CPC Class Codes
H04L 2012/5618
Bridges, gateways [GW] or i...
H04L 2012/563
Signalling, e.g. protocols,...
H04M 2201/54
Object oriented software
H04M 2207/203
composed of PSTN and data n...
H04M 3/42
Systems providing special s...
H04M 3/42127
Systems providing several s...
H04M 3/42153
by subscriber
H04M 3/4217
Managing service interactions
H04M 3/4228
in networks
H04M 3/428
Arrangements for placing in...
H04M 3/48
Arrangements for recalling ...
H04M 3/56
Arrangements for connecting...
H04M 7/006
Networks other than PSTN/IS...
H04M 7/126
Interworking of session con...
H04M 7/129
Details of providing call p...
H04Q 2213/13003
Constructional details of s...
H04Q 2213/1305
Software aspects
H04Q 2213/13091
CLI, identification of call...
H04Q 2213/13097
Numbering, addressing
H04Q 2213/13102
Common translator
H04Q 2213/13103 :
Memory
H04Q 2213/13106 :
Microprocessor, CPU
H04Q 2213/1313 :
Metering, billing
H04Q 2213/1315 :
Call waiting
H04Q 2213/13156 :
Automatic digit redialling,...
H04Q 2213/13175 :
Graphical user interface [G...
H04Q 2213/13176 :
Common channel signaling, CCS7
H04Q 2213/13204 :
Protocols
H04Q 2213/1324 :
Conference call
H04Q 2213/1329 :
Asynchronous transfer mode,...
H04Q 2213/13298 :
Local loop systems, access ...
H04Q 2213/13345 :
Intelligent networks, SCP
H04Q 2213/13389 :
LAN, internet
H04Q 2213/13405 :
Dual frequency signaling, DTMF
H04Q 2213/13512 :
800 - freefone
H04Q 3/0041 :
involving techniques for av...
H04Q 3/0045 :
involving hybrid, i.e. a mi...
H04Q 3/0054 :
Service creation techniques
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