ITU-T E 174-1995 Routing Principles and Guidance for Universal Personal Telecommunications (UPT) - Telephone Network and ISDN - Operation Numbering Routing and Mobile Service (Stud.pdf

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1、ITU-T RECMN*E-Ii?Y 75 4862571 0602375 87T INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU TELEPHONE NETWORK AND ISDN OP E RAT1 ON, N UMBER IN G , ROUTING AND MOBILE SERVICE E.174 (04195) ROUTING PRINCIPLES AND GUIDANCE FOR UNIVERSAL PERSONAL TELECOMMUNICAT

2、IONS (UPT) ITU-T Recommendation E.174 (Previously “CCITT Recommendation”) ITU-T RECMN*E.L7V 75 48b257L Ob02376 70b FOREWORD The ITU-T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (ITU). The ITU-T is responsible for studying technical, o

3、perating and tariff questions and issuing Recommen- dations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in

4、their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1 (Helsinki, March 1-12, 1993). ITU-T Recommendation E. 174 was prepared by ITU-T Study Group 2 (1993-1996) and was approved u

5、nder the WTSC Resolution No. 1 procedure on the 21st of April 1995. NOTE In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. O ITU 1995 All rights reserved. No part of this publication

6、may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. 10 11 12 CONTENTS Introduction Keywords . . Scope References Terms and definitions . Abbreviations . UPT call types UPT InCall genera

7、l routing model . Applications of the InCall general routing model 9.1 “UPT service provider-based” routing . 9.2 Call routing using ITU-T SS No . 7 ISUP redirection capabilities 9.3 “Service profile query” procedure PT OutCail routing UPT to UPT routing . History Recommendation E.174 (04/95) Page 1

8、 1 1 2 2 3 3 3 4 4 5 5 8 8 9 1 SUMMARY This Recommendation identifies the international call routing principles and guidance in the user plane for the restricted short-term UPT service scenario, the basic UPT service scenario and the beginnings of the enhanced UPT service scenario which are applicab

9、le to UPT InCalls, UPT OutCalls and UPT to UPT calls. This Recommendation is intended to enable early implementations without providing exhaustive or restrictive lists of implementations. 11 Recommendation E.174 (04/95) - ITU-T RECMN*E-L74 95 4862593 Ob02379 4L5 , I Recommendation E.174 ROUTING PRIN

10、CIPLES AND GUIDANCE FOR UNIVERSAL PERSONAL TELECOMMUNICATIONS (UPT) (Geneva, 1995) 1 Introduction The set-up of calls from a UPT user and calls to a UPT user requires routing arrangements to be established. In fixed telecommunication networks, users are associated with the network access point of th

11、e terminai. With UPT, the fixed association between terminal and user identification is removed. The identification of UPT users is treated separately from the addressing of terminals and network access points. This Recommendation provides for information on the routing of UPT calls from terminals c

12、onnected to the PSTN and the ISDN, either fixed or mobile terminals. 2 Keywords Assisting network Called UPT User Calling UPT User UPT access code UPT access number UPT number UPT routing UFT service profile UP“ serving exchange 3 Scope This Recommendation identifies the international call routing p

13、rincipies and guidance in the user plane for near-tem and long-term implementations which are applicable to UPT InCalls, UPT OutCalls, UPT to UPT calls and UPT service profile management calls. The Recommendation will enable early implementations without providing exhaustive or restrictive lists of

14、implementations. These routing principles are not precluded for national use. Examples of specific applications are provided in this Recommendation. The exact mechanism for obtaining the routing information and its implications on security, charging, etc. are outside the scope of this Recommendation

15、. In general, the routing of UPT calls follows the routing principles in Recommendations E.170 through E.173. The service description for WT Service Set 1 may be found in Recommendation F.851. The service interactions with non-UPT services and UFT supplementary services are outside of the scope of t

16、his Recommendation. Recommendation E.174 (04/95) 1 ITU-T RECMN*E.174 95 = 48b259L Ob02380 137 4 References The following ITU-T Recommendations contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated we

17、re valid. All Recommendations are subject to revision; all users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations. A list of the currently valid ITU-T Recommendations is regularly published. - Recommendation E.

