1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 1 TELECOMMUNICATION (03/93)STANDARDIZATION SECTOROF ITU30%#) National significant (ISDN) number See Recommendation E.164.International (ISDN) number See Recommendation E.164.Sub-address See Recommendation E.164.Served user It is the user of a particular I
2、SDN number who has subscribed to the presentation of the callingline identification information in association with incoming calls. The served user is also known as the calleduser.2 Recommendation Q.731 (03/93)Calling user It is the user that initiated an incoming call at the served user. The callin
3、g user need not havesubscribed to the CLIP supplementary service.Default number A national significant ISDN number registered within the public ISDN following priorarrangement between the calling user and the public ISDN.Special connection arrangement An arrangement between a customer and a public n
4、etwork operatorwhereby customer supplied calling party numbers are not screened by the public network.Access signalling system A part in the local exchange which handles the user-network interface protocol. Italso includes the screening functions.3.2.3 Qualification on the applicability to telecommu
5、nication servicesSee 3.2.3/I.251.3.2.4 State definitionsNo specific state definitions are required.3.3 Operational requirements3.3.1 Provision/withdrawalSee 3.3.1/I.251.3.3.2 Requirements on the originating network sideNot applicable.3.3.3 Requirements in the networkNo specific requirements are need
6、ed in the network.3.3.4 Requirements on the terminating network sideNot applicable.3.4 Coding requirementsi) Coding requirements if a special connection arrangement does not applySubclauses 3.8/Q.763 and 3.2/Q.763 give the coding for the calling party number and the access transportparameter which a
7、re required to support this service.The purpose of the calling party number parameter is to identify the origin of a call.The access transport parameter transports the calling party sub-address information element as definedin 4.5.11/Q.931 which is to identify a sub-address associated with the origi
8、n of the call.ii) Coding requirements if a special connection arrangement appliesIn addition to the coding requirements of i) above, the generic number parameter as specifiedin 3.20 c)/Q.763 is required.The purpose of the generic number parameter is to transport a calling party number provided by th
9、ecalling user with a special connection arrangement.The generic number parameter is accompanied by the parameter compatibility information parameter asspecified in 3.26 b)/Q.763. The procedures for the compatibility are defined in 2.9.5/Q.764.The allowed coding for the generic number parameter is as
10、 follows:a) Number qualifier indicator00000110 additional calling party numberb) Odd/even indicatorSee 3.7 a)/Q.763Recommendation Q.731 (03/93) 3c) Nature of address indicator0000001 subscriber number (for national use)0000010 unknown (for national use)0000011 national (significant) number0000100 in
11、ternational numberd) Internal network number indicator/number incomplete indicator (not used)0e) Numbering plan indicator001 ISDN (Telephony) numbering plan (Recommendation E.164)f) Address presentation restricted (Pres. Restric.) indicator00 presentation allowed01 presentation restrictedg) Screenin
12、g indicator00 user provided, not verified10 user provided, verified and failed (for national use)h) Address signals0000 digit 00001 digit 10010 digit 20011 digit 30100 digit 40101 digit 50110 digit 60111 digit 71000 digit 81001 digit 9i) FillerSee 3.7 h)/Q.763.3.5 Signalling requirements3.5.1 Activa
13、tion/deactivation/registrationNot applicable.3.5.2 Invocation and operation3.5.2.1 Actions at the originating local exchange3.5.2.1.1 Normal operationAll information pertaining to the CLIP supplementary service shall be inserted in the initial address message sent as partof the basic call procedures
14、 according to Recommendation Q.764.The calling party sub-address (if provided by the access signalling system) shall be transported transparently by thenetwork in the access transport parameter.If the numbering plan indicator received from the access signalling system together with a calling party n
15、umber is coded other than“ISDN (Telephony) numbering plan (Recommendation E.164)” or “unknown”, then the calling party number received from the accesssignalling system shall be discarded and the processing of the call shall continue as if no calling4 Recommendation Q.731 (03/93)party number was rece
16、ived. If the numbering plan indicator received from the access signalling system is coded“unknown”, then the originating local exchange shall treat this value as if the value “ISDN (Telephony) numbering plan(Recommendation E.164)” was received.If the screening indicator received from the access sign
17、alling system together with the calling party number is coded“user provided, not verified”, then the calling party number shall be entered in the generic number parameter. In thisparameter, the number qualifier indicator shall be set to “additional calling party number” and the screening indicator t
