1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-1000619.1992(R2015) Integrated Services Digital Network (ISDN) Multi-Level Precedence and Preemption (MLPP) Service Capability As a leading technology and solutions development organization, ATIS brings together the top global ICT companies to
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5、cation Commission (CITEL). 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 w
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8、ses, or procedures not 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 Ameri
9、can National Standard 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 CAUTION NOTICE: This American National Standard may be revised or withdrawn at any tim
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11、stitute. Notice of Disclaimer also sent on expiration of timer T L . 75 LFB transaction messages (SS7/DSSl) . .77 I Page Annexes A DSSl SDL diagrams for MLPP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 B Breakdown of function
12、al models for the MLPP service with and without the LFB option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 . C invoke and return result comonents within the facility information element of DSSl for MLPP . . . . . . . . . . . . .
13、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 D Application of the signal information element to tones and alerting patterns for MLPP service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 E SS7 SDL diagrams for MLPP . . . . . . .
14、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 - ii Foreword (This foreword is not part of American National Standard T1.619-1992.) This American National Standard defines and describes the multi-level precedence and preemption (MLPP) sup
15、plementary service in the context of an integrated services digital network (ISDN). The MLPP service pro- vides a prioritized call handling service. This service has two parts - prece- dence and preemption. Precedence involves assigning to a call, on a per call basis, a priority level and validating
16、 the priority level. Preemption involves seizing of resources, which are in use by calls of lower prece- dences, by a higher precedence call in the absence of idle resources. Preemption may occur in the network or user access. As a service provider option, before preemption of lower precedence calls
17、, a network may pro- vide a search and reservation of network resources via a look-ahead for busy (LFB) function to ensure that network and called user access resources are available to complete the higher precedence call prior to pre- emption. This service applies to both an ISDN basic rate access
18、and an ISDN primary rate access. It is intended to supplement a) the basic circuit mode bearer services contained in ANSI Tl .604- 1990, American National Standard for Telecommunications - tntegrated services digital network (ISON) - Minimal set of bearer services for the basic rate interface; b) th
19、e signalling system number 7 (SS7) basic call signaling procedures contained in ANSI Tl ,113-l 988, American National Standard for Telecommunications - Signatling system number 7 (SS7) - tntegrated services digital network (ISON) user part; c) the digital subscriber signaling system number 1 (DSSl)
20、basic call signaling procedures contained in ANSI Tl .607-1990, American National Standard for Telecommunications - integrated services digital network (ISON) - Layer 3 signaling specification for circuit-switched bearer service for digital subscriber signaling system number 1 (OSSl); d) the generic
21、 procedures for use with ISDN supplementary services contained in ANSI T1.61 o-1990, American National Standard for Telecommunications - Digital subscriber signaling system number 1 (OSSl) - Generic procedures for the control of ISON supplementary services. This standard also defines the interaction
22、s of the MLPP service with other ISDN supplementary services. Manufacturers of ISDN user terminals and customer premise equipment (CPE) and manufacturers of ISDN switching equipment can apply this stan- dard to the design and development of their products. There are five annexes to this standard. An
23、nex A is normative and is con- sidered part of this standard; annexes 6 to E are informative and are not considered part of this standard. This standard was develped over the past several years by Technical Subcommittee TlSl of Accredited Standards Committee Tl - Telecommunications. Suggestions for
24、improvement of this standard will be welcome. They should be sent to the Exchange Carriers Standards Association, 1200 G Street, NW, Suite 500, Washington, DC 20005. - - - III This standard was processed and approved for submittal to ANSI by Accredited Standards Committee on Telecommunications, Tl.
25、Committee approval of the standard does not imply that all committee members voted for its approval. At the time it approved this standard, Accredited Standards Committee Tl had the following members: lvor N. Knight, Chairman Arthur K. Reilly, Vice-Chairman . 0. J. Gusella, Jr., Secretary Organizati
26、on Represented Name of Representative EXCHANGE CARRIERS Ameritech Services, Inc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Laurence A. Young Robert Koren (Alt.) Bell Atlantic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . John W. Seazholtz Roger Nucho (Ah.) Bellcore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G. Gary Schlanger Ralp
28、h E. Jensen (Alt.) Bellsouth Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Leonard Strickland, Jr. William J. McNamara, III (Alt.) Centel Corporation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
29、 . . . . . . . . . . . . . . . . . . . . . . . . . . . (Representation Vacant) Bruce Becker (Alt.) Cincinnati Bell Telephone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . William P. Keidel * T.C. Grimes (Alt.) Contel Corporation . . . . . . . . .
30、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Steve Linskey Stephen P. Welsh (Alt.) Exchange Carriers Standards Association . . . . . . . . . . . . . . . . . . . . . . . . . . Joseph Mendoza Gregory L. Theus (Ah.) GTE Telephone Operations . .
