Patent classifications
H
ELECTRICITY
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H04
ELECTRIC COMMUNICATION TECHNIQUE
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H04M
TELEPHONIC COMMUNICATION
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2203/00
Aspects of automatic or semi-automatic exchanges
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H04M2203/20
related to features of supplementary services
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H04M2203/2066
Call type detection of indication, e.g. voice or fax, mobile of fixed, PSTN or IP
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