| I.110 | 
[Withdrawn] Preamble and general structure of the I-Series Recommendations for the integrated services digital network (ISDN)
		 Deleted after its content became technically out of date
 | 
| I.111 | 
[Withdrawn] Relationship with other Recommendations relevant to ISDNs
		 Deleted after its content became technically out of date
 | 
| I.112 | Vocabulary of terms for ISDNs
		 
 | 
| I.113 | Vocabulary of terms for broadband aspects of ISDN
		 
 | 
| I.114 | Vocabulary of terms for universal personal telecommunication
		 
 | 
| I.120 | Integrated services digital networks (ISDNs)
		 
 | 
| I.121 | Broadband aspects of ISDN
		 
 | 
| I.122 | Framework for frame mode bearer services
		 
 | 
| I.130 | Method for the characterization of telecommunication services supported by an ISDN and network capabilities of an ISDN
		 
 | 
| I.140 | Attribute technique for the characterization of telecommunication services supported by an ISDN and network capabilities of an ISDN
		 
 | 
| I.141 | ISDN network charging capabilities attributes
		 
 | 
| I.150 | B-ISDN asynchronous transfer mode functional characteristics
		 
 | 
| I.200 | Guidance to the I.200-series of Recommendations
		 
 | 
| I.210 | Principles of telecommunication services supported by an ISDN and the means to describe them
		 
 | 
| I.211 | B-ISDN service aspects
		 
 | 
| I.220 | Common dynamic description of basic telecommunication services
		 
 | 
| I.221 | Common specific characteristics of services
		 
 | 
| I.230 | Definition of bearer service categories
		 
 | 
| I.231.1 | Circuit-mode bearer service categories : Circuit-mode 64 kbit/s unrestricted, 8 kHz structured bearer service
		 
 | 
| I.231.2 | Circuit-mode bearer service categories : Circuit-mode 64 kbit/s, 8 kHz structured bearer service usable for speech information transfer
		 
 | 
| I.231.3 | Circuit-mode bearer service categories : Circuit-mode 64 kbit/s, 8 kHz structured bearer service usable for 3.1 kHz audio information transfer
		 
 | 
| I.231.4 | Circuit-mode bearer service categories : Circuit-mode, alternate speech / 64 kbit/s unrestricted, 8 kHz structured bearer service
		 
 | 
| I.231.5 | Circuit-mode bearer service categories : Circuit-mode 2 x 64 kbit/s unrestricted, 8 kHz structured bearer service
		 
 | 
| I.231.6 | Circuit-mode bearer service categories : Circuit-mode 384 kbit/s unrestricted, 8 kHz structured bearer service
		 
 | 
| I.231.7 | Circuit-mode bearer service categories : Circuit-mode 1536 kbit/s unrestricted, 8 kHz structured bearer service
		 
 | 
| I.231.8 | Circuit-mode bearer service categories : Circuit-mode 1920 kbit/s unrestricted, 8 kHz structured bearer service
		 
 | 
| I.231.9 | Circuit-mode bearer service categories : Circuit-mode 64 kbit/s 8 kHz structured multi-use bearer service
		 
 | 
| I.231.10 | Circuit-mode bearer service categories : Circuit-mode multiple-rate unrestricted 8 kHz structured bearer service
		 
 | 
| I.232.1 | Packet-mode bearer services categories : Virtual call and permanent virtual circuit bearer service category
		 
 | 
| I.232.2 | Packet-mode bearer services categories : Connectionless bearer service category
		 Empty Recommendation
This service has only been identified and requires further study
 | 
| I.232.3 | Packet-mode bearer services categories : User signalling bearer service category (USBS)
		 
 | 
| I.233.1 | ISDN frame relaying bearer service
		 
 | 
| I.233.2 | ISDN frame switching bearer service
		 
 | 
| I.240 | Definition of teleservices
		 
 | 
| I.241.1 | Teleservices supported by an ISDN : Telephony
		 
 | 
| I.241.2 | Teleservices supported by an ISDN : Teletex
		 
 | 
| I.241.3 | Teleservices supported by an ISDN : Telefax 4
		 
 | 
| I.241.4 | Teleservices supported by an ISDN : Mixed mode
		 
 | 
| I.241.5 | Teleservices supported by an ISDN : Videotex
		 
 | 
| I.241.6 | Teleservices supported by an ISDN : Telex
		 
 | 
| I.241.7 | Teleservices supported by an ISDN : Telephony 7 kHz teleservice
		 
 | 
| I.241.8 | Teleservices supported by an ISDN : Teleaction stage one service description
		 
 | 
| I.250 | Definition of supplementary services
		 
 | 
| I.251.1 | Number identification supplementary services : Direct-dialling-In
		 
 | 
| I.251.2 | Number identification supplementary services : Multiple Subscriber Number
		 
