1、 TIA DOCUMENT TIA/EIA-41-D Enhancements for Wireless Number Portability Phase II Addendum 1 TIA-756-A-1 (Addendum No. 1 to TIA-756-A) SEPTEMBER 2002 (Reaffirmed January 2008) TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Telecommunications Industry Association represents the communications sector of N
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18、F THE POSSIBILITY OF SUCH DAMAGES. THE FOREGOING NEGATION OF DAMAGES IS A FUNDAMENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. Wireless Number Portability TIA-756-A-1123456789101112131415161718192021222324252627282930313233
19、343536373839404142434445464748495051525354555657585960i ContentsCONTENTSRevision History iiChanges to Assumptions.1Assumptions.1TIA-756-A-1 Wireless Number PortabilityRevision History ii123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960REV
20、ISIONHISTORYRevision Date Remarks0 March 1998 Initial Publication (WNP Phase I)A December 1998 (WNP Phase II)Addendum 1 September 2002 NP Queries for Emergency Services CallsWireless Number Portability TIA-756-A-1123456789101112131415161718192021222324252627282930313233343536373839404142434445464748
21、495051525354555657585960Assumptions 1 Changes to AssumptionsCHANGESTOASSUMPTIONSThis Addendum identifies the changes to the TIA/EIA/IS-756-AAssumptions section thatare needed to support Number Portability (NP) Query for emergency services calls thathave portable called numbers.ASSUMPTIONS(See TIA/EI
22、A/IS-756-A, page viii)The following items are basic understandings used during the development of thisdocument:a. MobileDirectoryNumbers MDNs are the only wireless service providers E.164numbering resource that may be ported (e.g., Temporary Local DirectoryNumbers TLDNs, Remote Feature Control RFC p
23、orts, Roamer Ports are notported).b. This Number Portability document considers only “circuit mode calls.”c. Automatic Code Gapping (ACG) has not been addressed in this document.d. Short Message Service (SMS) has not been addressed in this document.e. Feature interaction support (e.g., Calling Name
24、Presentation CNAP) has notbeen addressed in this document.f. WNP impacts on message accounting (e.g., TIA/EIA-124) recommendations havenot been addressed in this document. g. WNP impacts to interface standards (e.g., TIA/EIA-93) have not been addressedsupported in this document. h. Only limited loca
25、tion portability is supported consistent with ANSI.T1.660. Thedesignation of portable numbers1may vary between systems. Establishing thegeographical areas within which Number Portability (NP) must be supported isbeyond the scope of this document.i. Number Portability DataBases (NPDBs) do not maintai
26、n records for numberswhich are not ported.j. NP queries are performed by an MSC for all calls to numbers recognized asportable numbers, except for calls to portable numbers that are assumed to be notported (see “a” above). NP queries are not performed for calls to operator servicesincluding calls di
27、aled as “0+” calls.NP queries are not performed for emergencyservices (e.g., 9-1-1) calls.k.TIA/EIA/IS-751MobileStationIdentity (MSID)(i.e., InternationalMobileStationIdentity IMSI or MobileIdentificationNumberMIN) is not portable.l. Public Switched Telephone Network (PSTN) directory numbers may be
28、portable.m. The HLR operations (i.e., messages) have not been modified to support WNP. Nonew parameters, new parameter fields or new parameter values have been addedto existing HLR operations and no support is provided for HLR initiated NumberPortability queries.1See Section 3.1 (page 3) for definit
29、ion of terms.TIA-756-A-1 Wireless Number Portability)Changes to Assumptions 2 Assumptions123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960n. An MSC which is Number Portability capable and has ISUP facilities supportsANSI.T1.660on those fa
30、cilities.o. Call looping should be avoided. However, no mechanism is provided by thisstandard to accomplish that objective.p. Roamer ports allow calls only to MSs known to be present in that system. NPqueries are not performed for Roamer Port calls unless the called MSs HLRredirects the call from th
31、e MS to a portable number.q. ANSI ISUP Release Cause value 26, Misrouted call to ported number, issupported to identify mismatches between the NPDB and HLR. Refinements tothe use of Cause value 26 are for further study.r. An MSC knows which DN ranges are portable, but an MSC does not necessarilyknow
32、 which individual MDNs have been ported.s. When the MSC is not able to obtain portability information from the NPDB, theMSC will default route the call.t. When a call is default routed to the donor MSC, and that MSC attempts to deliverthe call, the MSC performs a NumberPortabilityRequest (NPREQ) que
33、ry to do so.u. In a Number Portability environment the MobileIdentificationNumber (MIN) andMobileDirectoryNumber (MDN) may be different.v. Only the MDN shall be used by the Serving MSC in call services to identify thesubscriber externally (e.g., Emergency Services call back number, AutomaticNumber I
34、dentification). The Serving MSC shall not, in the absence of a successfulHLR response, make any assumption as to the equivalence of an MDN and a MIN.w. As this standard does not require the HLR to distinguish vacant numbers fromnumbers which have ported out, implementation specific HLR operations (e
35、.g.,signaling optimizations, forwarding number validation) may need to be modifiedso that service is not impacted. The required modifications are not addressed inthis document.x. An NP capable MSC may support an ISUP trunk group option for signaling theported number instead of the LRN as the called party number for outgoing callssent on that trunk group.y. Transit call handling (e.g., tandem calls) has not been addressed in this document.z. “Aging” and “Number Pooling” of MDNs have not been addressed in thisdocument, including their implications on the use of ANSI Cause value 26.
