1、INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU 1.258.1 (1 0195) INTEGRATED SERVICES DIGITAL NETWORK (ISDN) SERVICE CAPABILITIES TERMINAL PORTABILITY (TP) SUPPLEMENTARY SERVICE ITU-T Recommendation 1.258.1 (Previously ?CCITT Recommendation?) ITU-T RECMN*I-
2、258* I 95 48b2591 ObObI98 649 = FOREWORD The ITU-T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (ITU). The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommen- dations on them with a view to
3、standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendation
4、s by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1 (Helsinki, March 1-12, 1993). ITU-T Recommendation 1.258.1 was prepared by ITU-T Study Group 1 (1993-1996) and was approved under the WTSC Resolution No. 1 procedure on the 3rd of October 1995. NOTE In this
5、Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. O ITU 1996 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanic
6、al, including photocopying and microfilm, without permission in writing from the ITU. ITU-T RECMN*I=258 . I 35 = 4862531 0606349 585 H CONTENTS Definition Description . 2.1 General description . 2.2 Specific terminology . Applicability to telecommunication services 2.3 Procedures 3.1 Provisiodwithdr
7、awal 3.2 Normal procedures . 3.3 Exceptional procedures . Network capabilities for charging 5.1 Interworking with non-ISDNs 5.2 Interworking with private ISDNs . Interaction with other supplementary services . Interworking considerations . 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 6.10 6.11 6.12 6.13 6.14
8、 6.15 6.16 6.17 6.18 6.19 6.20 6.21 6.22 6.23 Advice Of Charge services . Call Hold (HOLD) Call transfer services . Call Waiting (CW) Closed User Group (CUG) . Completion of calls services . Conference services Diversion services . In-cai1 Modification (IM) Direct Dialling-In (DDI) . ISDN Freephone
9、Service (IFS) . Line Hunting (LH) Malicious Call Identification (MCID) Multi-Level Precedence and Preemption (MLPP) Multiple Subscriber Number (MSN) Name identification services . Number identification services . Reverse Charging (REV) Support of Private Numbering Plan (SPNP) . Outgoing Call Barring
10、 (OCB) . Sub-addressing (SUB) Terminal Portability (TP) User-to-User Signalling (WS) SDL description . Pages 1 1 1 1 1 2 2 2 2 3 3 3 3 3 3 4 4 4 4 4 5 5 5 5 5 5 5 6 6 6 6 6 6 6 6 7 7 7 . Recommendation 1.258.1 (10/95) 1 ITU-T RECMN*I*258. I 95 = 4862593 0606350 2T7 Recommendation 1.258.1 TERMINAL PO
11、RTABILITY (TP) SUPPLEMENTARY SERVICE (Geneva, 1995) 1 Definition The terminal Portability (TP) supplementary service allows a user to move a terminal from one socket to another within one given basic access during the active state of a call. It also allows a user to move a call from one terminal to
12、another terminal within one given basic access during the active phase of the call. The portability of a terminal during the idle state is part of the basic access capabilities and does not require any procedure. The portability of a terminal in the call establishment and in the call clearing phases
13、 is not possible. 2 Description 2.1 General description The TP supplementary service applies to the basic access. A user engaged in an active call can suspend communication by an appropriate signalling procedure and resume the call at a later time. This procedure applies independently to calling and
14、 called users. The TP supplementary service allows a user during the active phase of a call: - - to replace one terminal by another compatible terminal at the same socket; to move from one terminal to another compatible terminal within a basic access; to suspend the call and subsequently to resume i
15、t at the same terminal and the same socket; to move a terminal from one socket to another one within a basic access. - - NOTE - In the cases involving physical disconnection and reconnection of terminals, or in moving from one terminal to another one, the user will be responsible for ensuring that c
16、ompatibility with the suspended call is retained. 2.2 Specific terminology Not applicable. 2.3 Applicability to telecommunication services The TP supplementary service applies to some interactive circuit switched telecommunication services requiring the attendance of a human being, such as telephony
17、, videotelephony, etc. The TP supplementary service does not apply to non-interactive services such as facsimile, teletex, mixed-mode, etc. However, the network will not take any actions to restrict its applicability. It is a users responsibility to resume the call with a terminal which is compatibl
18、e both with the remote terminal and with the type of connection previously established. Recommendation 1.258.1 (10/95) 1 3 Procedures 3.1 Provisiodwithdrawal This service shall be either provided by prior arrangement with the service provider or be available on a general basis. Withdrawal shall be a
