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  • H04M3/00
    		•  Automatic or semi-automatic exchanges [2024.01] HB CC 5K201
  • H04M3/00@A
    		•  Switching in general HB CC 5K201
  • H04M3/00@B
    		•  Integrated switching, inter-network connection HB CC 5K201
  • H04M3/00@C
    		•  Signalling system between the subscriber terminal and switch HB CC 5K201
  • H04M3/00@D
    		•  Network management HB CC 5K201
  • H04M3/00@E
    		•  related to maintenance, drive, and operation HB CC 5K201
  • H04M3/00@Z
    		•  Others HB CC 5K201
  • H04M3/02
    		•  .Calling substations, e.g. by ringing (selective calling H04Q) HB CC 5K037
  • H04M3/02@A
    		•  characterized by generation or transmission of ringing HB CC 5K037
  • H04M3/02@B
    		•  characterized by the ring trip system HB CC 5K037
  • H04M3/02@Z
    		•  Others HB CC 5K037
  • H04M3/04
    		•  ..the calling signal being supplied from the final selector HB CC 5K037
  • H04M3/06
    		•  ..the calling signal being supplied from the subscriber's line circuit HB CC 5K037
  • H04M3/06@A
    		•  characterized by generation or transmission of ringing HB CC 5K037
  • H04M3/06@B
    		•  characterized by the ring trip system HB CC 5K037
  • H04M3/06@Z
    		•  Others HB CC 5K037
  • H04M3/08
    		•  .Indicating faults in circuits or apparatus HB CC 5K019
  • H04M3/10
    		•  ..Providing fault- or trouble-signals HB CC 5K019
  • H04M3/12
    		•  ..Marking faulty circuits "busy"; Enabling equipment to disengage itself from faulty circuits HB CC 5K019
  • H04M3/14
    		•  ..Signalling existence of persistent "off-hook" condition HB CC 5K019
  • H04M3/16
    		•  .with lock-out or secrecy provision in party-line systems HB CC 5K201
  • H04M3/18
    		•  .with means for reducing interference; with means for reducing effects due to line faults HB CC 5K201
  • H04M3/20
    		•  .with means for interrupting existing connections; with means for breaking-in on conversations HB CC 5K201
  • H04M3/20@A
    		•  using a space division switch HB CC 5K201
  • H04M3/20@B
    		•  using a time division switch HB CC 5K201
  • H04M3/20@C
    		•  Interrupt control HB CC 5K201
  • H04M3/20@D
    		•  .Multi-interrupt prevention HB CC 5K201
  • H04M3/20@E
    		•  .Interrupt control depending on the class HB CC 5K201
  • H04M3/20@F
    		•  Interrupt trunk HB CC 5K201
  • H04M3/20@G
    		•  Transmission of the interrupt indication signal HB CC 5K201
  • H04M3/20@Z
    		•  Others HB CC 5K201
  • H04M3/22
    		•  .Arrangements for supervision, monitoring or testing HB CC 5K019
  • H04M3/22@A
    		•  Transfer of the remote observation control information HB CC 5K019
  • H04M3/22@B
    		•  for change-over to the standby equipment HB CC 5K019
  • H04M3/22@C
    		•  for traffic regulation HB CC 5K019
  • H04M3/22@Z
    		•  Others HB CC 5K019
  • H04M3/24
    		•  ..with provision for checking the normal operation HB CC 5K019
  • H04M3/26
    		•  ..with means for applying test signals HB CC 5K019
  • H04M3/26@A
    		•  Testing of the channel system HB CC 5K019
  • H04M3/26@B
    		•  Testing of the signal system HB CC 5K019
  • H04M3/26@C
    		•  Remote test HB CC 5K019
  • H04M3/26@D
    		•  Connection between unit under test and testing device HB CC 5K019
  • H04M3/26@E
    		•  Test call generation, e.g. dummy call device HB CC 5K019
  • H04M3/26@F
    		•  Wiring inspection HB CC 5K019
  • H04M3/26@G
    		•  Testing on a digital switch HB CC 5K019
  • H04M3/26@Z
    		•  Others HB CC 5K019
  • H04M3/28
    		•  ...Automatic routine testing HB CC 5K019
  • H04M3/30
    		•  ....for subscribers' lines HB CC 5K019
  • H04M3/32
    		•  ....for lines between exchanges HB CC 5K019
  • H04M3/34
    		•  ...Testing for cross-talk HB CC 5K019
  • H04M3/36
    		•  ..Statistical metering, e.g. recording occasions when traffic exceeds capacity of trunks HB CC 5K019
  • H04M3/36@A
    		•  Traffic volume measurement HB CC 5K019
