL5002
TONE RINGER - DBL5009B
ON-HOOK AMPLIFIER - DBL5010
TONE RINGER WITH BRIDGE DIODE - DBL5015
COMPANDOR - DBL5015-V
Compandor - DBL5016
UNIVERSAL SPEECH NETWORK - DBL5018
POWER NARROW BAND - DBL5018-V
Low power narrow band FM IF - DBL5019
POWER NARROW BAND - DBL5019-V
Low power narrow band FM IF - DBL5020
VOLTAGE COMPANDER - DBL5020-V
Low voltage compander - DBL5021
UNIVERSAL SPEECH NETWORK - DBL5021-V
Universal speech network