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ITU-T Q.931

ISDN user-network interface layer 3 specification for basic call control

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Organization: ITU-T
Publication Date: 1 May 1998
Status: active
Page Count: 345
scope:

Scope of this Recommendation

The procedures currently described in this Recommendation are for the control of circuit-switched connections, user-to-user signalling connections and packet-switched connections. The transport of other message-based information flows on the D-channel is a subject for further study and will be included in related Recommendations.

NOTE 1 - The term "layer 3" is used for the functions and protocol described in this Recommendation (see Recommendation Q.930/I.450). The terms "data link layer" and "layer 2" are used interchangeably to refer to the layer immediately below layer 3.

NOTE 2 - Alignment of the functions and protocol with those of OSI network layer is for further study.

Document History

Q.931 AMD 2
December 1, 2023
(Pre-Published) ISDN user-network interface layer 3 specification for basic call control Amendment 2 – Extensions for the support for the calling line identification authentication
The amendment was produced to meet the need for the implementation of the calling line identification authentication. This amendment contains the modifications to Recommendation ITU-T Q.931 (1999) in...
ITU-T Q.931
February 14, 2003
ISDN user-network interface layer 3 specification for basic call control
Scope of this Recommendation The procedures currently described in this Recommendation are for the control of circuit-switched connections, user-to-user signalling connections and packet-switched...
ITU-T Q.931
December 1, 2002
ISDN user-network interface layer 3 specification for basic call control SERIES Q: SWITCHING AND SIGNALLING Digital subscriber Signalling System No. 1 – Network layer
A description is not available for this item.
ITU-T Q.931
May 1, 1998
ISDN user-network interface layer 3 specification for basic call control
Scope of this Recommendation The procedures currently described in this Recommendation are for the control of circuit-switched connections, user-to-user signalling connections and packet-switched...
Q.931
January 1, 1993
Digital Subscriber Signalling System No. 1 (DSS 1) - ISDN User-Network Interface Layer 3 Specification for Basic Call Control - Digital Subscriber Signalling System No. 1 Network Layer
A description is not available for this item.
Q.931
January 1, 1989
ISDN User-Network Interface Layer 3 Specification for Basic Call Control - Digital Subscriber Signalling System No. 1 (DSS 1), Network Layer, User-Network Management
A description is not available for this item.
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References

This document references:
ITU-T H.223 - Multiplexing Protocol for Low Bit Rate Multimedia Communication Series H: Audiovisual and Multimedia Systems Infrastructure of Audiovisual Services - Transmission Multiplexing and Synchronization
Published by ITU-T on July 1, 2001
A description is not available for this item.
This document references:
ITU-T I.334 - Principles Relating ISDN Numbers/Subaddresses to the OSI Reference Model Network Layer Addresses
Published by ITU-T on November 1, 1988
Introduction Recommendation X.200, covering the open systems reference model, applies the term "address" to identify service access points at each layer. With respect to the network layer, a service...
This document references:
I.441 - ISDN User-Network Interface, Data Link Layer Specification - Integrated Services Digital Network (ISDN) - Overall Network Aspects and Functions, ISDN User-Network Interfaces (Study Group XVIII) 1 pp
Published by ITU-T on January 1, 1989
A description is not available for this item.
This document is referenced by:
TS 124 008 - Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; 5G; Mobile radio interface Layer 3 specification; Core network protocols; Stage 3
Published by ETSI on July 1, 2023
The present document specifies the procedures used at the radio interface core network protocols within the 3rd generation mobile telecommunications system and the digital cellular telecommunications...
This document is referenced by:
TS 144 018 - Digital cellular telecommunications system (Phase 2+) (GSM); Mobile radio interface layer 3 specification; GSM/EDGE Radio Resource Control (RRC) protocol
Published by ETSI on May 1, 2022
The present document specifies the procedures used at the radio interface (Reference Point Um, see 3GPP TS 24.002) for Radio Resource (RR) management. Notation "Reserved sub-clause number" is used to...
This document is referenced by:
CSA ISO/IEC 11573 - Information Technology - Telecommunications and Information Exchange between Systems - Synchronization Methods and Technical Requirements for Private Integrated Services Networks
Published by CSA on May 1, 1995
This International Standard contains requirements necessary for the synchronization of PISNs. Timing within a digital private network needs to be controlled carefully to ensure that the rate of...
This document is referenced by:
CSA ISO/IEC 18051 - Information technology - Telecommunications and information exchange between systems - Services for Computer Supported Telecommunications Applications (CSTA) Phase III
Published by CSA on January 1, 2014
This International Standard specifies the Services and Event Reports for Computer-Supported Telecommunications Applications, Phase III (CSTA). This International Standard is focused on providing...
This document is referenced by:
CAN/CSA-ISO/IEC ISP 10609-20-99 - Information Technology - International Standardized Profiles TB, TC, TD and TE - Connection-Mode Transport Service over Connection-Mode Network Service - Part 20: Overview of the Generalized Multli-Part ISP Structure for TC and TD Group Profiles for OSI Usage of ISDN
Published by CSA on January 1, 1999
General ISO/IEC ISP 10609 is applicable to end systems concerned with operating in the Open Systems Interconnection (OSI) environment. It specifies a combination of OSI standards, which collectively...
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