Aspects of automatic or semi-automatic exchanges

13 direct subcodes

Child Classifications

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H04M 2203/05 related to OAM&P
H04M 2203/10 related to the purpose or context of the telephonic communication
H04M 2203/15 related to dial plan and call routing
H04M 2203/20 related to features of supplementary services
H04M 2203/25 related to user interface aspects of the telephonic communication service
H04M 2203/30 related to audio recordings in general
H04M 2203/35 related to information services provided via a voice call
H04M 2203/40 related to call centers
H04M 2203/45 related to voicemail messaging
H04M 2203/50 related to audio conference
H04M 2203/55 related to network data storage and management
H04M 2203/60 related to security aspects in telephonic communication systems
H04M 2203/65 related to applications where calls are combined with other types of communication