Patent classifications
H
ELECTRICITY
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H04
ELECTRIC COMMUNICATION TECHNIQUE
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H04M
TELEPHONIC COMMUNICATION
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7/00
Arrangements for interconnection between switching centres
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H04M7/006
Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP) , including next generation networks with a packet-switched transport layer
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H04M7/0081
Network operation, administration, maintenance, or provisioning
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