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ITU-T Q.931 (05/1998)

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

This Recommendation specifies the procedures for the establishing, maintaining and clearing of network connections at the ISDN user-network interface. These procedures are defined in terms of messages exchanged over the D-channel of basic and primary rate interface structures. The functions and procedures of this protocol, and the relationship with other layers, are described in general terms in Recommendation Q.930/I.450 [1]. Annex M contains the additional basic call signalling requirement for the support of private network interconnection for VPN applications.

Citation:	https://handle.itu.int/11.1002/1000/4378
Series title:	I series: Integrated services digital network I.400-I.499: ISDN user-network interfaces I.450-I.459: Layer 3 Recommendations Q series: Switching and signalling, and associated measurements and tests Q.850-Q.999: Digital subscriber Signalling System No. 1 Q.930-Q.939: Network layer
Approval date:	1998-05-15
Approval process:	TAP
Status:	In force
Observation:	This Recommendation is also included but not published in I series under alias number I.451
Maintenance responsibility:	ITU-T Study Group 11
Further details:	Patent statement(s)

Ed.	ITU-T Recommendation	Status	Summary	Table of Contents	Download
4.2	Q.931 (1998) Amd. 2 (12/2023)	In force	here	here	here
4.1	Q.931 (1998) Amd. 1 (12/2002)	In force	here	here	here
4.0	Q.931 (1998) Err. 1 (02/2003)	In force	-	-	here
4	Q.931 (05/1998)	In force	here	here	here
3	Q.931 (03/1993)	Superseded	-	-	here
2	I.451/Q.931 (11/1988)	Superseded	-	here	here
1	I.451/Q.931 (10/1984)	Superseded	-	-	Not available


