ATIS 1000621-2014 Integrated Services Digital Network (ISDN) C User-to-User Signaling Supplementary Service.pdf

1、 ATIS-1000621.2014 Integrated Services Digital Network (ISDN) User-to-User Signaling Supplementary ServiceAMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS As a leading technology and solutions development organization, ATIS brings together the top global ICT companies to advance the industrys most-

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11、er 3.1 kHz audio (voiceband data); 64 kbit/s unrestricted data. 2 Normative References The following standards contain provisions which, through reference in this text, constitute provisions of this American National Standard. At the time of publication, the editions indicated were valid. All standa

12、rds are subject to revision, and parties to agreements based on this American 6 ATIS-1000621.2014 National Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. ATIS-1000113.2005(R2010), Telecommunications Signaling System Numbe

13、r 7 (SS7) Integrated Services Digital Network (ISDN) user part.1ATIS-1000603.1993(R2009), Telecommunications Integrated Services digital network (ISDN) Minimal set of bearer services for the primary rate interface2ATIS-1000604.1990(R2009), Telecommunications Integrated Services digital network (ISDN

14、) Minimal set of bearer services for the basic rate interface3ATIS-1000607.2000(R2009), Telecommunications Integrated Services Digital Network (ISDN) Layer 3 signaling specification for circuit- switched bearer service for Digital Subscriber Signaling System Number 1 (DSS1)4ATIS-1000609.1999(R2009),

15、 Telecommunications Interworking between the ISDN user-network interface protocol and the signalling system number 7 ISDN user part5ATIS-1000610.1998(R2013), Telecommunications Digital Subscriber Signalling System Number 1 (DSS1) Generic procedures for the control of ISDN supplementary services63 De

16、finitions In this standard the following terminology applies: 3.1 UUS: User-user signaling. 3.2 UUS service: User-user signaling service 1, as defined in ITU-T Recommendation I.257.1 (implicit). 3.3 user information (UUI): User generated information contents of the DSS1 User-user information element

17、s or the ISUP user-to-user information parameter. 3.4 UUIE: DSS1 User-user information element. 3.5 served user: The user who requests UUS service. 3.6 network: All telecommunications equipment which has any part in processing a call or a supplementary service for the referred to user. It may includ

18、e Local Exchanges, and NT2s, 1This document is available from the Alliance for Telecommunications Industry Solutions (ATIS), 1200 G Street N.W., Suite 500, Washington, DC 20005 2This document is available from the Alliance for Telecommunications Industry Solutions (ATIS), 1200 G Street N.W., Suite 5

19、00, Washington, DC 20005 3This document is available from the Alliance for Telecommunications Industry Solutions (ATIS), 1200 G Street N.W., Suite 500, Washington, DC 20005 4This document is available from the Alliance for Telecommunications Industry Solutions (ATIS), 1200 G Street N.W., Suite 500,

20、Washington, DC 20005 5This document is available from the Alliance for Telecommunications Industry Solutions (ATIS), 1200 G Street N.W., Suite 500, Washington, DC 20005 6This document is available from the Alliance for Telecommunications Industry Solutions (ATIS), 1200 G Street N.W., Suite 500, Wash

21、ington, DC 20005 7 ATIS-1000621.2014 but does not include the ISDN terminal and is not limited to the “Public” network or any other particular set of equipment. 3.7 service provider: This is a company, organization, administration, business, etc.,that sells, administers, maintains, charges for, etc.

22、 the service. The service provider may or may not be the provider of the network. 3.8 contention: Contention exists on the called interface if more than one terminal is expected to respond to a setup request sent by the network, based on the contents of the setup request. a) If contention applies to

23、 an incoming (to user) call, the network will allow more than one terminal to respond to a call setup request sent by the network. In this case, the network shall not award the call to a particular user equipment until a terminal has indicated called party answer, by sending a connect message. b) If

24、 contention is not allowed, the network shall award the call only to the first called user equipment that responds to the setup message and does not indicate terminal incompatibility. 4 Description 4.1 General Description UUS service allows the user to send and receive limited amounts of user genera

25、ted information to and from another user-network interface. This information is passed transparently (i.e., without modification of contents) through the network. Although the delivery of the user information is not guaranteed, it is expected to be delivered with a high probability. The network will

26、 not interpret or act on this information. Where multiple network providers comprise the network, delivery of UUS service information may require multilateral agreements among involved network providers. The user can transfer user information during the setup and clearing phases of a call, with user

27、 information embedded within certain call control messages. 4.2 Procedures 4.2.1 Provision/withdrawal The UUS service may be provided on a subscription basis or, as a service provider option, may be provided to some or all users without subscription. UUS service may be withdrawn for administrative r

28、easons or at the request of the subscriber. As a service provider option, UUS service can be offered to the calling user with the subscription options given in table 1. The options apply separately to each ISDN number and bearer service combination or each interface. 4.2.2 Normal Procedures 4.2.2.1

29、Activation/deactivation The calling party activates the UUS service (implicit 1) by including a User-user information element (UUIE), which may contain user information in the SETUP message. If the calling party has subscribed to the UUS service, the network will accept and transfer UUIE from both t

