1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 ) TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU).4%2!4%$G0G03%26)#%3G0G0$)4!,G0G0.%47/2+G0 )3$.G93%26)#%G0G0#!0!“),)4)%3$% its description is not yet included.3 Association of supplementary services to bearer services and teleservicesTable 1/I.250 shows t
2、he association of supplementary services to basic bearer services and basic teleservicesidentified so far. Their provision in a particular ISDN is a network providers option. Other associations are for furtherstudy.Service Recommendations of the F-Series may recommend the individual provision of sup
3、plementary serviceswith teleservices, for example, the provision with the telematic services Teletex, Telefax, Mixed Mode, etc.4 Definitions of supplementary servicesa) At stage 1 of the description method the services are described from the users perspective, but do notconcern details of the human
4、interface itself. For example, in Call Waiting there is a statement that theserved user “shall be informed” that a call is waiting. It does not specify whether this shall beaccomplished by a bell, a light, a synthesized voice, etc.b) Similarly, the stage 1 service description is independent of the a
5、mount of functionality in the usersterminal other than that required to provide the human interface. For example, the Conference CallingService description is designed to be independent of whether the conference bridge is in the terminal, inthe serving exchange, or elsewhere.c) While the service des
6、criptions are directly applicable to public networks, it is expected that the design ofprivate networks will take these descriptions into account in order to ease the interworking between publicand private networks.d) Although reference is made to human users, there is no restriction on a machine or
7、 procedures being theuser of these supplementary services. Examples include automatic answering terminals, voiceannouncement systems, etc.e) Combining points a) to d), there is no prohibition against “machines” (e.g. call distributors) that use theCCITT described services and then offer the same or
8、other (e.g. customized) services to their users.f) Lastly, the “machine” referred to above could, in fact, be an entire private network.Fascicle III.7 - Rec. I.250 3TABLE 1/I.250Association of supplementary services to basic bearer services and to basic teleservices supported by ISDNCircuit mode bea
9、rer services TeleservicesSupplementary services64 kbit/sunrestricteddemand64 kbit/sspeechdemand64 kbit/s,3.1 kHzaudiodemand64 kbit/sunrestrictedpermanent64 kbit/s,3.1 kHzaudiopermanent1920 kbit/sunrestrictedpermanentTelephony Teletex Telefax 4 VideotexMixedmodeDirect-dialling-in X X X X X X X XMulti
10、ple subscriber number X X X X X X X XCalling line identification presentation X X Xb) b) b)XXXXCalling line identification restriction X X Xb) b) b)XConnected line identification presentation X X Xb) b) b)XXXXConnected line identification restriction X X Xb) b) b)XMalicious calls identificationa)Sub
11、-addressinga)Call transfert X X X XCall forwarding busy X X X XCall forwarding no reply X X X X XCall forwarding unconditional X X X X XCall deflectiona)Line hunting X X X XCall waiting X X X XCall hold X X X XCompletion of calls to busy subscribersa)Conference calling X X X XThree party service X X
12、 X XClosed user group X X X X X X X XPrivate numbering plana)Credit card callinga)Advice of charge X X X X X X X XReserve charginga)User-to-user signalling X X Xb) b) b)XXX XX denotes applications of supplementary services identified within each supplementary service description; other associations
13、are for further study.a)This supplementary service is not yet included in the descriptions.b)Further study is required on the association of this supplementary service to this circuit mode bearer service.4 Fascicle III.7 - Rec. I.2504.1 Number Identification supplementary services (Recommendation I.