ITU-T Supplement	Title	Status	Summary	Table of contents	Download
Q Suppl. 1 (10/1995)	Signalling System No.7 testing and planning tools	In force	-	here	here
Q Suppl. 2 (09/1997)	Intelligent network user's guide: Supplement for IN CS-1	In force	here	here	here
Q Suppl. 3 (05/1998)	Number portability – Scope and capability set 1 architecture	In force	here	here	here
Q Suppl. 4 (05/1998)	Number portability – Capability set 1 requirements for service provider portability (All call query and Onward routing)	In force	here	here	here
Q Suppl. 5 (03/1999)	Number portability – Capability set 2 requirements for service provider portabilty (Query on release and Dropback)	In force	here	here	here
Q Suppl. 7 (03/1999)	Technical Report TRQ.2001: General aspects for the development of unified signalling requirements	In force	here	here	here
Q Suppl. 8 (03/1999)	Technical Report TRQ.2400: Transport control signalling requirements – Signalling requirements for AAL Type 2 link control capability set 1	In force	here	here	here
Q Suppl. 9 (03/2004)	Technical Report TRQ.2000: Roadmap for the TRQ.2xxx-series Technical Reports	In force	here	here	here
Q Suppl. 10 (12/1999)	Technical Report TRQ.2002: Information flow elements	In force	here	here	here
Q Suppl. 11 (12/1999)	Technical Report TRQ.2010: B-ISDN signalling interworking requirements	In force	here	here	here
Q Suppl. 12 (12/1999)	Technical Report TRQ.2100: Coordinated call control and bearer control signalling requirements – Root-party coordinated call and bearer control	In force	here	here	here
Q Suppl. 13 (12/1999)	Technical Report TRQ.2110: Coordinated call control and bearer control signalling requirements – Leaf-party coordinated call and bearer control	In force	here	here	here
Q Suppl. 14 (12/1999)	Technical Report TRQ.2120: Coordinated call control and bearer control signalling requirements – Third-party coordinated call and bearer control	In force	here	here	here
Q Suppl. 15 (12/1999)	Technical Report TRQ.2130: Coordinated call control and bearer control signalling requirements for leaf initiated join service	In force	here	here	here
Q Suppl. 16 (12/1999)	Technical Report TRQ.2140: Signalling requirements for the support of narrowband services via broadband transport technologies	In force	here	here	here
Q Suppl. 17 (12/1999)	Technical Report TRQ.2200: Call control signalling requirements – Party call control	In force	here	here	here
Q Suppl. 18 (12/1999)	Technical Report TRQ.2230: Call control signalling requirements – Join call service	In force	here	here	here
Q Suppl. 19 (12/1999)	Technical Report TRQ.2300: Bearer control signalling requirements – Root-party bearer control	In force	here	here	here
Q Suppl. 20 (12/1999)	Technical Report TRQ.2310: Bearer control signalling requirements – Leaf-party bearer control	In force	here	here	here
Q Suppl. 21 (12/1999)	Technical Report TRQ.2320: Bearer control signalling requirements – Third-party bearer control	In force	here	here	here
Q Suppl. 22 (12/1999)	Technical Report TRQ.3000: Operation of the bearer independant call control (BICC) protocol with digital subscriber signalling system No. 2 (DSS2)	In force	here	here	here
Q Suppl. 24 (12/1999)	Technical Report TRQ.3020: Operation of the bearer independant call control (BICC) protocol with broadband integrated services digital network user part (B-ISUP) for AAL Type 1 adaptation	In force	here	here	here
Q Suppl. 26 (12/1999)	Broadband integrated services digital network (B-ISDN) – Digital subscriber signalling system No. 2 (DSS2) and signalling system No. 7 (B-ISUP) – Support of services over IP-based networks	In force	here	here	here
Q Suppl. 27 (12/1999)	Technical Report – Overview of Signalling and Protocol Framework for an Emerging Environment (SPFEE)	In force	here	here	here
Q Suppl. 28 (12/1999)	Technical Report: Signalling and protocol framework for an emerging environment (SPFEE) – Specifications for service access	In force	here	here	here
Q Suppl. 29 (12/1999)	Service Modelling: Evolution to the use of object oriented techniques	In force	here	here	here
Q Suppl. 31 (12/2000)	Technical Report TRQ.2141.0: Signalling requirements for the support of narrow-band services over broadband transport technologies – Capability set 2 (CS-2)	In force	here	here	here
Q Suppl. 32 (11/2002)	Technical Report TRQ.2141.1: Signalling requirements for the support of narrowband services via broadband transport technologies – CS-2 signalling flows	In force	here	here	here
Q Suppl. 33 (12/2000)	Technical Report TRQ.2401: Transport control signalling requirements – Signalling requirements for AAL type 2 link control capability set 2	In force	here	here	here
Q Suppl. 34 (12/2000)	Technical Report TRQ.2410: Signalling Requirements Capability Set 1 for the support of IP Bearer Control in BICC networks	In force	here	here	here
Q Suppl. 35 (12/2000)	Technical Report TRQ.2500: Signalling Requirements for the support of the call bearer control interface (CS-1)	In force	here	here	here
Q Suppl. 36 (12/2000)	Technical Report TRQ.3030: Operation of the bearer independent call control (BICC) protocol (CS-2) with IP bearer control protocol (IPBCP)	In force	here	here	here
