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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H04M7/12
for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
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H04M7/1205
where the types of switching equipement comprises PSTN/ISDN equipment and switching equipment of networks other than PSTN/ISDN, e.g. Internet Protocol networks
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H04M7/121
Details of network access arrangements or protocols
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