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ITU-T E.164 Suppl. 2 (06/2020)

Number portability

Supplement 2 to Recommendation ITU-T E.164 defines standard terminology for a common
understanding of the different aspects of number portability within an ITU-T E.164 numbering
scheme. It identifies numbering and addressing formats, call flows, network architectures and routing
approaches that will provide alternative methods of implementation. It also proposes some examples
of the administrative and operational processes required for the successful implementation of number
portability.

Citation:	http://handle.itu.int/11.1002/1000/14311
Approval date:	2020-06-05
Approval process:	Agreed
Status:	In force
Maintenance responsibility:	ITU-T Study Group 2
Further details:	Patent statement(s) Development history [1 related work items in progress]

Ed.	ITU-T Recommendation	Status	Summary	Table of Contents	Download
6.7	E.164 (2010) Amd. 1 (06/2011)	In force	here	-	here
6	E.164 (11/2010)	In force	here	here	here
5	E.164 (02/2005)	Superseded	here	here	here
4	E.164 (05/1997)	Superseded	here	here	here
3	E.164/I.331 (08/1991)	Superseded	-	here	here
2	E.164/I.331/Q.11 bis (11/1988)	Superseded	-	here	here
1	E.164/I.331 (10/1984)	Superseded	-	-	Not available


ITU-T Supplement	Title	Status	Summary	Table of contents	Download
E.164 Suppl. 1 (03/1998)	Alternatives for carrier selection and network identification	In force	-	here	here
E.164 Suppl. 3 (05/2004)	Operational and administrative issues associated with national implementations of the ENUM functions	In force	here	here	here
E.164 Suppl. 3 (2004) Amd. 1 (11/2009)	-	In force	here	-	here
E.164 Suppl. 4 (05/2004)	Operational and administrative issues associated with the implementation of ENUM for non-geographic country codes	In force	here	here	here
E.164 Suppl. 4 (2004) Amd. 1 (11/2009)	-	In force	here	-	here
E.164 Suppl. 5 (11/2009)	Guidance with regard to the selection of numbers for helplines for children	In force	here	here	here
E.164 Suppl. 6 (03/2012)	Guidelines for identifying and selecting globally harmonized numbers	In force	here	here	here
E.164 Suppl. 2 (06/2020)	Number portability	In force	here	here	here
E Suppl. 11 (06/2020)	Criteria for M2M/IoT-related assignments under Recommendation ITU-T E.164.1 and Recommendation ITU-T E.212 Annex A	In force	here	here	here
E-100 series Suppl. 1 (02/2019)	ITU-T E.100 series – Framework of disaster management for disaster relief system	In force	here	here	here

Title	Approved on	Download
Identify call location for emergency service	2020	here
ISDN Field Trial Guidelines	1991	here
ISDN Field Trial Guidelines	1991	here

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ITU-T Recommendations

ITU-T E.164 Suppl. 2 (06/2020)