18、o“user provided, not verified”. If the numbering plan indicator received is coded “ISDN (Telephony) numbering plan(Recommendation E.164)” or “unknown”, then the nature of address indicator shall be set to “international number” or“national (significant) number” as received from the access signalling
19、 system.NOTES1 As a national option, some networks may allow for the screening indicator “user provided, verified and failed”. If thisscreening indicator is supported, then the originating local exchange shall treat this value in the same manner as the value “userprovided, not verified”.In addition,
20、 the originating local exchange shall enter the default number associated with that access in the calling partynumber parameter. In this parameter, the screening indicator shall be set to “network provided” and the nature of address indicator to“national (significant) number”.If the screening indica
21、tor received from the access signalling system together with the calling party number is coded otherthan “user provided, not verified”, then the originating local exchange shall enter the calling party number as received from the accesssignalling system in the calling party number parameter. The scr
22、eening indicator of the calling party number parameter shall be set asreceived from the access signalling system.2 In the latter case, allowed values for the screening indicator are “network provided” and “user provided, verified andpassed”.If no calling party number is received from the access sign
23、alling system, the originating local exchange shall enter thedefault number associated with that access in the calling party number parameter. The screening indicator shall be set to“network provided” and the nature of address indicator to “national (significant) number”.The calling party number inc
24、omplete indicator of the calling party number parameter shall be set to “complete”.The numbering plan indicator of the calling party number parameter shall be set to “ISDN (Telephony) numbering plan(Recommendation E.164)”.The numbering plan indicator of the generic number parameter shall be set to “
25、ISDN (Telephony) numbering plan(Recommendation E.164)” if this value or “unknown” was received from the access signalling system.The address presentation restricted indicators of the calling party number and the generic number parameter shall both beset to the value “presentation allowed” or “presen
26、tation restricted” as received from the access signalling system.The actions at the originating local exchange and the resulting codepoints are summarized in Table 3-1.3.5.2.1.2 Exceptional proceduresNo exceptional procedures are identified.3.5.2.2 Actions at the transit exchange3.5.2.2.1 Normal ope
27、rationA transit exchange shall transfer all information relating to the CLIP and CLIR supplementary services transparently tothe succeeding exchange.NOTE In interworking with the mobile network, the mobile telephony exchange may provide the transit exchange withan international calling party number
28、that has a country code other than the country code of the transit exchange.3.5.2.2.2 Exceptional proceduresNo exceptional procedures are identified.Recommendation Q.731 (03/93) 5TABLE 3-1/Q.731Calling party number, codepointsInformation provided by the accesssignalling systemInformation transported
29、 by the networkCalling partynumberNumberingplanScreeningindicatorCalling partynumberNumberingplanNature ofaddressindicatorScreeningindicatorCalling party number parameterNoneDefaultnumber“E.164”“national(significant)number”“networkprovided”No generic number parameter indicating “additional calling p
30、artynumber” is sentCalling party number parameterAnynumbera)Other than“E.164” or“unknown”Defaultnumber“E.164”“national(significant)number”“networkprovided”No generic number parameter indicating “additional calling partynumber” is sentCalling party number parameterAny digitsequenceconformingto E.164“
31、E.164” or“unknown”“networkprovided” or“userprovided,verified andpassed”Numberprovided bythe accesssignallingsystem“E.164” “national(significant)number” or“internationalnumber” asprovided bythe accesssignallingsystem“networkprovided” or“userprovided,verified andpassed”No generic number parameter indi
32、cating “additional calling partynumber” is sentCalling party number parameterDefaultnumber“E.164”“national(significant)number”“networkprovided”Generic number parameter for “additional calling party number”Any digitsequenceconformingto E.164“E.164” or“unknown”“userprovided, notverified”b)Numberprovid
33、ed bythe accesssignallingsystem“E.164” “national(significant)number” or“internationalnumber” asprovided bythe accesssignallingsystem“userprovided, notverified”b)a)In this case, the calling party number received from the access signalling system shall be discarded, but the addresspresentation restric
