Substation equipment, e.g. for use by subscribers (subscriber services or facilities provided at exchanges H04M3/00; prepayment telephone coin boxes H04M17/00; current supply arrangements H04M19/08)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Substation equipment, e.g. for use by subscribers

CPC: Substation equipment, e.g. for use by subscribers (subscriber services or facilities provided at exchanges H04M3/00; prepayment telephone coin boxes H04M17/00; current supply arrangements H04M19/08)

Full Title

Full titles differ between systems:

IPC:

Substation equipment, e.g. for use by subscribers

CPC:

Substation equipment, e.g. for use by subscribers (subscriber services or facilities provided at exchanges H04M3/00; prepayment telephone coin boxes H04M17/00; current supply arrangements H04M19/08)

Of 20 combined children, 18 exist in both systems.

2 codes are CPC-only extensions.

6 shared codes have differing titles between IPC and CPC.

Child Classifications

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H04M 1/003 CPC only CPC only
H04M 1/006 CPC only CPC only
H04M 1/02 Constructional features of telephone sets +6 CPC IPC+CPC Available in IPC and CPC
H04M 1/24 Arrangements for testing IPC+CPC Available in IPC and CPC
H04M 1/247 Telephone sets including user guidance or feature selection means facilitating their use (user interfaces specially adapted for cordless or mobile telephones H04M1/724) since 2000 +5 CPC IPC+CPC Available in IPC and CPC
H04M 1/253 Telephone sets using digital voice transmission since 2000 +1 CPC IPC+CPC Available in IPC and CPC
H04M 1/26 Devices for calling a subscriber (H04M1/66 takes precedence) IPC+CPC Available in IPC and CPC
H04M 1/56 Arrangements for indicating or recording the called number at the calling subscriber's set IPC+CPC Available in IPC and CPC
H04M 1/57 Arrangements for indicating or recording the number of the calling subscriber at the called subscriber's set (at the operator set in a manual exchange H04M5/20) since 1974 +3 CPC IPC+CPC Available in IPC and CPC
H04M 1/58 Anti-side-tone circuits +1 CPC IPC+CPC Available in IPC and CPC
H04M 1/60 including speech amplifiers +4 CPC IPC+CPC Available in IPC and CPC
H04M 1/64 Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations (centralised dictation systems H04M11/10) +2 CPC IPC+CPC Available in IPC and CPC
H04M 1/66 with means for preventing unauthorised or fraudulent calling (verifying user identity or authority in secret or secure digital communications H04L9/32) IPC+CPC Available in IPC and CPC
H04M 1/68 Circuit arrangements for preventing eavesdropping IPC+CPC Available in IPC and CPC
H04M 1/71 Substation extension arrangements since 2021 IPC+CPC Available in IPC and CPC
H04M 1/72 Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection IPC+CPC Available in IPC and CPC
H04M 1/738 Interface circuits for coupling substations to external telephone lines (H04M1/78 takes precedence) since 2000 +1 CPC IPC+CPC Available in IPC and CPC
H04M 1/78 Circuit arrangements in which low-frequency speech signals proceed in one direction on the line, while speech signals proceeding in the other direction on the line are modulated on a high-frequency carrier signal since 1974 IPC+CPC Available in IPC and CPC
H04M 1/80 Telephone line holding circuits since 2000 IPC+CPC Available in IPC and CPC
H04M 1/82 Line monitoring circuits for call progress or status discrimination since 2000 IPC+CPC Available in IPC and CPC