1、 TIA/EIAINTERIM STANDARDTIA/EIA-41-D Based NetworkEnhancements for Answer Hold (AH)TIA/EIA/IS-837JULY 2000TELECOMMUNICATIONS INDUSTRY ASSOCIATIONRepresenting the telecommunications industry inassociation with the Electronic Industries Alliance TIA/EIA/IS-837NOTICETIA/EIA Engineering Standards and Pu
2、blications are designed to serve the public interest through eliminatingmisunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement ofproducts, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for hisparticular n
3、eed. Existence of such Standards and Publications shall not in any respect preclude any member ornonmember of TIA/EIA from manufacturing or selling products not conforming to such Standards and Publications,nor shall the existence of such Standards and Publications preclude their voluntary use by th
4、ose other than TIA/EIAmembers, whether the standard is to be used either domestically or internationally.Standards and Publications are adopted by TIA/EIA in accordance with the American National Standards Institute(ANSI) patent policy. By such action, TIA/EIA does not assume any liability to any pa
5、tent owner, nor does itassume any obligation whatever to parties adopting the Standard or Publication. TIA/EIA INTERIM STANDARDSTIA/EIA Interim Standards contain information deemed to be of technical value to the industry, and are published atthe request of the originating Committee without necessar
6、ily following the rigorous public review and resolution ofcomments which is a procedural part of the development of a TIA/EIA Standard.TIA/EIA Interim Standards should be reviewed on an annual basis by the formulating Committee and a decisionmade on whether to proceed to develop a TIA/EIA Standard o
7、n this subject. TIA/EIA Interim Standards must becancelled by the Committee and removed from the TIA/EIA Standards Catalog before the end of their third year ofexistence.Publication of this TIA/EIA Interim Standard for trial use and comment has been approved by theTelecommunications Industry Associa
8、tion. Distribution of this TIA/EIA Interim Standard for comment shall notcontinue beyond 36 months from the date of publication. It is expected that following this 36 month period, thisTIA/EIA Interim Standard, revised as necessary, will be submitted to the American National Standards Institute fora
9、pproval as an American National Standard. Suggestions for revision should be directed to: Standards Telecommunications Industry Association;1997.ASSUMPTIONSThe following items are basic understandings used during the development of thisdocument:a. The AH feature shall be applicable to all terminatin
10、g voice call deliveries(e.g., unanswered voice calls in the Alerting or Call Waiting state)permitting called AH subscribers to answer a terminating call and place itimmediately on hold, allowing conversation to begin at a later moreconvenient time.b. When the AH authorized called party activates the
11、 AH feature, the callingparty shall be provided an appropriate network announcement (e.g., asdefined by the service provider) indicating the call delivery is in progress.c. Terminating calls are in the answer state when AH is invoked (i.e., answersupervision is returned).d. A terminating call in the
12、 AH state shall normally remain in the AH stateuntil:- the called AH subscriber retrieves the call (e.g., SEND ).- the calling party disconnects.e. AH and Call Waiting (CW) authorized subscribers, active with an inprogress call and with another terminating call on hold (e.g., receiving AHtreatment),
13、 shall be permitted to retrieve the call in the AH state withnormal CW procedures (e.g., SEND terminate AH treatment, place theother party on hold, connect the AH called subscriber to the calling party inthe AH state, and enter the 2-way CW state).f. When the AH service has been invoked, the AH stat
14、e should be maintainedduring all handoff processes.g. When the call is released for any reason, the AH state shall be automaticallyreleased.h. If digits are sent to the network by an MS when the MS is instructed by theuser to invoke AH, the only digits sent are a prestored digit string associatedto
15、AH invocation. The contents of the MSs buffers are not sent ormodified.i. A serving network shall notify served mobile stations that it supports AHso mobile stations may determine when AH may be offered as an option tothe subscriber.j. The mobile station shall not offer AH as an option to the user u
