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IPC entry: H04M 1/2745 4-dot subgroup [Version 2024.01 (current), Language EN - English]

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Symbol		Title
A		HUMAN NECESSITIES
B		PERFORMING OPERATIONS; TRANSPORTING
C		CHEMISTRY; METALLURGY
D		TEXTILES; PAPER
E		FIXED CONSTRUCTIONS
F		MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
G		PHYSICS
H		ELECTRICITY
H01		ELECTRIC ELEMENTS
H02		GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
H03		ELECTRONIC CIRCUITRY
H04		ELECTRIC COMMUNICATION TECHNIQUE
H04B		TRANSMISSION [4]
H04H		BROADCAST COMMUNICATION (multiplex communication H04J; pictorial communication aspects of broadcast systems H04N)
H04J		MULTIPLEX COMMUNICATION (peculiar to transmission of digital information H04L 5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N 7/08; in exchanges H04Q 11/00)
H04K		SECRET COMMUNICATION; JAMMING OF COMMUNICATION
H04L		TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) [4]
H04M		TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08)
H04M 1/00		Substation equipment, e.g. for use by subscribers (subscriber services or facilities provided at exchanges H04M 3/00; prepayment telephone coin boxes H04M 17/00; current supply arrangements H04M 19/08) [1, 7, 2006.01]
H04M 1/02		. Constructional features of telephone sets [1, 2006.01]
H04M 1/03		. . Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets [2, 2006.01]
H04M 1/04		. . Supports for telephone transmitters or receivers [1, 2006.01]
H04M 1/05		. . . specially adapted for use on head, throat or breast [1, 2006.01]
H04M 1/06		. . . Hooks; Cradles [1, 2006.01]
H04M 1/08		. . . . associated with switches operated by the weight of the receiver or hand-set [1, 2006.01]
H04M 1/10		. . . . associated with switches operated by magnetic effect due to proximity of receiver or hand-set [1, 2006.01]
H04M 1/11		. . Supports for sets, e.g. incorporating armrests [1, 2006.01]
H04M 1/12		. . . Adjustable supports, e.g. extensible [1, 2006.01]
H04M 1/13		. . . . pantographic [1, 2006.01]
H04M 1/14		. . . with resilient means to eliminate extraneous vibrations [1, 2006.01]
H04M 1/15		. . Protecting or guiding telephone cords [1, 5, 2006.01]
H04M 1/17		. . Hygienic or sanitary devices on telephone equipment (for mouthpieces or earpieces H04R 1/12) [2, 2006.01]
H04M 1/18		. . Telephone sets specially adapted for use in ships, mines, or other places exposed to adverse environment (H04M 1/19 takes precedence) [1, 2006.01]
H04M 1/19		. . Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor (circuit arrangements for preventing eavesdropping H04M 1/68; telephone cabinets E04H 1/14) [1, 2006.01]
H04M 1/20		. . Arrangements for preventing acoustic feedback (H04M 1/62 takes precedence) [1, 2006.01]
H04M 1/21		. . Combinations with auxiliary equipment, e.g. with clocks or memoranda pads [1, 2006.01]
H04M 1/215		. . . by non-intrusive coupling means, e.g. acoustic couplers [7, 2006.01]
H04M 1/22		. . Illumination; Arrangements for improving the visibility of characters on dials [1, 2006.01]
H04M 1/23		. . Construction or mounting of dials or of equivalent devices; Means for facilitating the use thereof (by improving visibility H04M 1/22) [1, 2006.01]
H04M 1/24		. Arrangements for testing [1, 2006.01]
H04M 1/247		. Telephone sets including user guidance or feature selection means facilitating their use (user interfaces specially adapted for cordless or mobile telephones H04M 1/724) [7, 2006.01, 2021.01]
H04M 1/253		. Telephone sets using digital voice transmission [7, 2006.01]
H04M 1/26		. Devices for calling a subscriber (H04M 1/66 takes precedence) [1, 7, 2006.01]
