ITU-T I 253 4-1996 Call Completion Supplementary Services Completion of Calls on No Reply - Series I Integrated Services Digital Network Service Capabilities - Supplementary Servic.pdf

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1、- STD-ITU-T RECMN 1.253.4-ENGL L77b 48b2571 Ob21380 04b INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STAN DARD IZATIO N SECT0 R OF ITU 1.253.4 (07/96) SERIES I: INTEGRATED SERVICES DIGITAL NETWORK Service capabilities - Supplementary services in ISDN Call completion supplementary se

2、rvices: Completion of calls on no reply ITU-T Recommendation 1.253-4 (Previously CCIl7 Recommendations) STDnITU-T RECMN 1.253.Y-ENGL 177b m 48b2571 Ob21381 TA2 m GENERALSTRUCTURE Terminology Description of ISDNs General modelling methods Telecommunication network and service attributes General descr

3、iption of asynchronous transfer mode SERVICE CAPABILITIES l Scope General aspects of services in ISDN Common aspects of services in the ISDN Bearer services supported by an ISDN ITU-T - I SERIES RECOMMENDATIONS INTEGRATED SERVICES DIGITAL NETWORK 1.1 00-1.1 99 1.1 10-1.1 19 I .12-I .129 I. 130-1.1 3

4、9 1. 140-1.1 49 I .150-1.199 1.200-1.299 1.200-1.209 1.210-1.219 1.220-1.229 I .230-1.239 Teleservices supported by an ISDN 1.240-1.249 si OVERALL NETWORK ASPECTS AND FUNCTIONS 1.300-1.399 Network functional principles 1.31 0-1.31 9 Reference models I .32O-l.329 Numbering, addressing and routing 1.3

5、30-1.339 Performance objectives I .35O-l.359 Protocol layer requirements I .36O-l.369 I .370-1.399 ISDN USER-NETWORK INTERFACES I .40O-l.499 Application of I-series Recommendations to ISDN user-network interfaces I .420-1.429 Layer 1 Recommendations I .43O-l.439 Layer 3 Recommendations 1.450-1.459 M

6、ultiplexing, rate adaption and support of existing interfaces I .46O-l.469 I .470-1.499 INTERNETWORK INTERFACES 1.500-1.599 MAINTENANCE PRINCIPLES 1.600-1.699 B-ISDN EQUIPMENT ASPECTS 1.700-1.799 Connection types 1.340-1.349 General network requirements and functions Layer 2 Recommendations 1.440-1.

7、449 Aspects of ISDN affecting terminal requirements ATM equipment I .730-1.749 Management of ATM equipment I .750-1.799 For further details, please rejr to ITU-T List of Recommendations STD-ITU-T RECMN 1.253.4-ENGL 177b 48b2571 Ob21382 919 ITU-T RECOMMENDATION 1.253.4 CALL COMPLETION SUPPLEMENTARY S

8、ERVICES: COMPLETION OF CALLS ON NO REPLY Summary Completion of Calls on No Reply (CCNR) is an ISDN supplementary service offered to the calling user. The CCNR supplementary service enables the calling user A, upon encountering destination B, which does not answer the call (no reply), to be notified

9、when destination B becomes free after having terminated an activity. If user A desires, then the network will reinitiate the call to the specified destination B. Source ITU-T Recommendation 1.253.4 was prepared by ITU-T Study Group 1 (1993-1996) and was approved under the WTSC Resolution No 1 proced

10、ure on the 19th of July 1996. STD*ITU-T RECMN 1-253.4-ENGL 177b = 48b2591 Ob21383 855 9 FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (IT-T) is a permanent organ of th

11、e ITU. Some 179 member countries, 84 telecom operating entities, 145 scientific and industrial organizations and 38 international organizations participate in ITU-T which is the body which sets world telecommunications standards (Recommendations). The approval of Recommendations by the Members of IT

12、U-T is covered by the procedure laid down in WTSC Resolution No. 1 (Helsinki, 1993). In addition, the World Telecommunication Standardization Conference (WTSC), which meets every four years, approves Recommendations submitted to it and establishes the study programme for the following period. In som

13、e areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognize

14、d 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 mechanical, including photocopying and microfilm, without permission in writing from the ITU. 11 Recommendation 1.253.4 (07/96) CONTENTS Page 1 Def

15、inition 2 2.1 Description . General descnption., . 1 2.2 Specific terminology 1 2.3 Qualifications on the applicability to telecommunication services 2 2 2 3 3 4 4 5 5 5 6 6 8 8 8 8 3 3.1 Procedures Provisiodwithdrawal 3.2 Normal procedures . 3.2.1 Activatioddeactivatiodregistration 3.2.2 Erasure .