31、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gregory L. Theus _- - Richard L. Cochran (Alt.) . - National Telephone Cooperative Association . . . . . . . . . . . . . . . . . . . . . Joseph M. Flanigan NYNEX . . . . . . . . . . . . . . . . . . . . . . . .
32、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bencilla Jenkins cq_ Leo Katz (Alt.) Pacific Bell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
33、Fred Doell Stanley Chum (Alt.) Puerto Rico Telephone Company . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Segundo Ruiz Southwestern Bell Corporation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C. C. Bailey Joseph Mendoza (Alt.)
34、 U S West . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . James L. Eitel James Dahl (Alt.) United Telecommunications, Inc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
35、 . Robert P. McCabe . Harold L. Fuller (Alt.) US Telephone Association - USTA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Paul K. Hart Thomas Gajeski (Alt.) INTEREXCHANGE CARRIERS AT b) 3.1 -kHz audio (voice-band data); c) 64-kbit/s unrestricted (data). 2 Normative refere
36、nces 1 The following standards contain provisions which, through reference in this text, constitute provi- sions of this American 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
37、National Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated on the next page. 1 ANSI T1.619-1992 ANSI T1.113-1988, Telecommunications - Signaling system number 7 (SS7) - Integrated ser- vices digital network (ISDN) user part I) ANSI
38、 Tl ,114-l 988, Telecommunications - Signaling system number 7 (SS7) - Transaction capa- bility application part (TCA P) ) - ANSI T1.607-1990, Telecommunications - tntegrated services digital network (ISDN) - Layer 3 signaling specification for digital subscriber signaling system number 1 (DSSl) ANS
39、I T1.609-1990, Telecommunications - tnterworkino between the EDN user - network inter- face protocol and the signaling system number 7 ISDN user part ANSI T1.61 O-l 990, Telecommunications - Digital subscriber signaling Generic procedures for the control of ISDN supplementary services 3 Definitions
40、and abbreviations 3.1 Definitions The following terminology is used throughout this standard: system number 1 (DSSl) - 3.14 domain: An MLPP domain consists of a set of MLPP subscribers (MLPP users) and the network and access resources that are in use by that set of MLPP subscribers at any given time
41、. Connections and resources that are in use by MLPP subscribers may only be preempted by high- er precedence calls from MLPP subscribers within the same domain. - 3.unetwork: In this standard, “network” refers to all telecommunications equipment that has - any part in processing a call or a suppleme
42、ntary service for the user referred to. It may include local exchanges, transit exchanges, and NT2s but does not include the ISDN terminal and is not limifkd to the “public” network or any other particular set of equipment. 3.1.3 service provider: This is a company, organization, administration, bus
43、iness, etc., that sells, administers, maintains, charges for, etc. the service. The service provider may or may not be the provider of the network. 3.1.4 precedence: Precedence is the priority associated with a call. 3.1-S precedence call: A precedence call is a call with a precedence level higher t
44、han the Iow- est level of precedence. 3.1.6 MLPP call: An MLPP call is a call that has a precedence level established and is either being setup or is setup. In DSSl, an MLPP call is a call from an MLPP subscriber for which a SETUP has been sent but no DISCONNECT has been sent or received. In SS7, an
45、 MLPP call is a call with a precedence level for which the exchange has sent an initial address message (IAM) but has not sent or received a release (REL) message. 3.1.7 preempting call: A preempting call is a call with a precedence level higher than the lowest (i.e., ROUTINE) level of precedence, f
46、or which a call setup request has been received at the exchange. 3.1.8 active call: An active call is a call that has the connection established and the calling and called parties are active on the call. 3.1.9 preemptable circuit: A preemptable circuit is a circuit that is active with or reserved fo
47、r an MLPP call: (a) within the same domain as the preempting call, and (b) with a lower precedence than the preempting call. A busy or reserved circuit for which a precedence level has not been specified is not a preemptable circuit. l) At the time of publication, a revision of this standard was sub
48、mitted to ANSI for approval. Contact the sec- retariat for more recent information. 2 ANSI T1.619-1992 3.1.10 preemption initiating exchange: A preemption initiating exchange is the exchange that is congested (i.e., no idle circuits) and has received a preempting call setup. 3.1.11 congestion: Conge
49、stion has been encountered when it is determined that all circuits capable of routing the MLPP call are busy (i.e., no idle circuits). 3.1.12 Response timer T,: Response timer Tk is started when the network notifies the called user of a precedence call (for example, this would be the preemption notification if preemption occurs at the user interface). This timer establishes the time that the called party of the prece- dence call has to accept the incoming precedence call. The length of this timer is in the range of 4 - 30 seconds. 3.1.13 alternate party: An alternate party is the part
