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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : E.164
Title : Numbering plan for the ISDN era
Study Group : II - Network Operation
Version : Revised
Date of adoption : 1991
Notes : Identical with I.331
The rapid advances in telecommunications technology coupled with
increased diversification of customer demands served by a number of
different types of dedicated public switched networks (telephone,
telex, data, etc.) have created a need to provide a uniform customer
access and network structure. Such a structure is called the
integrated services digital network (ISDN). Implementation of ISDNs
has begun in a number of countries and eventually these will carry the
full range of existing and new services.
To provide a broad base for the growth of ISDN arrangements, numbering
has been kept compatible with that originally established for the
international telephone service. As recounted in Recommendation E.164,
numbering for the international telephone service is a subset of the
numbering plan for the ISDN era. The timetable for implementation of
new provisions introduced primarily to support the ISDN era is
described in Recommendation E.165.
To order the complete text of this Recommendation, please use the
Order Form for ITU-T Recommendations. An electronic version of this
form is available on ITUDOC (Winword: UPI=ITU-5265; ASCII: UPI=ITU-2488).