16、nless thesystem to which the MS is registered supports AH. Additionally, thev ForewordTIA/EIA/IS-837123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960mobile station shall not offer AH as an option when alerting an idlesubscriber unless the
17、 air interface currently in use supports the signalingneeded for AH invocation for incoming calls to idle subscribers.k. A call in the AH state can be retrieved by a flash with or without digits.Foreword viTIA/EIA/IS-83712345678910111213141516171819202122232425262728293031323334353637383940414243444
18、5464748495051525354555657585960REVISION HISTORYRevision Date Remarks1.0 July, 2000 Initial publication.EDITORIAL KEYa. ANSI-41-D, ANSI-124-B or ANSI-664-A totally new sections are identifiedvia text with right hand margin “diffmarks“, as:A totally new sections text.b. ANSI-41-D, ANSI-124-B or ANSI-6
19、64-A new enhanced text is identifiedvia text with “under-score“ lines and right hand margin “diffmarks“, as:. . existing text new enhanced text existing text. . .c. ANSI-41-D, ANSI-124-B or ANSI-664-A deleted existing text is identifiedvia text with “strike-through“ lines and right hand margin “diff
20、marks“, as:. . existing text deleted text existing text . .vii Revision HistoryTIA/EIA/IS-8371234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859601. INTRODUCTION1.1 OBJECTIVEThis Interim Standard (IS) presents Stage-1 (new chapter TIA/EIA-664
21、-B), Stage-2(TIA/EIA-41.3-D enhancements), and Stage-3 (TIA/EIA-41.5-D and TIA/EIA-41.6-Denhancements) recommendations for supporting the Answer Hold (AH) feature use inthe Wireless Radiotelephone Service.1.2 SCOPEThis document specifies the wireless intersystem network operation enhancementsrequire
22、d for supporting roaming subscribers with the Answer Hold (AH) feature.1.3 ORGANIZATIONThis document is organized as per TIA/EIA-41-D and TIA/EIA-664-A.2. REFERENCES2.1 Normative ReferencesANSI T1 Standards:TIA/EIA: ANSI/TIA/EIA-41-D Cellular Radiotelecommunications IntersystemOperations; Telecommun
23、ications Industry Association; December 1997. TIA/EIA-124-B Wireless Radio Telecommunications Intersystem Non-Signaling Data Communication DMH (Data Message Handler);Telecommunications Industry Association; July 1999. TIA/EIA-664 Cellular Features Description; Telecommunications IndustryAssociation;
24、 January 1996.1 IntroductionTIA/EIA/IS-8371234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859603. TIA/EIA-664-A “CELLULAR FEATUREDESCRIPTIONS” MODIFICATIONSThis section provides the Stage-1 feature description for Answer Hold (AH) accordingto
25、 the structure of TIA/EIA-664-A.3.1 Definitions(TIA/EIA-664-001-A, page 4)Answer Hold (AH)See Answer Hold.Switch Control Code (SCC)A Switch Control Code consists of a terminating “*” preceded by the one, two, orthree digits of a Switch Control Value (as in: SCV*).Switch Control Code String (SCCS)A S
26、witch Control Code String is a digit string consisting of a Switch Control Codefollowed by a termination address (as in SCV* + termination address).Switch Control Value (SCV)A Switch Control Value is an integer in the range (0.255) that is used by an MS,either alone or in conjunction with a Terminat
27、ion Address, to control elements of theoperation of certain MSC-based features.Depending on the details of the air interface in use, an SCV may be sent by the MSto the network: As a Switch Control Code (constructed from the SCV) sent using the airinterfaces procedures for sending generic digit strin
28、gs to the network, or Using dedicated air interface specific protocol elements.In either case, the SCV is always represented as an SCC when sent from MSC toMSC within the TIA/EIA-41 network.Depending on the details of the air interface in use, an SCV and associatedtermination address may be sent by
29、the MS to the network: As a Switch Control Code String (with the SCC portion of the SCCSconstructed from the SCV) sent using the air interfaces procedures for sendinggeneric digit strings to the network, or Using dedicated air interface specific protocol elements.In either case, the SCV and associat
30、ed termination address are always represented asan SCCS when sent from MSC to MSC within the TIA/EIA-41 network.AH Stage-1 Feature Description 2 TIA/EIA-664-XXX ModificationsTIA/EIA/IS-837123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960T
31、he following table defines the Switch Control Values used in this Standard:Switch ControlValuesUsage0 Forward the incoming call to a networkstored destination16 Forward the incoming call to the destinationprovided by the mobile in conjunction withthis code.17 Forward the incoming call to voice mail.