19、t the request of the customer or for administrative reasons. 3.2 Normai procedures 3.2.1 Activatioddeactivationhegistration Not applicable. 3.2.2 Erasure Not applicable. 3.2.3 Invocation and operation The TP supplementary service shall only be invoked in the active phase of a call. A user wishing to
20、 invoke the TP supplementary service shall suspend the call by sending an appropriate request. This request may contain a call identity limited to two characters. On receipt of this request, the network shall: - store the call identity value if specified (if no call identity is specified the network
21、 shall allocate a null value); - preserve the B-channel involved in the connection until the call is resumed or the time-out expires. This time-out shall be from 2 to 15 minutes; - preserve the connection; and - send an acknowledgement to the controlling user and an indication to the remote user. Th
22、e terminal, upon receiving the acknowledgement, shall inform the user that the user can physically disconnect the terminal. The user can resume the call within the time-out, by sending a request containing the call identity (if any) included in the suspension request. On receipt of the resumption re
23、quest the network shall: - re-establish the call; - NOTE - During an interim period of time, some networks may not support the sending of indications to the remote user. send an acknowledgement to the controlling user and an indication to the remote user. 3.2.4 Interrogation Not applicable. 3.3 Exce
24、ptional procedures 3.3.1 Activatioddeactivationhegistration Not applicable. 3.3.2 Erasure Not applicable. 2 Recommendation 1.258.1 (10/95) 3.3.3 Invocation and operation If the network cannot satisfy the users request to suspend or resume the call, the network shall reject the request and shall send
25、 an appropriate indication to the user. If the controlling user does not resume within the time-out, the network shall release the call. The network shall reject a subsequent resume request with an appropriate indication. If the remote user releases the call while suspended, the network shall reject
26、 a subsequent resume request from the controlling user with an appropriate indication. 3.3.4 Interrogation Not applicable. 4 Network capabilities for charging This Recommendation does not cover charging. Future Recommendations in the D-Series are expected to contain that information. It shall be pos
27、sible to charge the subscriber accurately for the service. 5 Interworking considerations 5.1 Interworking with non-ISDNs The operation of this supplementary service shall not be affected by the nature (i.e. ISDN or non-ISDN) of the far end of the connection. However, in some interworking situations,
28、 the time-out for the release of the suspended call may be shorter than the value implemented in the served users network. that user may not be supported. NOTE - If the distant user is a PSTN user, the notifications about the suspend request or the resume request of the call to 5.2 Interworking with
29、 private ISDNs When a remote user is on a different network from the served user (e.g., one user on a private ISDN and the other user on a public ISDN), indications to the remote user shall be sent to the remote users network for forwarding to the remote user. 6 Interaction with other supplementary
30、services 6.1 Advice Of Charge services While a call is suspended charging information shall not be sent to the user. 6.1.1 Charging information at call set-up time (AOC-S) If the charging rate changes when a call is in the suspended state, the new charging rate shall be given when the call is resume
31、d. 6.1.2 Charging information during the call (AOC-D) At call suspension request, as a network option, the cumulative information (i.e. total charge incurred up to the moment when the call is suspended) can be given. Recommendation 1.258.1 (10195) 3 On resumption of the call, the sending of charging
32、 information shall continue as a network option, the updated cumulative charging information may be given. If the call is cleared while the call is suspended at the calling users access, and if the calling user attempts to resume the call within the timer, then, as a network option, advice of charge
33、 information may be given to that user at the time of the resume attempt. 6.1.3 Charging information at the end of the call (AOC-E) If the call is cleared while the call is suspended at the calling users access, and if the calling user attempts to resume the call within the timer, then, as a network
34、 option, advice of charge information may be given to the user at the time of the resume attempt. 6.2 Call Hold (HOLD) A terminal cannot suspend an active call when a call is held at that terminal. A held call shall not be suspended. 6.3 Call transfer services 6.3.1 Normal Cai1 Transfer (NCT) No imp
