Patent classifications
H
ELECTRICITY
Load children
H04
ELECTRIC COMMUNICATION TECHNIQUE
Load children
H04M
TELEPHONIC COMMUNICATION
Load children
1/00
Substation equipment, e.g. for use by subscribers
Load children Filter patents View analytics View as hierarchy
H04M1/253
Telephone sets using digital voice transmission
Load children Filter patents View analytics View as hierarchy
H04M1/2535
adapted for voice communication over an Internet Protocol [IP] network
Filter patents View analytics View as hierarchy