18、164, Numbering plan for the ISDN era. - Recommendation E. 168, Application of the E. 164 numbering plan for UPT. - Recommendation E. 170, Trafic routing. - Recommendation E. 17 1, International telephone routing plan. - Recommendation E. 172, ISDN routing plan. - Recommendation E. 173, Routing plan

19、for interconnection between public land mobile networks andfixed terminal networks. - Recommendation F.850, Principles of universal personal telecommunication (UPT). - Recommendation F.85 1, Universal Personal Telecommunication (UPT) - Service description (Service Set I). - Recommendation D.280, Pri

20、nciples for charging and billing, accounting and reimbursements for Universal Personal Telecommunication (UPT). - Recommendation 1.373, Network capabilities to support Universal Personal Telecommunication (UPT). - Recommendation Q.761, Functional description of the ISDN user part of Signalling Syste

21、m No. 7. - Recornmendation 4.762, Generalfunction of messages and signals of the ISDN user part of Signalling System No. 7. - Recommendation 4.763, Formats and codes of the ISDN user parr of Signalling System No. 7. - Recommendation Q.764, Signalling System No. 7 - ISDN user par? signalling procedur

22、es. 5 Terms and definitions For the purposes of this Recommendation, the following definitions apply. 5.1 assisting network: The assisting network provides UPT capabilities that allow queries to other UPT capable networks, for example to the home network of the UPT user. An assisting network can be

23、used for calls originating from a non-UPT capable network. An assisting network may also be used in calls from a UPT capable network when capabilities of the originating network are not used. An assisting network may also provide transit functions. 5.2 is registered in the UPT users service profile

24、as that users current destination choice for incoming calls. destination termina1 number (DTN): The E.164 number assigned to the network terminal or interface which 5.3 the terminal specified by the user. InCali: This is a UPT call type which permits a UPT user to have calls to that users UPT number

25、 routed to 5.4 to the UPT user based on that users UPT number. OutCaIl: This UPT call type permits a UPT user to make calls from any network terminal, which are charged 2 Recommendation E.174 (04/95) - ITU-T RECMN*E-374 95 m 4862593 Ob02383 073 m 5.5 UPT access code: An access code defined in Recomm

26、endation F.85 1. 5.6 need to dial, when using certain terminals and networks in order to contact his service profile (provider). UPT access number: An access number defined in Recommendation E.168. A number the UPT user may 5.7 UPT number: A UPT number is an Recommendation E.164 number. It is define

27、d as a number in E. 168 using the service description of Recommendation F.851. A UPT number is assigned to, and uniquely identifies, each UPT user. A UPT number is used by a caller to reach a UPT user, regardless of the current location of the UPT user. A UPT user may have more than one UPT number (

28、for example, a business UPT number for business calls and a private UPT number for private calls). 5.8 UPT service profile: The UPT service profile is a record containing all the information related to the UPT user in order to provide that user with the UPT service. Each UPT service profile is assoc

29、iated with a single UPT number. 5.9 users service profile. (See Note 1, clause 8.) UPT service profile management: This allows the UPT user to access, interrogate, and change the UPT 5.10 service profile. UPT serving exchange: This is any exchange that has the technical capabilities necessary to acc

30、ess a UPT 5.11 UPT user. UPT to UPT call: This is any outgoing call from a UPT user which terminates as an incoming call to another 6 Ab brevia tions For the purposes of this Recommendation, the following abbreviations are used: DTN Destination Terminal Number ISDN Integrated Services Digital Networ

31、k ISUP ISDN User Part ITU-T International Telecommunication Union - Telecommunication Standardization UPT Universal Personal Telecommunication 7 UPT call types This Recommendation provides the routing principles for three UPT call types: a) UPT InCall: Clauses 8 and 9; b) UPT OutCall: Clause 10; c)

32、UPT to UPT Call: Clause 11. 8 UPT InCall general routing model Figure 1 provides the general routing model for the UPT InCall. In the general model, a call is routed to an appropriate UPT serving exchange, where the call is recognized as UPT (It is possible that the call may have been identified as

33、UPT at a previous exchange) and a query is sent to the UPT users service profile which is identified by means of the dialled UPT number. The UPT users service profile is interrogated to provide the translation of the dialled UPT number into the destination terminal number associated with the termina

34、l at the current location designated by the called UPT user, and returns this number and possibly other routing information to the UPT serving exchange. Upon receipt of this number, the UPT serving exchange routes the call to the destination according to the routing principles in Recommendations E.