35、act, i.e. neither supplementary service shall affect the operation of the other supplementary service. 6.3.2 Explicit Call Transfer (ECT) No impact, i.e. neither supplementary service shall affect the operation of the other supplementary service. 6.4 Call Waiting (CW) No impact, i.e. neither supplem
36、entary service shall affect the operation of the other supplementary service. NOTE-A waiting call is not an active call and therefore cannot be suspended. 6.5 Closed User Group (CUG) No impact, Le. neither supplementary service shall affect the operation of the other supplementary service. 6.6 Compl
37、etion of calls services 6.6.1 Completion of Calls on No Reply (CCNR) No impact, i.e. neither supplementary service shall affect the operation of the other supplementary service. NOTE - In the case of disconnected terminals, Completion of Calls on No Reply (CCNR) recalls shall not be accepted upon ex
38、piry of the CCNR recall timer. 6.6.2 Completion of Calls to Busy Subscriber (CCBS) No impact, Le. neither supplementary service shall affect the operation of the other supplementary service. NOTE - In the case of disconnected terminals, Completion of Calls to Busy Subscriber (CCSS) recalls shall not
39、 be accepted upon expiry of the CCBS recall timer. 4 Recommendation 1.258.1 (10/95) 6.7 Conference services 6.7.1 Conference Calling (CONF) When a terminal manages an add-on conference, the TP supplementary service shall not be available. 6.7.2 Meet-Me Conference (MMC) No impact, i.e. neither supple
40、mentary service shall affect the operation of the other supplementary service. 6.7.3 Preset Conference Calling (PCC) The network shall prevent the served user of the preset conference calling supplementary service from invoking the TP supplementary service. 6.7.4 Three-Party (3PTY) The network shall
41、 prevent the served user of the three party supplementary service from invoking the TP supplementary service. 6.8 Diversion services 6.8.1 Call Deflection (CD) No impact, i.e. neither supplementary service shall affect the operation of the other supplementary service. 6.8.2 Call Forwarding Busy (CFB
42、) No impact, i.e. neither supplementary service shall affect the operation of the other supplementary service. 6.8.3 No impact, i.e. neither supplementary service shall affect the operation of the other supplementary service. 6.8.4 Call Forwarding Unconditional (CFU) No impact, i.e. neither suppleme
43、ntary service shall affect the operation of the other supplementary service. 6.8.5 Selective Call Forwarding (SCF) No impact, i.e. neither supplementary service shall affect the operation of the other supplementary service. Call Forwarding No Reply (CFNR) 6.9 Direct-Dialling-In (DDI) No impact, i.e.
44、 neither supplementary service shall affect the operation of the other supplementary service. 6.10 In-call Modification (IM) No impact, i.e. neither supplementary service shall affect the operation of the other supplementary service. 6.11 ISDN Freephone Service (IFS) No impact, i.e. neither suppleme
45、ntary service shall affect the operation of the other supplementary service. 6.12 Line Hunting (LH) No impact, i.e. neither supplementary service shall affect the operation of the other supplementary service. 6.13 Malicious Call Identification (MCID) The called user cannot invoke the malicious call
46、identification supplementary service for a call which is suspended by the called user. Recommendation 1.258.1 (10/95) 5 If the calling user clears while the call has been suspended by the called user, the called user cannot resume the call and hence cannot invoke the malicious call identification su
47、pplementary service for that call. 6.14 No impact, i.e. neither supplementary service shall affect the operation of the other supplementary service. Multi-Level Precedence and Preemption (MLPP) 6.15 Multiple Subscriber Number (MSN) No impact, i.e. neither supplementary service shall affect the opera
48、tion of the other supplementary service. 6.16 Name identification services 6.16.1 No impact, i.e. neither supplementary service shall affect the operation of the other supplementary service. 6.16.2 No impact, i.e. neither supplementary service shall affect the operation of the other supplementary se
49、rvice. Calling Name Identification Presentation (CNIP) Calling Name Identification Restriction (CNIR) 6.17 Number identification services 6.17.1 No impact, i.e. neither supplementary service shall affect the operation of the other supplementary service. 6.17.2 No impact, i.e. neither supplementary service shall affect the operation of the other supplementary service. 6.17.3 No impact, i.e. neither supplementary service shall affect the operation of the other supplementary service. 6.17.4 No impact, i.e. neither supplementary service shall affect the operation of the othe