  • H04M3/36@B
    		•  Traffic volume observation and control HB CC 5K019
  • H04M3/36@C
    		•  Traffic volume audit, e.g. traffic recording HB CC 5K019
  • H04M3/36@Z
    		•  Others HB CC 5K019
  • H04M3/38
    		•  .Graded-service arrangements, i.e. some subscribers prevented from establishing certain connections (queuing arrangements H04Q 3/64) HB CC 5K201
  • H04M3/40
    		•  .Applications of speech amplifiers HB CC 5K201
  • H04M3/42
    		•  .Systems providing special services or facilities to subscribers (specially adapted for wireless communication networks H04W 4/00) HB CC 5K201
  • H04M3/42@A
    		•  Special service functions concentrated into the upper station HB CC 5K201
  • H04M3/42@B
    		•  Transmission of the special service signal to the subscriber HB CC 5K201
  • H04M3/42@Q
    		•  .Notification using audible sound or voice HB CC 5K201
  • H04M3/42@R
    		•  .Notification using a visible signal HB CC 5K201
  • H04M3/42@S
    		•  .Termination type notification HB CC 5K201
  • H04M3/42@T
    		•  .Caller information notification HB CC 5K201
  • H04M3/42@C
    		•  Reception of the special service signal from the subscriber terminal HB CC 5K201
  • H04M3/42@D
    		•  Registration, change, or cancellation of the subscriber service class HB CC 5K201
  • H04M3/42@U
    		•  .Subscriber presence/absence; location; vacant/blocked registration or indication HB CC 5K201
  • H04M3/42@E
    		•  Connection control performed by verifying the subscriber service class and registration number HB CC 5K201
  • H04M3/42@F
    		•  Call waiting, add-on HB CC 5K201
  • H04M3/42@G
    		•  Pair type communication, hot line, special CB system HB CC 5K201
  • H04M3/42@W
    		•  Line reservation HB CC 5K201
  • H04M3/42@J
    		•  storing messages and reports then transmitting them to the terminating party (voice mailbox) HB CC 5K201
  • H04M3/42@K
    		•  Step call (reset call), series call HB CC 5K201
  • H04M3/42@L
    		•  Reconnection when the called party does not respond HB CC 5K201
  • H04M3/42@M
    		•  Call pickup HB CC 5K201
  • H04M3/42@N
    		•  Substitute response, interception HB CC 5K201
  • H04M3/42@P
    		•  Voice recognition HB CC 5K201
  • H04M3/42@Z
    		•  Others, e.g. time notification HB CC 5K201
  • H04M3/42,101
    		•  ..Layout for the command connection service HB CC 5K201
  • H04M3/42,102
    		•  ..Layout for the paging connection service HB CC 5K201
  • H04M3/42,103
    		•  ..Layout for call countermeasure HB CC 5K201
  • H04M3/424
    		•  ..Arrangements for automatic redialling (at the subscriber's set H04M 1/27) [7] HB CC 5K201
  • H04M3/428
    		•  ..Arrangements for placing incoming calls on hold [7] HB CC 5K201
  • H04M3/432
    		•  ..Arrangements for calling a subscriber at a specific time, e.g. morning call service [7] HB CC 5K201
  • H04M3/436
    		•  ..Arrangements for screening incoming calls [7] HB CC 5K201
  • H04M3/44
    		•  ..Additional connecting arrangements for providing access to frequently-wanted subscribers, e.g. abbreviated dialling (at the subscriber's set H04M 1/27; automatic redialling H04M 3/424) [1,7] HB CC 5K201
  • H04M3/46
    		•  ..Arrangements for calling a number of substations in a predetermined sequence until an answer is obtained HB CC 5K201
  • H04M3/48
    		•  ..Arrangements for recalling a calling subscriber when the wanted subscriber ceases to be busy HB CC 5K201
  • H04M3/48@A
    		•  Double camp-on prevention HB CC 5K201
  • H04M3/48@B
    		•  Waiting when the outgoing trunk or bi-directional trunk is busy HB CC 5K201
  • H04M3/48@Z
    		•  Others HB CC 5K201
  • H04M3/487
    		•  ..Arrangements for providing information services, e.g. recorded voice services or time announcements [7] HB CC 5K201
  • H04M3/493
    		•  ...Interactive information services, e.g. directory enquiries [7] HB CC 5K201
  • H04M3/50