16、3.2.3 Invocation and operation . 3.2.4 Interrogation 3.3 Exceptional procedures . 3.3.1 Activatioddeactivatiodregistration 3.3.2 Erasure . 3.3.3 Invocation and operation. 3.3.4 Interrogation Alternate procedures . 3.4.2 Invocation and operation . 3.4.1 Activatioddeactivatiodregistration 3.4 4 5 5.1

17、5.2 6 6.1 Network capabilities for charging 8 Interworking considerations . 8 Interworking with non-ISDNs 8 8 Interworking with private ISDNs . Interaction with other supplementary services . Advice of charge services . Charging information during the call (AOC-D) Call hold (HOLD) . 6.1.1 6.1.2 6.1.

18、3 Charging information at call Set-up time (AOC-S) . Charging infomation at the end of the call (AOC-E) . 6.2 6.3 9 Call transfer services 6.3.1 Normal Call Transfer (NCT) . 6.3.2 Explicit Call Transfer (ECT) . Call Waiting (CW) . Closed User Group (CUG) . 6.4 6.5 10 Recommendation 1.253.4 (07/96) .

19、 111 . STD-ITU-T RECMN 1.253-LI-ENGL 177b m qBb257L Ob21385 b28 m 6.6 6.7 6.8 6.9 6.10 6.1 1 6.12 6.13 6.14 6.15 6.16 6.17 6.18 6.19 6.20 6.21 6.22 6.23 7 Completion of calls services . 6.6.1 Completion of Calls on No Reply (CCNR) 6.6.2 Completion of Calls to Busy Subscriber (CCBS) . conference serv

20、ices 6.7.1 Conference calling (CONF) 6.7.2 Meet-Me Conference (MMC) . 6.7.3 Preset Conference Calling (PCC) 6.7.4 Three-Paxty Service (3PT y) Diversion services . 6.8.1 Call Deflection (CD) . 6.8.2 Call Forwarding Busy (CFB) 6.8.3 Call Forwarding No Reply (CFNR) 6.8.4 Call Forwarding Unconditional (

21、CFU) . 6.8.5 Selective Call Forwarding (SCF) Direct-Dialling-In (DDI) In-call modification (IM) ISDN Freephone Service (IFS) . Line Hunting (LH) Malicious Call Identification (MCID) Multi-Level Precedence and Preemption (MLPP) . Multiple Subscriber Number (MSN) Name identification services 6.16.1 Ca

22、lling Name identification Presentation (CNIP) . 6.16.2 Calling Name Identification Restriction (CNIR) Number identification services . 6.17.1 Calling Line Identification Presentation (CLIP) . 6.17.2 Calling Line Identification Restriction (CLIR) . 6.17.3 Connected Line Identification Presentation (C

23、OLP) 6.17.4 Connected Line Identification Restriction (COLR) Outgoing Call Barring (OCB) Reverse charging (REV) . Sub-addressing (SUB) Support of Private Numbering Plan (SPNP) Terminal Portability (TP) . SDL description User-to-User Signalling (UUS) Page 10 10 10 11 11 11 11 11 11 11 11 12 12 13 13

24、13 13 13 13 13 14 14 14 14 14 14 14 14 14 14 15 15 15 15 15 15 iv Recommendation 1.253.4 (07/96) . Recommendation 1.253.4 CALL COMPLETION SUPPLEMENTARY SERVICES: COMPLETION OF CALLS ON NO REPLY (Geneva, 1996) 1 Definition completion of Calls on No Reply (CCNR) enables a calling user A, encountering

25、a destination B, which does not answer the call (no reply), to be notified when the destination B becomes free after having terminated an activity, and to have the network reinitiate the call to the specified destination B if user A desires. 2 Description 2.1 General description The CCNR supplementa

26、ry service is applicable to users who are connected to the network via a basic access or a primary rate access. When user A encounters a destination B, which does not answer the call (no reply), user A may request CCNR on destination B. When user A requests the CCNR supplementary service, the networ

27、k will monitor for destination Bs becoming free after having terminated an activity. When destination B becomes free after having terminated an activity, the network will wait a short time (as defined by the destination B idle guard timer) in order to allow the resources to be reused for originating

28、 a call. If resources are not reused by destination B within this time, then the network will automatically recall user A. When user A accepts the CCNR recall, then the network will automatically generate a CCNR call to destination B. 2.2 Specific terminology For the purposes of this Recommendation,

29、 the following definitions apply. 2.2.1 user A: The user who originated the call and to whom the CCNR supplementary service is provided. 2.2.2 destination 3: The entity that was addressed in the original call set-up. 2.2.3 CCNR request: An instance of an activation of the CCNR supplementary service

30、which is held in a queue pending the correct conditions for the CCNR supplementary service to be completed. 2.2.4 CCNR recall: A network to user indication, informing user A that the network is ready to initiate a CCNR call to destination B and that the network is awaiting a response to this indicat