Q Suppl. 37 (07/2006)	DSS1 and DSS2 messages and information element identifiers	In force	here	here	here
Q Suppl. 38 (05/2001)	Technical Report TRQ.2600: BICC signalling transport requirements – Capability set 1	In force	here	here	here
Q Suppl. 39 (03/2002)	Technical Report TRQ.2700: Requirements for signalling in access networks that support BICC	In force	here	here	here
Q Suppl. 40 (11/2002)	Technical Report: Reference document on API/object interface between network control and application layer	In force	here	here	here
Q Suppl. 41 (11/2002)	Technical Report TRQ.2003: Roadmap to the BICC protocol Recommendations, BICC interworking Recommendations, and BICC requirement Supplements	In force	here	here	here
Q Suppl. 42 (09/2003)	Technical Report TRQ.2402: Transport control signalling requirements – Signalling requirements for AAL type 2 link control Capability Set 3	In force	here	here	here
Q Suppl. 43 (09/2003)	Technical Report TRQ.2415: Transport control signalling requirements – Signalling requirements for IP connection control in radio access networks Capability Set 1	In force	here	here	here
Q Suppl. 44 (09/2003)	Technical Report TRQ.2800: Transport control signalling requirements – Signalling requirements for AAL type 2 to IP interworking Capability Set 1	In force	here	here	here
Q Suppl. 45 (09/2003)	Technical Report TRQ.2815: Requirements for interworking BICC/ISUP network with originating/destination networks based on Session Initiation Protocol and Session Description Protocol	In force	here	here	here
Q Suppl. 46 (09/2003)	Technical Report TRQ.2830: ATM-MPLS network interworking signalling requirements	In force	here	here	here
Q Suppl. 47 (11/2003)	Emergency services for IMT-2000 networks – Requirements for harmonization and convergence	In force	here	here	here
Q Suppl. 48 (03/2004)	Guideline document for specifying API/object interface between network control and application layer	In force	here	here	here
Q Suppl. 49 (02/2014)	Signalling requirements to support IP telephony	In force	here	here	here
Q Suppl. 50 (03/2004)	Technical Report TRQ.2145: Requirements for a Narrow-band Signalling Syntax (NSS)	In force	here	here	here
Q Suppl. 51 (12/2004)	Signalling requirements for IP-QoS	In force	here	here	here
Q Suppl. 52 (12/2004)	NNI mobility management requirements for systems beyond IMT-2000	In force	here	here	here
Q Suppl. 53 (09/2005)	Signalling requirements to support the International Emergency Preference Scheme (IEPS)	In force	here	here	here
Q Suppl. 54 (04/2007)	Signalling requirements at the interface between SUP-FE and I/S-CSC-FE	In force	here	here	here
Q Suppl. 55 (04/2007)	Signalling requirements at the interface between AS-FE and S-CSC-FE	In force	here	here	here
Q Suppl. 56 (04/2007)	Organization of NGN service user data	In force	here	here	here
Q Suppl. 57 (01/2008)	Signalling requirements to support the emergency telecommunications service (ETS) in IP networks	In force	here	here	here
Q Suppl. 58 (01/2008)	Organization of NGN transport user data	In force	here	here	here
Q Suppl. 59 (01/2008)	Signalling flows and parameter mapping for resource control	In force	here	here	here
Q Suppl. 61 (04/2010)	Evaluation of signalling protocols to support ITU-T Y.2171 admission control priority levels	In force	here	here	here
Q Suppl. 62 (02/2014)	Overview of the work of standards development organizations and other organizations on the emergency telecommunications service	In force	here	here	here
Q Suppl. 63 (06/2013)	Signalling protocol mappings in support of the Emergency Telecommunications Service in IP networks	In force	here	here	here
Q Suppl. 64 (02/2014)	Physical realization of next generation networks	In force	here	here	here
Q Suppl. 67 (04/2015)	Framework of signalling for software-defined networking	In force	here	here	here
Q Suppl. 68 (12/2015)	Technical Report on emergency telecommunication service (ETS) interoperability limitations	In force	here	here	here
Q Suppl. 69 (07/2018)	Framework for interconnection between VoLTE-based network and other networks supporting emergency telecommunications service (ETS)	In force	here	here	here
Q Suppl. 70 (06/2019)	Signalling requirements for IMS and GSM/UMTS network supporting multi-device emergency telecommunications service	In force	here	here	here
Q Suppl. 72 (07/2020)	Signalling requirements for IP multimedia subsystem (IMS) emergency telecommunications service in support of multiple accesses	In force	here	here	here
Q Suppl. 73 (03/2021)	Guidelines for permissive versus restrictive system implementations to address counterfeit, stolen and illegal mobile devices	In force	here	here	here
Q Suppl. 74 (03/2021)	Roadmap for the ITU-T Q.5050-series - Combat of counterfeit ICT and stolen mobile devices	In force	here	here	here
Q Suppl. 75 (12/2021)	Use cases on the combat of counterfeit ICT and stolen mobile devices	In force	here	here	here

Title	Approved on	Download
Implementers' Guide for Recommendation ITU-T Q.931 (05/98)	1999-03-01	here

Title	Approved on	Download
ISDN field trial guidelines	1991	here

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ITU-T Recommendations

ITU-T Q.931 (05/1998)