 | 
| I.251.3 | Number identification supplementary services : Calling Line Identification Presentation
		 
 | 
| I.251.4 | Number identification supplementary services : Calling Line Identification Restriction
		 
 | 
| I.251.5 | Number identification supplementary services : Connected Line Identification Presentation (COLP)
		 
 | 
| I.251.6 | Number identification supplementary services : Connected Line Identification Restriction (COLR)
		 
 | 
| I.251.7 | Number identification supplementary services : Malicious call Identification
		 
 | 
| I.251.8 | Number identification supplementary services : Sub-addressing supplementary service
		 
 | 
| I.251.9 | Number identification supplementary services : Calling name identification presentation
		 
 | 
| I.251.10 | Number identification supplementary services : Calling name identification restriction
		 
 | 
| I.252.1 | Call offering supplementary services : Call Transfer
		 
 | 
| I.252.2 | Call offering supplementary services : Call Forwarding Busy
		 
 | 
| I.252.3 | Call offering supplementary services : Call Forwarding No Reply
		 
 | 
| I.252.4 | Call offering supplementary services : Call Forwarding Unconditional
		 
 | 
| I.252.5 | Call offering supplementary services : Call Deflection
		 
 | 
| I.252.6 | Call offering supplementary services : Line Hunting (LH)
		 
 | 
| I.252.7 | Call offering supplementary services : Explicit call transfer
		 
 | 
| I.253.1 | Call completion supplementary services : Call waiting (CW) supplementary service
		 
 | 
| I.253.2 | Call completion supplementary services : Call Hold
		 
 | 
| I.253.3 | Call completion supplementary services : Completion of calls to busy subscribers
		 
 | 
| I.253.4 | Call completion supplementary services : Completion of calls on no reply
		 
 | 
| I.254.1 | Multiparty supplementary services : Conference calling (CONF)
		 
 | 
| I.254.2 | Multiparty supplementary services : Three-Party Supplementary Service
		 
 | 
| I.254.5 | Multiparty supplementary services : Meet-me conference
		 
 | 
| I.255.1 | Community of interest supplementary services : Closed User Group
		 
 | 
| I.255.2 | Community of interest supplementary services : Support of Private Numbering Plans
		 
 | 
| I.255.3 | Community of interest supplementary services : Multi-level precedence and preemption service (MLPP)
		 
 | 
| I.255.4 | Community of interest supplementary services : Priority service
		 
 | 
| I.255.5 | Community of interest supplementary services : Outgoing call barring
		 
 | 
| I.256.1 | Charging supplementary services : Credit card calling (CRED)
		 Empty Recommendation. This subject has only been identified and is left for further study.
 | 
| I.256.2a | Charging supplementary services : Advice of charge: charging information at call set-up time (AOC-S)
		 
 | 
| I.256.2b | Charging supplementary services : Advice of charge: charging information during the call (AOC-D)
		 
 | 
| I.256.2c | Charging supplementary services : Advice of charge: charging information at the end of the call (AOC-E)
		 
 | 
| I.256.3 | Charging supplementary services : Reverse charging
		 
 | 
| I.257.1 | Additional information transfer supplementary services : User-to-User Signalling (UUS)
		 
 | 
| I.258.1 | Mobility and modification supplementary services : Terminal portability (TP)
		 
 | 
| I.258.2 | Mobility and modification supplementary services : In-call modification (IM)
		 
 | 
| I.259.1 | Screening supplementary services : Address screening (ADS)
		 
 | 
| I.310 | ISDN - Network functional principles
		 
 | 
| I.311 | B-ISDN general network aspects
		 
 | 
| I.312 | Principles of intelligent network architecture
		 This Recommendation is published with the double number Q.1201 and I.312
 | 
| I.313 | B-ISDN network requirements
		 
 | 
| I.320 | ISDN protocol reference model
		 
 | 
| I.321 | B-ISDN protocol reference model and its application
		 Covering note, May 2000: Erratum
 | 
| I.322 | Generic protocol reference model for telecommunication networks
		 
 | 
| I.324 | ISDN network architecture
		 
 | 
| I.325 | Reference configurations for ISDN connection types
		 
 | 
| I.326 | Functional architecture of transport networks based on ATM
		 
 | 
| I.327 | B-ISDN functional architecture
		 
 | 
| I.328 | Intelligent network - Service plane architecture
		 This Recommendation is published with the double number Q.1202 and I.328
 | 
| I.329 | Intelligent network - Global functional plane architecture
		 This Recommendation is published with the double number Q.1203 and I.329. For more details see I.329
 | 
| I.330 | ISDN numbering and addressing principles
		 
 | 
| I.331 | The international public telecommunication numbering plan
		 This Recommendation is published under alias number E.164
 | 
| I.332 | 
[Withdrawn] Numbering principles for interworking between ISDNs and dedicated networks with different numbering plans
		 
