H04M 1/2745 using static electronic memories, e.g. chips
Introduced: January 2000
Full Title
Full titles differ between systems:
Substation equipment, e.g. for use by subscribers > Devices for calling a subscriber > Devices whereby a plurality of signals may be stored simultaneously > with provision for storing more than one subscriber number at a time > using static electronic memories, e.g. chips
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) > Devices for calling a subscriber (H04M1/66 takes precedence) > Devices whereby a plurality of signals may be stored simultaneously > with provision for storing more than one subscriber number at a time > using static electronic memories, e.g. chips
Of 8 combined children, 7 exist in both systems.
1 codes are CPC-only extensions.
1 shared codes have differing titles between IPC and CPC.
IPC defines codes here since 2000.
Child Classifications
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- H04M 1/27453 Directories allowing storage of additional subscriber data, e.g. metadata since 2020 IPC+CPC Available in IPC and CPC
- H04M 1/27485 Appending a prefix to or inserting a pause into a dialling sequence since 2020 IPC+CPC Available in IPC and CPC
- H04M 1/2749 Automatic dialling or redialling systems, e.g. on off-hook or redial on busy since 2020 IPC+CPC Available in IPC and CPC
- H04M 1/27495 implemented by means of discrete electronic components, i.e. neither programmable nor microprocessor-controlled (H04M1/27457-H04M1/2749 take precedence) since 2020 IPC+CPC Available in IPC and CPC
- H04M 1/275 implemented by means of portable electronic directories since 2000 IPC+CPC Available in IPC and CPC