30、he calling party and the called party during call establishment and call clearing phases for that particular call. 8 ATIS-1000621.2014 4.2.2.2 Invocation b) Called user is not an ISDN User (see 4.3); c) Protocol error; d) Necessary interoffice signaling connectivity does not exist between sending an

31、d destination users. 4.2.3.2 Invocation b) Receive and process functional indications relating to the UUS service request from FE3, and relay them to the calling user; for example, FE1 may receive: a. Notification that the user information has been discarded when it cannot be delivered to the called

32、 user, or when there is not sufficient interoffice signaling connectivity to allow the transfer of user information, if the UUS Delivery subscription parameter is set to “Preferred”; b. An indication of the clearing of the call and notification that the UUS service request has been rejected; for exa

33、mple, when the UUS service request cannot be satisfied by the network, when the user information has been discarded due to interworking, or when the user information has been discarded due to an inter- action with another supplementary service (such as call forwarding), if the UUS Delivery subscript

34、ion parameter is set to “required”. After initiating a call that activates the UUS service, FEI may: send additional user information in the first clearing message sent to FE3; process user information received from FE3 in either a call control message (during call establishment) or in the first cle

35、aring message for the call, and relay this information to the calling user. 5.1.2 Description of Functional Entity 2 Functional Entity 2 (FE2) provides the functional support of a possible NT2 connection for FE1; this may provide a gateway function to a private network. FE2 may or may not exist, dep

36、ending upon the allocation of equipment scenario for which the UUS service is applied (see 5.3). When FE2 does exist, the UUS service is still subscribed to at FE3. The FE2 should provide the following functionality in support of FE3: a) If user information is included in a call setup request receiv

37、ed at FE2, then FE2 should be capable of sending this user information to FE3; b) If user information is not included in the call setup request received at FE2, FE2 may provide user information (based on the called destinations address) on behalf of the calling party in the call setup request sent t

38、o FE3; c) If an error condition exists in its invocation (e.g., the UUS service had not been subscribed at FE3), FE2 may reject a UUS service activation. In this case, FE2 should 16 ATIS-1000621.2014 discard the user information, send a notification in the backward direction indicating that the UUS

39、service request had been rejected, and send the call setup request without the user information to FE3; d) Receive and process functional indications relating to the UUS service request from FE3 and relay them in the backward direction; e) Receive additional user information in the first clearing me

40、ssage for the call and send this user information to FE3; f) Process user information received from FE3 in either a call control message (during call establishment) or in the first clearing message for the call, and send this information to FE1. Figure 3 - Functional entity model for the user-to-use

41、r signaling service 17 ATIS-1000621.2014 Table 2 -User-to-user signaling service scenarios 5.1.3 Description of Functional Entity 3. Functional Entity 3 (FE3) provides the functional support of a Local Exchange connection for FE1 (or FE2 if it exists). FE3 is the “origination network” for the callin

42、g user, and it may or may not be the same Local Exchange connection as for the called user (FE5). As the originating network, FE3 accepts call setup requests and processes UUS service requests from FE1 or FE2. FE3 treats calls originated from either FE1 or FE2 in the same manner. FE3 provides the fo

43、llowing functionality in support of FE1 (or FE2 if it exists) and when a call setup request containing user information is received from FE1 or FE2: a) Determine if the user has subscribed to UUS service. If the UUS service has not been subscribed to, then: a. the user information shall be discarded

44、, but the call setup request shall be processed; b. a notification shall be sent toward FE1 or FE2 indicating that the user information has been discarded; b) Determine if the user information included in a call setup request can be processed. If so, then the user information shall be sent to FE4; 1

45、8 ATIS-1000621.2014 c) If there is not sufficient interoffice signaling connectivity available to process the user information in the call setup request, or if there is a protocol error in the user information, then the action taken by FE3 is dependent upon the UUS Delivery subscription parameter fo

46、r the calling user: a. if the UUS Delivery subscription parameter is set to “preferred”, then the call setup request shall be sent to FE4 without the user information, and a notification shall be sent to FE1 indicating that the user information has been discarded; b. if the UUS Delivery subscription

47、 parameter is set to “required”, then a rejection of the call setup request shall be sent to FE1 with an indication that the UUS service request has also been rejected; d) If FE3 determines that the user information has been discarded in the network (e.g., due to interworking or discarded due to an

48、interaction with another supplementary service, such as call forwarding), then the action taken by FE3 is dependent upon the UUS Delivery subscription parameter for the calling user: a. if the UUS Delivery subscription parameter is set to “preferred”, then a notification shall be sent to FE1 indicat

49、ing that the user information has been discarded; b. if the UUS Delivery subscription parameter is set to “required”, then FE3 shall initiate a clearing of the call and rejection of the call setup request shall be sent to FE1 with an indication that the UUS service request has also been rejected. After establishing a call that activates the UUS service, FE3: a) May receive from FE1 (or FE2 if it exists) additional user information in the first clear- ing message for the call; this information is sent toward FE7; b) Processes user information received from F