H04M 1/27		. . Devices whereby a plurality of signals may be stored simultaneously [2, 2006.01]
H04M 1/272		. . . with provision for storing only one subscriber number at a time, e.g. by keyboard or dial [2, 2006.01]
H04M 1/274		. . . with provision for storing more than one subscriber number at a time [2, 2006.01]
H04M 1/2745		. . . . using static electronic memories, e.g. chips [7, 2006.01, 2020.01]
H04M 1/27453		. . . . . Directories allowing storage of additional subscriber data, e.g. metadata [2020.01]
H04M 1/27457		. . . . . . Management thereof, e.g. manual editing of data [2020.01]
H04M 1/2746		. . . . . . Sorting, e.g. according to history or frequency of use [2020.01]
H04M 1/27467		. . . . . Methods of retrieving data [2020.01]
H04M 1/2747		. . . . . . Scrolling on a display [2020.01]
H04M 1/27475		. . . . . . using interactive graphical means or pictorial representations [2020.01]
H04M 1/2748		. . . . . . by matching character strings [2020.01]
H04M 1/27485		. . . . . Appending a prefix to or inserting a pause into a dialling sequence [2020.01]
H04M 1/2749		. . . . . Automatic dialling or redialling systems, e.g. on off-hook or redial on busy [2020.01]
H04M 1/27495		. . . . . implemented by means of discrete electronic components, i.e. neither programmable nor microprocessor-controlled (H04M 1/27457-H04M 1/2749 take precedence) [2020.01]
H04M 1/275		. . . . . implemented by means of portable electronic directories [7, 2006.01]
H04M 1/2753		. . . . . providing data content [2020.01]
H04M 1/2755		. . . . . . by optical scanning [7, 2006.01]
H04M 1/2757		. . . . . . by data transmission, e.g. downloading [2020.01]
H04M 1/276		. . . . using magnetic recording, e.g. on tape [2, 2006.01]
H04M 1/278		. . . . using punched cards or tapes [2, 2006.01]
H04M 1/30		. . Devices which can set up and transmit only one digit at a time [1, 2006.01]
H04M 1/31		. . . by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses [2, 2006.01]
H04M 1/315		. . . . Clutches; Spring assemblies; Speed regulators, e.g. centrifugal brakes (H04M 1/32-H04M 1/40 take precedence) [3, 2006.01]
H04M 1/32		. . . . Locking setting devices during transmission to prevent interference by user [1, 2006.01]
H04M 1/34		. . . . Lost-motion or other arrangements for ensuring a pause between successive digit transmissions [1, 2006.01]
H04M 1/38		. . . . Pulses transmitted by a movement variably limited by the setting of a stop [1, 2006.01]
H04M 1/40		. . . . wherein the setting-operation short-circuits or open-circuits the transmitting mechanism during a variable part of a cycle [1, 2006.01]
H04M 1/50		. . . by generating or selecting currents of predetermined frequencies or combinations of frequencies [1, 2, 2006.01]
H04M 1/515		. . by generating or selecting signals other than trains of pulses of similar shape, or signals other than currents of one or more different frequencies, e.g. generation of dc signals of alternating polarity, coded pulses or impedance dialling [2, 2006.01]
H04M 1/52		. . Arrangements wherein a dial or the like is mechanically coupled to a line selector [1, 2006.01]
H04M 1/53		. . Generation of additional signals, e.g. additional pulses [2, 2006.01]
H04M 1/54		. . . Arrangements wherein a dial or the like generates identifying signals, e.g. in party-line systems [1, 2, 2006.01]
H04M 1/56		. Arrangements for indicating or recording the called number at the calling subscriber's set [1, 2006.01]
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 H04M 5/20) [2, 2006.01]
H04M 1/58		. Anti-side-tone circuits [1, 2006.01]
H04M 1/60		. including speech amplifiers [1, 2006.01]
H04M 1/62		. . Constructional arrangements [1, 2006.01]