 | 
| I.333 | Terminal selection in ISDN
		 
 | 
| I.334 | Principles relating ISDN numbers/sub-addresses to the OSI reference model network layer addresses
		 
 | 
| I.335 | 
[Withdrawn] ISDN routing principles
		 Superseded by ITU-T E.172 (1992)
 | 
| I.340 | ISDN connection types
		 
 | 
| I.350 | General aspects of quality of service and network performance in digital networks, including ISDNs
		 
 | 
| I.351 | Relationships among ISDN, Internet protocol, and GII performance Recommendations
		 
 | 
| I.352 | Network performance objectives for connection processing delays in an ISDN
		 
 | 
| I.353 | Reference events for defining ISDN and B-ISDN performance parameters
		 
 | 
| I.354 | Network performance objectives for packet-mode communication in an ISDN
		 
 | 
| I.355 | ISDN 64 kbit/s connection type availability performance
		 
 | 
| I.356 | B-ISDN ATM layer cell transfer performance
		 
 | 
| I.357 | B-ISDN semi-permanent connection availability
		 
 | 
| I.358 | Call processing performance for switched virtual channel connections (VCCs) in a B-ISDN
		 
 | 
| I.359 | Accuracy and dependability of ISDN 64 kbit/s circuit-mode connection types
		 
 | 
| I.361 | B-ISDN ATM layer specification
		 
 | 
| I.362 | 
[Withdrawn] B-ISDN ATM adaptation layer (AAL) functional description
		 Deleted, since the service classes defined therein were no longer appropriate and were in conflict with F-Series Recommendations
 | 
| I.363 | 
[Withdrawn] B-ISDN ATM adaptation layer (AAL) specification
		 This Recommendation was subdivided into ITU-T Recs. I.363.1 to I.363.5 when revised in 1996
 | 
| I.363.1 | B-ISDN ATM Adaptation Layer specification : Type 1 AAL
		 
 | 
| I.363.2 | B-ISDN ATM Adaptation Layer specification : Type 2 AAL
		 
 | 
| I.363.3 | B-ISDN ATM Adaptation Layer specification : Type 3/4 AAL
		 
 | 
| I.363.5 | B-ISDN ATM Adaptation Layer specification : Type 5 AAL
		 
 | 
| I.364 | Support of the broadband connectionless data bearer service by the B-ISDN
		 
 | 
| I.365.1 | B-ISDN ATM adaptation layer sublayers : Frame relaying service specific convergence sublayer (FR-SSCS)
		 
 | 
| I.365.2 | B-ISDN ATM adaptation layer sublayers : Service-specific coordination function to provide the connection-oriented network service
		 
 | 
| I.365.3 | B-ISDN ATM adaptation layer sublayers : Service-specific coordination function to provide the connection-oriented transport service
		 
 | 
| I.365.4 | B-ISDN ATM adaptation layer sublayers : Service-specific convergence sublayer for HDLC applications
		 
 | 
| I.366.1 | Segmentation and Reassembly Service Specific Convergence Sublayer for the AAL type 2
		 
 | 
| I.366.2 | AAL type 2 service specific convergence sublayer for narrow-band services
		 
 | 
| I.370 | Congestion management for the ISDN frame relaying bearer service
		 
 | 
| I.371 | Traffic control and congestion control in B-ISDN
		 
 | 
| I.371.1 | 
[Withdrawn] Guaranteed frame rate ATM transfer capability
		 
 | 
| I.372 | Frame relaying bearer service network-to-network interface requirements
		 
 | 
| I.373 | 
[Withdrawn] Network capabilities to support universal personal telecommunication (UPT)
		 Deleted in 2022 as a consequence of the suppression of the Universal Personal Telecommunication (UPT) service
 | 
| I.374 | 
[Withdrawn] Framework Recommendation on "network capabilities to support multimedia services"
		 Replaced by ITU-T I.375.1 and ITU-T I.375.2
 | 
| I.375.1 | Network capabilities to support multimedia services : General aspects
		 
 | 
| I.375.2 | Network capabilities to support multimedia services : Example of multimedia retrieval service class - Video-on-demand service using an ATM-based network
		 
 | 
| I.375.3 | Network capabilities to support multimedia services : Example of multimedia distribution service class - Switched digital broadcasting
		 
 | 
| I.376 | ISDN network capabilities for the support of the teleaction service
		 
 | 
| I.377 | Network requirements to support charging and accounting in B-ISDN
		 
 | 
| I.378 | Traffic control and congestion control at the ATM Adaptation Layer type 2
		 
 | 
| I.380 | Internet protocol data communication service - IP packet transfer and availability performance parameters
		 This Recommendation was first approved and published as I.380, and then renumbered as Y.1540 on 2000-03-10 without further modification
 | 
| I.381 | ATM adaptation layer (AAL) Performance
		 
