ATIS 1000631-2005 Signaling System No 7 (SS7) C High Probability of Completion (HPC) Network Capability.pdf
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1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-1000631.2005(R2015) Signalling System No. 7 (SS7) High Probability of Completion (HPC) Network Capability As a leading technology and solutions development organization, ATIS brings together the top global ICT companies to advance the industrys
2、 most-pressing business priorities. Through ATIS committees and forums, nearly 200 companies address cloud services, device solutions, emergency services, M2M communications, cyber security, ehealth, network evolution, quality of service, billing support, operations, and more. These priorities follo
3、w a fast-track development lifecycle from design and innovation through solutions that include standards, specifications, requirements, business use cases, software toolkits, and interoperability testing. ATIS is accredited by the American National Standards Institute (ANSI). ATIS is the North Ameri
4、can Organizational Partner for the 3rd Generation Partnership Project (3GPP), a founding Partner of oneM2M, a member and major U.S. contributor to the International Telecommunication Union (ITU) Radio and Telecommunications sectors, and a member of the Inter-American Telecommunication Commission (CI
5、TEL). For more information, visit . AMERICAN NATIONAL STANDARD Approval of an American National Standard requires review by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is established when, in the judgment
6、of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concert
7、ed effort be made towards their resolution. The use of American National Standards is completely voluntary; their existence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures no
8、t conforming to the standards. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard
9、 in the name of the American National Standards Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of
10、the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Notice of Di
11、sclaimer Special marking of each set-up message by each network exchange to increase the probability of it being transferred to the next exchange in the case of congestion in the signaling network. This standard only describes the transfer of the indicator through an ISDN and the signaling interwork
12、ing with non-ISDNs. This network capability may be utilized by standardized or non-standardized services accessible to either ISDN or non-ISDN subscribers. 2 NORMATIVE REFERENCES The following standards contain provisions which, through reference in this text, constitute provisions of this American
13、National Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this American National Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated be
14、low. ATIS-1000631.2005 2 T1.111-1992, Signaling system no. 7 (SS7) Message transfer part (MTP).1T1.113-1992, Signaling system no. 7 (SS7) Integrated services digital network (ISDN) User part. 1T1.401-1988, Interface between carriers and customer installations Analog voicegrade switched access lines
15、using loop-start and ground-start signaling. 1T1.609-1990, Interworking between the ISDN usernetwork interface protocol and the signaling system number 7 ISDN user part. 1T1.615-1992, Digital subscriber signaling system no.1 (DSS1) Layer 3 overview. 13 GENERAL DESCRIPTION The configurations of netwo
16、rk entities described in this standard are depicted in Figure 1. The network entities and signaling interfaces shown with dashed lines are included for reference only and are not specified in this standard. The network and user equipment configurations shown are based on the “functional groupings” d
17、efined in T1.615 and applicable CCITT Recommendations on ISDN. Although these functional groupings may correspond to actual physical entities, actual implementations may incorporate more than one of these functional groupings in a single physical entity or may provide a subset of one or more of thes
18、e functional groupings. A summary of the functional groupings as used in this standard is as follows: Local Exchange (LE). In the configurations, this is the switch in the public network to which “users” are connected; Transit Exchange (TR). In the configurations, this is a switch in the public netw
19、ork that provides connections between two Local Exchanges; Signaling Transfer Point (STP). In the configurations, this is the switch that transfers the Signaling System 7 call set-up messages between LEs and TRs. For each message transfer, it may represent one or more sequential STPs. 3.1 Operation
20、at originating exchange The originating Local Exchange shall determine the need to mark a call set-up with the special NS/EP indicator; however, the method used is not covered by this standard, but could be provided by future standards. For example, it may perform this function by recognition of one
21、 or a combination of the following: A special access code such as *XXX preceding the dialed called party number; Call origination from a specially marked line; Recognition of a call to a unique called party number or range of numbers such as 710-950-XXXX; Administrative actions to activate the servi
22、ce for a period of time. The originating exchange shall perform the following two procedures: 1This document is available from the Alliance for Telecommunications Industry Solutions, 1200 G Street N.W., Suite 500, Washington, DC 20005. ATIS-1000631.2005 3 The special NS/EP indicator described in 4.1
23、.1.1 shall be included in the outgoing SS7 ISUP IAM message used to set-up the call; The outgoing IAM message shall be marked with a Congestion Priority Level of 1 (unless the operation of some other service has already resulted in its marking at a higher level). In the case of congestions in the si
24、gnaling network, this will prevent this message from being discarded until after all lower-priority messages have been discarded, in accordance with the procedures of T1.111. 3.2 Operation at the Transit Exchange The Transit Exchange shall recognize the need for special handling by detection of the
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