35、170 to E. 173, as appropriate. Recommendation E.174 (04/95) 3 - - ITU-T RECMN*E.L74 95 m 4862593 Ob02382 TOT 9 UPT service 6 profile number UPT i! DTN O O Caller Called UPT User UPT serving exchange T020405094D01 Connection - Queryhesponce path Information transfer _, NOTES 1 located in the originat

36、ing network, an assisting network or the terminating network. 2 It is important to note that the UPT service profile andor the UPT serving exchange may be The UP serving exchange may be an originating exchange. FIGURE 1E.174 General UPT InCaIl routing model 9 Applications of the InCall general routi

37、ng model Under the InCall general routing model, a number of applications are possible; the main distinction among them being how or where the UPT service profile is accessed. The identification of the applications below is not intended to be exclusionary, i.e. other applications may be possible und

38、er the general routing model. NOTES 1 When the called number is a UFT number and is translated in one or several data bases, there is a risk of circular routing or of exceeding the number of links. Means should be provided to restrict the number of UPT translations. This concern is only for InCalis.

39、 If the limit of the number of the links as defined in Recommendations E.171 to E.173 is exceeded, then the Quality of Service may be impacted. The location of the UPT serving exchange in the network or the use of signalling to avoid circuit connections may be a solution. 2 In order to maintain the

40、recommended transmission quality, the location of the UPT serving exchange must be carefully chosen. 9.1 “UPT service prvider-based routing A “WT service provider-based“ application of the InCall general routing model is depicted in Figure 2. In this application, the call to a UPT user is routed to

41、the UPT serving exchange. The UPT serving exchange interrogates the service profile of the called UFT user to determine the destination terminal number. The call is then progressed from the serving UPT exchange to the destination, or alternatively, a new call is established from the UPT serving exch

42、ange to the destination, following the routing principles in Recommendations E. 170 to E.173, as appropriate. 4 Recommendation E.174 (04/95) UPT service profile $i Terminating network Originating network :Ler 1 j *TN O Called UPT UPT cering user exchange T02wO60-94/d02 Connection -I- Querylresponse

43、path - Information transfer NOTE - It is important to note that the UPT service profile and/or the UPT serving exchange may be located in the originating network, an assisting network or the terminating network. FIGURE 2E. 174 “UPT service provider-based” routing 9.2 Call routing using ITU-T SS No,

44、7 ISUP redirection capabilities An application of the InCall general routing model using ITU-T SS No. 7 redirection is shown in Figure 3. In this application, the call to a UPT user is progressed to the UPT serving exchange using voice circuits operated with ITU-T SS No. 7 ISUP signalling with redir

45、ection capabilities. The UPT service profile is interrogated to determine the current destination terminal number of the called UFT user. But instead of progressing the call onward to the terminating network (or launching a new call to the terminating network), the call is released backward to the c

46、ontrolling ITU-T SS No. 7 ISUP exchange, where the call is routed directly to the number specified by the called UPT user, following the routing principles in Recommendations E.170 to E.173, as appropriate. NOTE - The definition of controlling ITU-T SS No. 7 ISUP exchange is included in ISUP Recomme

47、ndations (Q.761 to 4.764). 9.3 “Service profile query” procedure An application of the InCall general routing model using a “service profile query” procedure is shown in Figure 4. In this application, the UPT serving exchange in the call originating network initiates an interrogation to the UPT user

48、s service profile using ITU-T SS No. 7, in order to obtain the current destination terminal number of the called UPT user. The service profile returns the destination terminal number and possibly other routing information to the UPT serving exchange in the call originating network. The UPT serving e

49、xchange then routes the call to the destination according to the routing principles in Recommendations E.170 to E.173, as appropriate. Recommendation E.174 (04/95) 5 6 ITU-T RECMN*E-374 95 4862593 Ob02384 882 Originating network T i Um number I UPT UPT I senke Teminating network O / Called UPT user Connection - Query/recponse path - information transfer NOTE - It is important to note that the UPT service profile andor the UPT serving exchange may be located in the originating network, an assisting network or the terminating network