H04M 1/64		. Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations (centralised dictation systems H04M 11/10) [1, 7, 2006.01]
H04M 1/65		. . Recording arrangements [2, 7, 2006.01]
H04M 1/652		. . . Means for playing back the recorded messages by remote control over a telephone line (H04M 1/658 takes precedence) [7, 2006.01]
H04M 1/654		. . . Telephone line monitoring circuits therefor, e.g. ring detectors [7, 2006.01]
H04M 1/656		. . . for recording conversations [7, 2006.01]
H04M 1/658		. . . Means for redirecting recorded messages to other extensions or equipment [7, 2006.01]
H04M 1/66		. with means for preventing unauthorised or fraudulent calling (verifying user identity or authority in secret or secure digital communications H04L 9/32) [1, 7, 2006.01]
H04M 1/663		. . Preventing unauthorised calls to a telephone set [7, 2006.01]
H04M 1/665		. . . by checking the validity of a code [7, 2006.01]
H04M 1/667		. . Preventing unauthorised calls from a telephone set (H04M 1/677 takes precedence) [7, 2006.01]
H04M 1/67		. . . by electronic means [7, 2006.01]
H04M 1/673		. . . . the user being required to key in a code [7, 2006.01]
H04M 1/675		. . . . the user being required to insert a coded card, e.g. a smart card carrying an integrated circuit chip [7, 2006.01]
H04M 1/677		. . Preventing the dialling or sending of predetermined telephone numbers or selected types of telephone numbers, e.g. long distance numbers [7, 2006.01]
H04M 1/68		. Circuit arrangements for preventing eavesdropping [1, 2006.01]
H04M 1/70		. . Lock-out or secrecy arrangements in party-line systems [1, 2006.01]
H04M 1/71		. Substation extension arrangements [2021.01]
H04M 1/715		. . using two or more extensions per line (cordless telephones H04M 1/725) [2021.01]
H04M 1/72		. Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection [1, 7, 2006.01, 2021.01]
H04M 1/724		. . User interfaces specially adapted for cordless or mobile telephones [2021.01]
H04M 1/72403		. . . with means for local support of applications that increase the functionality [2021.01]
H04M 1/72406		. . . . by software upgrading or downloading [2021.01]
H04M 1/72409		. . . . by interfacing with external accessories (hands-free H04M 1/60) [2021.01]
H04M 1/72412		. . . . . using two-way short-range wireless interfaces [2021.01]
H04M 1/72415		. . . . . for remote control of appliances [2021.01]
H04M 1/72418		. . . . for supporting emergency services [2021.01]
H04M 1/72421		. . . . . with automatic activation of emergency service functions, e.g. upon sensing an alarm [2021.01]
H04M 1/72424		. . . . . with manual activation of emergency-service functions [2021.01]
H04M 1/72427		. . . . for supporting games or graphical animations [2021.01]
H04M 1/7243		. . . . with interactive means for internal management of messages [2021.01]
H04M 1/72433		. . . . . for voice messaging, e.g. dictaphones (for answering incoming calls H04M 1/64) [2021.01]
H04M 1/72436		. . . . . for text messaging, e.g. short messaging services [SMS] or e-mails [2021.01]
H04M 1/72439		. . . . . for image or video messaging [2021.01]
H04M 1/72442		. . . . for playing music files [2021.01]
H04M 1/72445		. . . . for supporting Internet browser applications [2021.01]
H04M 1/72448		. . . with means for adapting the functionality of the device according to specific conditions [2021.01]
H04M 1/72451		. . . . according to schedules, e.g. using calendar applications [2021.01]
H04M 1/72454		. . . . according to context-related or environment-related conditions [2021.01]
H04M 1/72457		. . . . according to geographic location [2021.01]
H04M 1/7246		. . . . by connection of exchangeable housing parts [2021.01]
H04M 1/72463		. . . . to restrict the functionality of the device [2021.01]