34、ted indicator shall (as in all other cases) be set to the value as received from the access signalling system.b)As a national option, some networks may allow for the screening indicator “user provided, verified and failed”. If thisscreening indicator is supported, then the originating local exchange
35、 shall treat this value in the same manner as the value“user provided, not verified”.6 Recommendation Q.731 (03/93)3.5.2.3 Actions at the outgoing international gateway exchange3.5.2.3.1 Normal operationIf the address presentation restricted indicator of the received calling party number parameter i
36、s set to “presentationrestricted”, the outgoing international gateway exchange shall act according to the bilateral agreement between the twonetworks (see 4.2.1/I.251 and 4.5/I.251). If the address presentation restricted indicator of the received calling partynumber parameter is set to “address not
37、 available”, then the calling party number parameter shall be omitted from theinitial address message. If the calling party number parameter is not sent across the international section, then the genericnumber parameter shall be omitted from the initial address message if its number qualifier indica
38、tes “additional callingparty number”.The exchange shall convert the calling party number conveyed in the calling party number parameter to an internationalnumber (if necessary) and set the nature of address indicator to “international number”. The address presentationrestricted indicator and the scr
39、eening indicator shall be transferred transparently.If the generic number parameter is received and its number qualifier indicates “additional calling party number” and thenumbering plan indicator is coded “ISDN (Telephony) numbering plan (Recommendation E.164)”, then the genericnumber parameter sha
40、ll be treated in the same manner as the calling party number parameter.NOTES1Without bilateral agreement for the transport of “user provided, verified and failed” numbers between networks, thegeneric number parameter shall be discarded if its number qualifier indicates “additional calling party numb
41、er” and the screeningindicator is coded “user provided, verified and failed”.2 The address presentation restricted indicator in both the calling party number and generic number parameters are setto the same value. They can have the values “presentation allowed” or “presentation restricted” (based on
42、 the bilateral agreement).3.5.2.3.2 Exceptional proceduresIf no calling party number parameter is received from the incoming network, then no calling party number parametershall be sent to the succeeding exchange.If the calling party number incomplete indicator is set to “incomplete”, then no callin
43、g party number parameter shall besent to the succeeding exchange.3.5.2.4 Actions at the incoming international gateway exchange3.5.2.4.1 Normal operationThe exchange shall check if the country code of the calling party number is the networks own country code. If this isthe case, then the country cod
44、e shall be removed. The nature of address indicator shall be set to “national (significant)number”. The address presentation restricted indicator and the screening indicator shall be transferred transparently.NOTE As a national option, the incoming international gateway exchange may add a prefix to
45、the calling party number.In this case the nature of address indicator shall be set to “unknown”.If the generic number parameter is received and its number qualifier indicates “additional calling party number” and thenumbering plan indicator is coded “ISDN (Telephony) numbering plan (Recommendation E
46、.164)”, then the genericnumber parameter shall be treated in the same manner as the calling party number parameter.3.5.2.4.2 Exceptional proceduresIf no calling party number parameter is received from the preceding exchange, then no calling party number parametershall be sent to the outgoing network
47、.If the address presentation restricted indicator of the received calling party number parameter is set to “address notavailable”, then this value shall be passed on transparently. The screening indicator shall be set to “network provided”.NOTE As a national option, the nature of address indicator i
48、n the calling party number parameter can be set to“unknown”.Recommendation Q.731 (03/93) 73.5.2.5 Actions at the destination local exchange3.5.2.5.1 Normal operationWhen the destination local exchange receives an initial address message, basic call handling shall occur and theexchange shall send a s
49、et-up request to the access signalling system.It is a function of the user-network interface to check whether the called user has subscribed to the CLIP supplementaryservice or not and not to present the calling party sub-address, where appropriate, to the user.If the generic number parameter with a number qualifier set to “additional calling party number” is provided, then theinformation conveyed in this parameter shall be presented first to the access signalling system. The informationconveyed in the calling party number parameter shall be sent to