31、ion. 2.2.5 CCNR call: Call set-up by the network from user A to destination B resulting from user As acceptance of a CCNR recall. 2.2.6 busy: See clause 3A.22 1. 2.2.7 free: Destination B is free when it is neither busy nor channels busy. Recommendation 1.253.4 (07/96) I STD-ITU-T RECMN 1-253.9-ENGL

32、 L77L I 48b2571 Ob21387 4TO = 2.2.8 CCNR busy: Any one of the following conditions will cause user A to be considered as CCNR busy: - maximum number of calls reached at user A; - no B-channels available at user A; - CCNR recall pending on user A. 2.29 retention timer: This timer specifies the amount

33、 of time the network retains all of the information supplied by the calling user if the call is terminated while destination B is being informed of the call. Although this timer is optional for the basic call procedures it is needed for the operation of the CCNR supplementary service. The minimum va

34、lue of the timer shall be 15 seconds. 2.2.10 CCNR service duration timer: This timer specifies the maximum time the CCNR supplementary service will remain active for user A within the network. The value of this timer is a network option, typically 60-1 80 minutes. 2.2.11 CCNR recall timer: This time

35、r specifies the maximum time the network shall wait for a user A response to a CCNR recall. The value of this timer is between 10 and 20 seconds. 2.2.12 destination B idle guard timer: This timer specifies the amount of time the network will delay after destination B has become free, after having te

36、rminated an activity, before informing user A. The value of this timer is between O and 15 seconds. 2.2.13 compatible terminal: A terminal which can support the bearer service or teleservice requested for the original call to destination B and which can accept calls to the ISDN number and subaddress

37、 identifiing the called user in the original call to destination B. 2.2.14 activity: Answering an incoming call or originating an outgoing call. 2.3 The CCNR supplementary service may be applicable to all circuit-mode bearer services defined in Recommendation 1.230, and all teleservices defined in R

38、ecommendation 1.240 with the following exceptions: a) b) Qualifications on the applicability to telecommunication services call 2 of the videotelephony teleservice (see Recommendation F.72 1); all other circuit-switched telecommunications services requiring the use of more than one B- channel. 3 Pro

39、cedures 3.1 Provision/withdrawal The CCNR supplementary service may be provided to user A after prior arrangement with the service provider or may be generally available. The CCNR supplementary service shall be withdrawn by the service provider upon request of the subscriber or for service provider

40、reasons. As a service provider option, the CCNR supplementary service can be offered with a subscription option which may apply to the whole access of the user A. The subscription option is detailed in Table 1. 2 Recommendation 1.253.4 (07/96) STD-ITU-T RECMN 1.253-q-ENGL 199b 48b259L Ob21388 337 D

41、TABLE 1I.253.4 I Values I 1 Subscription option Recall mode - CCNR recall offered to all terminals on the access - CCNR recall offered to the terminal that has activated the CCNR supplementary service If the subscription option is not offered, one of the two values shall be chosen by the service pro

42、vider. As a network option, the presence of compatible terminals at the destination may be verified. 3.2 Normal procedures 3.2.1 Activation/deactivation/registration 3.2.1.1 Activation When user A encounters a destination B, which does not answer the call (no reply) and the CCNR supplementary servic

43、e can be requested against this destination, the network shall retain the call information. User A can activate the CCNR supplementary service while the called user is being informed of the call and after the call is terminated before the retention timer is expired. Upon receipt of a request for the

44、 activation of the CCNR supplementary service, the network shall stop informing destination B of the call and shall store the identification of the destination contained in the original call request. User A shall be informed that the activation was successful. Multiple requests against destination B

45、 shall be queued. When the activation of the CCNR supplementary service is accepted, the CCNR service duration timer is started. The network shall monitor for destination Bs becoming free after having terminated an activity. User A can have a limited number of CCNR requests outstanding. This limit i

46、s a service provider option with a maximum value of five. The requests can be to different destinations, or can be to the same destination with different service requirements (e.g. bearer service or teleservice requirements) or as a service provider option with the same service requirements. Destina

47、tion B can have a limited number of incoming CCNR requests outstanding. This limit is a service provider option with a maximum value of five. Having activated the CCNR supplementary service, user A can originate calls and receive calls as normal. 3.2.1.2 Deactivation The following deactivation reque

48、sts shall be made available to user A: 1) 2) Upon successful deactivation, the corresponding CCNR request shall be discarded. User A shall be informed that the deactivation has been successful. If a specific CCNR request is deactivated, the network may indicate which specific CCNR request has been d

49、eactivated. deactivate a specific user A CCNR request. This request may contain enough information to correlate with the initial activation; deactivate all outstanding CCNR requests. Recommendation 1.253.4 (07/96) 3 STD-ITU-T RECMN 1.253-4-ENGL L77b M 4Bb2571 Ob21387 273 m If the recall mode is “CCNR recall offered to all terminals“, then user A can deactivate any outstanding CCNR requests stored for that user from any of the user As terminals. If the recall mode is “CCNR recall offered to the terminal which has activated the CCNR supplementary service“, then user