 | 
| I.410 | General aspects and principles relating to Recommendations on ISDN user-network interfaces
		 
 | 
| I.411 | ISDN user-network interfaces - Reference configurations
		 
 | 
| I.412 | ISDN user-network interfaces - Interface structures and access capabilities
		 
 | 
| I.413 | B-ISDN user-network interface
		 
 | 
| I.414 | Overview of Recommendations on layer 1 for ISDN and B-ISDN customer accesses
		 
 | 
| I.420 | Basic user-network interface
		 
 | 
| I.421 | Primary rate user-network interface
		 
 | 
| I.430 | Basic user-network interface - Layer 1 specification
		 
 | 
| I.431 | Primary rate user-network interface - Layer 1 specification
		 
 | 
| I.432 | 
[Withdrawn] B-ISDN user-network interface - Physical layer specification
		 
 | 
| I.432.1 | B-ISDN user-network interface - Physical layer specification : General characteristics
		 
 | 
| I.432.2 | B-ISDN user-network interface - Physical layer specification : 155 520 kbit/s and 622 080 kbit/s operation
		 
 | 
| I.432.3 | B-ISDN user-network interface - Physical layer specification : 1544 kbit/s and 2048 kbit/s operation
		 
 | 
| I.432.4 | B-ISDN user-network interface - Physical layer specification : 51 840 kbit/s operation
		 
 | 
| I.432.5 | B-ISDN user-network interface - Physical layer specification : 25 600 kbit/s operation
		 
 | 
| I.460 | Multiplexing, rate adaption and support of existing interfaces
		 
 | 
| I.464 | Multiplexing, rate adaption and support of existing interfaces for restricted 64 kbit/s transfer capability
		 
 | 
| I.470 | Relationship of terminal functions to ISDN
		 
 | 
| I.480 | 1+1 protection switching for cell-based physical layer
		 
 | 
| I.500 | General structure of the ISDN interworking Recommendations
		 
 | 
| I.501 | Service interworking
		 
 | 
| I.510 | Definitions and general principles for ISDN interworking
		 
 | 
| I.511 | ISDN-to-ISDN layer 1 internetwork interface
		 
 | 
| I.515 | Parameter exchange for ISDN interworking
		 
 | 
| I.520 | General arrangements for network interworking between ISDNs
		 
 | 
| I.525 | Interworking between networks operating at bit rates less than 64 kbit/s with 64 kbit/s-based ISDN and B-ISDN
		 
 | 
| I.530 | Network interworking between an ISDN and a public switched telephone network (PSTN)
		 
 | 
| I.555 | Frame Relaying Bearer Service interworking
		 
 | 
| I.570 | Public/private ISDN interworking
		 
 | 
| I.571 | Connection of VSAT based private networks to the public ISDN
		 
 | 
| I.572 | VSAT interconnection with the PSTN
		 
 | 
| I.580 | General arrangements for interworking between B-ISDN and 64 kbit/s based ISDN
		 
 | 
| I.581 | General arrangements for B-ISDN interworking
		 
 | 
| I.601 | General maintenance principles of ISDN subscriber access and subscriber installation
		 
 | 
| I.602 | Application of maintenance principles to ISDN subscriber installations
		 Renumbered M.3602 when revised in 1992
 | 
| I.603 | Application of maintenance principles to ISDN basic accesses
		 Renumbered M.3603 when revised in 1992
 | 
| I.604 | Application of maintenance principles to ISDN primary rate accesses
		 Renumbered M.3604 when revised in 1992
 | 
| I.605 | Application of maintenance principles to static multiplexed ISDN basic accesses
		 Renumbered M.3605 when revised in 1992
 | 
| I.610 | B-ISDN operation and maintenance principles and functions
		 
 | 
| I.620 | 
[Withdrawn] Frame relay operation and maintenance principles and functions
		 This Recommendation was deleted on 2004-06-08, the technical area being now covered by ITU-T Rec. X.151 (2003)
 | 
| I.630 | ATM protection switching
		 
 | 
| I.731 | Types and general characteristics of ATM equipment
		 
 | 
| I.732 | Functional characteristics of ATM equipment
		 
 | 
| I.733 | Voice on ATM circuit multiplication equipment
		 
 | 
| I.741 | Interworking and interconnection between ATM and switched telephone networks for the transmission of speech, voiceband data and audio signals
		 
 | 
| I.751 | Asynchronous transfer mode management of the network element view
		 
 | 
| I.Imp751 | Implementor's Guide for Recommendation I.751
		 
 | 
| I.761 | Inverse multiplexing for ATM (IMA)
		 
 | 
| I.762 | ATM over fractional physical links
		 
 | 
| I.Sup1 | Generic service descriptions for ten supplementary services defined in I.250-Series Recommendations
		 
 |