    		•  ..Centralised arrangements for answering calls; Centralised arrangements for recording messages for absent or busy subscribers (H04M 3/487 takes precedence; centralised dictation systems H04M 11/10) [1,7] HB CC 5K201
  • H04M3/50@A
    		•  Voice automatic response device HB CC 5K201
  • H04M3/50@B
    		•  Recording the message for an absent person HB CC 5K201
  • H04M3/50@Z
    		•  Others HB CC 5K201
  • H04M3/51
    		•  ...Centralised call answering arrangements requiring operator intervention [7] HB CC 5K201
  • H04M3/52
    		•  ....Arrangements for routing dead number calls to operators HB CC 5K201
  • H04M3/523
    		•  ....with call distribution or queuing [7] HB CC 5K201
  • H04M3/527
    		•  ...Centralised call answering arrangements not requiring operator intervention [7] HB CC 5K201
  • H04M3/53
    		•  ...Centralised arrangements for recording incoming messages [7] HB CC 5K201
  • H04M3/533
    		•  ....Voice mail systems [7] HB CC 5K201
  • H04M3/537
    		•  ....Arrangements for indicating the presence of a recorded message [7] HB CC 5K201
  • H04M3/54
    		•  ..Arrangements for diverting calls for one subscriber to another predetermined subscriber HB CC 5K201
  • H04M3/56
    		•  ..Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities (video conference systems H04N 7/15) HB CC 5K201
  • H04M3/56@A
    		•  Connection layout HB CC 5K201
  • H04M3/56@D
    		•  .Time division type HB CC 5K201
  • H04M3/56@B
    		•  Voice synthesizing or mixing HB CC 5K201
  • H04M3/56@E
    		•  .Time division type HB CC 5K201
  • H04M3/56@F
    		•  ..N-1 addition system HB CC 5K201
  • H04M3/56@G
    		•  ..Maximum value control system HB CC 5K201
  • H04M3/56@C
    		•  TV telephone conference (TV telephone conference mainly with telephone; mainly with TV images H 04 N) HB CC 5K201
  • H04M3/56@Z
    		•  Others HB CC 5K201
  • H04M3/58
    		•  ..Arrangements for transferring received calls from one subscriber to another; Arrangements affording interim conversations between either the calling or the called party and a third party (substation line holding circuits H04M 1/80) [1,7] HB CC 5K201
  • H04M3/58@A
    		•  Call-back transfer HB CC 5K201
  • H04M3/58@B
    		•  Call-back HB CC 5K201
  • H04M3/58@Z
    		•  Others HB CC 5K201
  • H04M3/60
    		•  .Semi-automatic systems, i.e. systems in which the numerical selection of the outgoing line is under the control of an operator HB CC 5K063
  • H04M3/60@A
    		•  related to the cord switchboard HB CC 5K063
  • H04M3/60@C
    		•  related to the system of connection with the switchboard HB CC 5K063
  • H04M3/60@D
    		•  .Call distribution to the switchboard HB CC 5K063
  • H04M3/60@N
    		•  .Digital line connection HB CC 5K063
  • H04M3/60@P
    		•  .Connection using the voice storage and response means HB CC 5K063
  • H04M3/60@E
    		•  Switchboard connection system (signal transmission between the controller and switchboard) HB CC 5K063
  • H04M3/60@F
    		•  .Indication to the switchboard HB CC 5K063
  • H04M3/60@R
    		•  ..Visible indication HB CC 5K063
  • H04M3/60@Q
    		•  ..Audible indication HB CC 5K063
  • H04M3/60@G
    		•  .Transmission of the key information from the switchboard HB CC 5K063
  • H04M3/60@H
    		•  Special switchboards HB CC 5K063
  • H04M3/60@J
    		•  .for international calls (language support, etc.) HB CC 5K063
  • H04M3/60@K
    		•  .for operator training (dummy switchboard, etc.) HB CC 5K063
  • H04M3/60@L
    		•  .for reception of emergency calls to fire stations, police departments, etc. HB CC 5K063
  • H04M3/60@M
    		•  Details of the switchboard's electrical or mechanical structure HB CC 5K063
  • H04M3/60@Z
    		•  Others HB CC 5K063
  • H04M3/62
    		•  ..Keyboard equipment HB CC 5K063
  • H04M3/64
    		•  ..Arrangements for signalling the number or class of the calling line to the operator (between operators in inter-exchange working H04M 5/18) HB CC 5K063
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