H04M 1/72466		. . . with selection means, e.g. keys, having functions defined by the mode or the status of the device [2021.01]
H04M 1/72469		. . . for operating the device by selecting functions from two or more displayed items, e.g. menus or icons [2021.01]
H04M 1/72472		. . . . wherein the items are sorted according to specific criteria, e.g. frequency of use [2021.01]
H04M 1/72475		. . . specially adapted for disabled users [2021.01]
H04M 1/72478		. . . . for hearing-impaired users [2021.01]
H04M 1/72481		. . . . for visually impaired users [2021.01]
H04M 1/72484		. . . wherein functions are triggered by incoming communication events [2021.01]
H04M 1/725		. . Cordless telephones (user interfaces specially adapted therefor H04M 1/724) [7, 2006.01, 2021.01]
H04M 1/72502		. . . with one base station connected to a single line [2021.01]
H04M 1/72505		. . . . Radio link set-up procedures [2021.01]
H04M 1/72508		. . . . . using a control channel [2021.01]
H04M 1/72511		. . . . . Searching for available channels [2021.01]
H04M 1/72513		. . . . . On-hold, intercom or transfer communication modes [2021.01]
H04M 1/72516		. . . . with means for out-of-range alerting [2021.01]
H04M 1/727		. . . Identification code transfer arrangements [7, 2006.01]
H04M 1/73		. . . Battery saving arrangements [7, 2006.01]
H04M 1/733		. . . with a plurality of base stations connected to a plurality of lines [7, 2006.01]
H04M 1/737		. . . characterised by transmission of electromagnetic waves other than radio waves, e.g. infrared waves [7, 2006.01]
H04M 1/738		. Interface circuits for coupling substations to external telephone lines (H04M 1/78 takes precedence) [7, 2006.01]
H04M 1/74		. . with means for reducing interference; with means for reducing effects due to line faults [1, 2006.01]
H04M 1/76		. . Compensating for differences in line impedance [1, 2006.01]
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 [2, 2006.01]
H04M 1/80		. Telephone line holding circuits [7, 2006.01]
H04M 1/82		. Line monitoring circuits for call progress or status discrimination [7, 2006.01]
H04M 3/00		Automatic or semi-automatic exchanges [1, 2006.01, 2024.01]
H04M 5/00		Manual exchanges (substation equipment in general H04M 1/00) [1, 2006.01]
H04M 7/00		Arrangements for interconnection between switching centres [1, 2006.01]
H04M 9/00		Arrangements for interconnection not involving centralised switching [1, 2006.01]
H04M 11/00		Telephonic communication systems specially adapted for combination with other electrical systems [1, 2006.01]
H04M 13/00		Party-line systems (substation equipment H04M 1/00; exchange equipment H04M 3/00, H04M 5/00; metering arrangements H04M 15/36) [1, 2006.01]
H04M 15/00		Arrangements for metering, time-control or time-indication [1, 2006.01, 2024.01]
H04M 17/00		Prepayment telephone systems (using a coded card to authorise calls from a telephone set H04M 1/675) [1, 7, 2006.01, 2024.01]
H04M 19/00		Current supply arrangements for telephone systems (for selecting equipment H04Q 1/28) [1, 2006.01]
H04M 99/00		Subject matter not provided for in other groups of this subclass [2006.01]
H04N		PICTORIAL COMMUNICATION, e.g. TELEVISION [4]
H04Q		SELECTING (switches, relays, selectors H01H; wireless communication networks H04W) [1, 2009.01]
H04R		LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K) [6]
H04S		STEREOPHONIC SYSTEMS [3]
H04W		WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M 1/72) [2009.01]
H05		ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
H10		SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR [2023.01]
H99		SUBJECT MATTER NOT OTHERWISE PROVIDED FOR IN THIS SECTION [2006.01]

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