IPC Subgroup
H04M 3/5 Centralised arrangements for answering calls; Centralised arrangements for recording messages for absent or busy subscribers
Introduced: September 1968
Last revised: January 2006
Full Title
Automatic or semi-automatic exchanges > Systems providing special services or facilities to subscribers > Centralised arrangements for answering calls; Centralised arrangements for recording messages for absent or busy subscribers
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TELEPHONIC COMMUNICATION
3 direct subcodes
Child Classifications
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- H04M 3/51 Centralised call answering arrangements requiring operator intervention
- H04M 3/527 Centralised call answering arrangements not requiring operator intervention
- H04M 3/53 Centralised arrangements for recording incoming messages