14、251)I.251.1 Direct Dialling In (DDI) is a supplementary service which enables a user to directly call another user on aISPBX or other private system without attendant intervention.I.251.2 Multiple Subscriber Number (MSN) is a supplementary service which provides the possibility for assigningmultiple
15、 ISDN numbers to a single interface.I.251.3 Calling Line Identification Presentation (CLIP) is a supplementary service offered to the called party whichprovides the calling partys ISDN number, possibly with sub-address information, to the called party.I.251.4 Calling Line Identification Restriction
16、(CLIR) is a supplementary service offered to the calling party torestrict presentation of the calling partys ISDN number and sub-address to the called party.I.251.5 Connected Line Identification Presentation (COLP) is a supplementary service offered to the calling partywhich provides the connected p
17、artys ISDN number to the calling party.I.251.6 Connected Line Identification Restriction (COLR) is a supplementary service offered to the connectedparty to restrict presentation of the connected partys ISDN number to the calling party.I.251.7 Malicious call identification (Definition not yet include
18、d, further study is needed).I.251.8 Sub-addressing (Definition not yet included, further study is needed).4.2 Call Offering supplementary services (Recommendation I.252)I.252.1 Call Transfer is a supplementary service which enables a user to transfer an established (i.e. active) call to athird party
19、. For the original call, the served user may have been either the calling or called party (i.e. it may have beeneither an incoming or outgoing call).I.252.2 Call Forwarding Busy (CFB) is a supplementary service which permits a served user to have the networksend to another number all incoming calls
20、for the served users ISDN number (or just those associated with a specifiedbasic service) which meet busy at the served users ISDN number. The served users originating service is unaffected.I.252.3 Call Forwarding No Reply (CFNR) is a supplementary service which permits a served user to have thenetw
21、ork send to another number all incoming calls for the served users ISDN number which meet no reply (or just thoseassociated with a specific basic service which meet no reply). The served users originating service is unaffected.I.252.4 Call Forwarding Unconditional (CFU) is a supplementary service wh
22、ich permits a served user to have thenetwork send to another number all incoming calls for the served users ISDN number (or just those associated with aspecified basic service). The served users originating service is unaffected. If this service is activated, calls areforwarded regardless of the con
23、dition of the termination.I.252.5 Call Deflection (Definition not yet included, further study is needed).I.252.6 Line Hunting is a supplementary service which enables incoming calls to a specific ISDN number to bedistributed over a group of interfaces.4.3 Call Completion supplementary services (Reco
24、mmendation I.253)I.253.1 Call Waiting is a supplementary service which permits a subscriber to be notified of an incoming call (as perBasic Call procedures) with an indication that no interface information channel is available. The user then has the choiceof accepting, rejecting or ignoring the wait
25、ing call (as per Basic Call procedures).I.253.2 Call Hold is a supplementary service which allows a user to interrupt communications on an existingcall/connection and then subsequently, if desired, reestablish communications.I.253.3 Completion of Calls to Busy Subscribers (Definition not yet include
26、d, further study is needed).Fascicle III.7 - Rec. I.250 54.4 Multiparty supplementary services (Recommendation I.254)I.254.1 Conference Calling is an ISDN supplementary service which allows a user to communicate simultaneouslywith multiple parties, which may also communicate among themselves.I.254.2
27、 Three-Party Service is a supplementary service which enables a user who is active on a call to hold that call,make an additional call to a third party, switch from one call to the other as required (privacy being provided betweenthe two calls), and/or release one call and return to the other. Optio
28、nally, the served user could subscribe to an ability tojoin the two calls together into a three-way conversation.4.5 Community of Interest supplementary services (Recommendation I.255)I.255.1 Closed User Group (CUG) is a supplementary service which enables users to form groups, to and from whichacce
29、ss is restricted. A specific user may be a member of one or more CUGs. Members of a specific CUG cancommunicate among themselves but not, in general, with users outside the group. Specific CUG members can haveadditional capabilities that allow them to originate calls outside the group, and/or to rec
30、eive calls from outside the group.Specific CUG members can have additional restrictions that prevent them from originating calls to other members of theCUG, or from receiving calls from other members of the CUG.I.255.2 Private Numbering Plan (Definition not yet included, further study is needed).4.6
31、 Charging supplementary services (Recommendation I.256)I.256.1 Credit Card Calling (Definition not yet included, further study is needed).I.256.2 Advice of Charge is a supplementary service allowing the user paying for a call to be informed of usage-basedcharging information.This service may include
32、 one or more of the following cases:1) Charging information at the end of the call.2) Charging information during a call.3) Charging information at call setup time.I.256.3 Reverse charging (Definition not yet included, further study is needed).4.7 Additional information transfer supplementary service (Recommendation I.257)I.257.1 User-to-User Signalling (UUS) is a supplementary service which allows an ISDN user to send/receive alimited amount of information to/from another ISDN user over the signalling channel in association with a call to theother ISDN user.