32、18 Apply Answer Hold treatment to theincoming call (assuming an incoming call isbeing offered to the MS through Alerting orCall Waiting Notification).Table X: Switch Control Value Assignments1.2 Call Model(TIA/EIA-664-100-B, page 100-1)For the purposes of defining feature operations and interactions
33、 within this Standard,a call model is used. This call model is based on a finite state machine. The finitestate machine is driven by a set of events. These events cause the finite statemachine to perform a set of actions and change the state of the finite state machine.The current call state determi
34、nes how a given event may perform a different set ofactions.The following call states are defined for a mobile subscriber:Note: the omitted existing text is retained without modification.12. Conference Alerting. A variation on the Alerting state for the ConferenceCalling feature.13. Answer Hold. An
35、incoming call has been answered and immediately placedon hold, with the appropriate Answer Hold treatment being applied towardthe calling party. The system is waiting for the controlling subscriber toretrieve the held call. There is no third party.Note: the omitted existing text is retained without
36、modification.The following subscriber (and other party) actions are defined:A. Address: A subscriber presses the SEND key with termination addressdigits.C. Conferee: A conferee requests a disconnect.D. Disconnect: The other party (sometimes a calling party) requests adisconnect.E. End: A subscriber
37、presses the END key.TIA/EIA-664-XXX Modifications 3 AH Stage-1 Feature DescriptionTIA/EIA/IS-837123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960F. Feature: A subscriber enters a Feature Code String followed by the SENDkey.G. callinG: The
38、 calling party sends one or more DTMF digits.H. Held: The held party requests a disconnect.I. Incoming: An incoming call arrives for a subscriber.N. aNswers: The other party answers.P. Period: A time period expires.S. S end: A subscriber presses the SEND key without digits.T. Third: The third party
39、requests a disconnect.U. featUre code: A subscriber enters a Feature Code String, a delimiter digit“#,” and a termination address followed by the SEND keyV. addressed scV: The subscriber instructs the MS to sends an SCV andassociated termination address, to the network.W. sWitch control: The subscri
40、ber instructs the MS to sends an SCV to thenetwork.Note: the omitted existing text is retained without modification.The following tables summarize the feature interactions in a state-action matrix forthe features in this Standard:AH Stage-1 Feature Description 4 TIA/EIA-664-XXX ModificationsTIA/EIA/
41、IS-8371234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859601 2 3 4 5 6 7 8 9 10 11 12 13Action Idle Alerting 2-way Adding on Holding 2-way 3-way 2-way CW notification 2-way CW Conference adding on Conference 2-way Conference ConferenceAlertin
42、g Answer HoldAddress andsendBasic BasicCCCT=3WCCT=3WCCT3WC3WC CW CW CC CC CC CC AHConfereedisconnectN/A CC N/A N/A N/A N/A N/A N/A CC CC CC N/A N/Aother partyDisconnectN/A Basic Basic N/A N/A 3WC CW CW N/A CC N/A CC AHEnd key Basic Basic1 Basic CT=3WCCT3WCCT3WCCW CW CC CC CC CC AHFeature codeand sen
43、dBasicFeatureCCBasicCCBasicCCCCWMWNFeatureCCCCWMWNFeat-ureCT3WC3WC CW CW CC CC CC CC AHcallinG DTMFdigitsN/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/AHelddisconnectN/A Basic N/A CCCT=3WCCT=3WCN/A N/A CW N/A N/A N/A CC N/AI ncoming call Basic Basic BasicCWCCCT=3WCCT=3WC3WC CW CW CC CC CC CC N/A
44、other partyaNswersN/A N/A Basic N/A CT=3WC3WC N/A N/A N/A CC CC CC N/APeriod N/A Basic Basic N/A N/A N/A N/A N/A N/A N/A N/A CC N/ASend and nodigitsBasic BasicCCBasicCCCT=3WCCT=3WCCT3WC3WC CW CW CC CC CC CC AHThirddisconnectN/A N/A N/A N/A CT=3WC3WC CW N/A N/A N/A N/A N/A N/AfeatUre code,termination
45、address andsendBasicCCBasicCCCT=3WCCCCT=3WCCCCT3WC3WC CW CW CC CC CC N/A AHaddressedscVN/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/AsWitch control N/A AH N/A N/A N/A N/A AH N/A N/A N/A N/A N/A AHTable 3: State-Action Matrix to Locate Feature Interactions(Part 1 of 2)1 Some implementations may
46、use the END key to activate Answer Hold.TIA/EIA-664-XXX Modifications 5 AH Stage-1 Feature DescriptionTIA/EIA/IS-837123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960X.1 Answer Hold (AH)(new Chapter for TIA/EIA-664-XXX-B)Answer Hold (AH) p
47、rovides a called subscriber the capability to answer the call, butselectively delay the conversation (e.g., calls in the alerting or Call Waiting state).The incoming call is provided an appropriate network announcement to notify thecalling party to please hold.AH is also applicable to incoming calls
48、 being delivered to called AH authorizedsubscribers as Call Waiting (CW) calls.AH authorized subscribers, with AH active on an incoming call, shall resolve the callin the AH state prior to originating a new outgoing call or call leg.New incoming calls to AH authorized subscribers, with AH active on
49、an incomingcall, shall receive the appropriate busy treatment (e.g., busy tone, redirected to voicemail, etc.) for the called AH subscriber.Applicability to Telecommunications ServicesAH is applicable to voice telecommunications services.X.1.1 Normal Procedures With Successful OutcomeAuthorizationAH may be generally available or may be provided after pre-arrangement with theservice provider.De-AuthorizationAH may be withdrawn at the subscribers r
