1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU INTEGRATED SERVICES DIGITAL NETWORK (ISDN) SERVICE CAPABILITIES 1.257.1 (1 0/95) USER-TO-USER SIGNALLING (UUS) ITU=T Recommendation 1.257.1 (Previously ?CCITT Recornmendation?) FOREWORD The ITU-T (Telecommuni
2、cation 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 standardizing telecommunications on a worldwide basis. The Worl
3、d Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the -T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid dow
4、n in WTSC Resolution No. 1 (Helsinki, March 1-12, 1993). ITU-T Recommendation 1.257.1 was revised 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 Recommendation, the expression “Administration” is used for concis
5、eness 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 mechanical, including photocopying and microfilm, without permission in wr
6、iting from the IT. ITU-T RECMNUI.257. 1 95 m 48b2571 Ob08230 174 m CONTENTS Definition . Description . 2.1 General description . 2.2 Specific terminology . 2.3 Qualification of the applicability to telecommunication services . Procedures 3.1 Provision/withdrawal 3.2 Normal procedures 3.3 Exceptional
7、 procedures . Network capabilities for charging 3.4 Alternative procedures Interworking requirements . Interaction with other supplementary services . 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 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
8、) Call transfer services . Call Waiting (CW) Closed User Group (CUG) . Completion of calls services . Conference services Diversion services . In-call-Modification (IM) . Direct-Dialling-In (DDI) ISDN freephone Service (IFS) Line Hunting (LH) Malicious Call Identification (MCID) Multi-Level Preceden
9、ce and Preemption (MLPP) Name identification services . Number identification services . Outgoing Call Barring (OCB) . Reverse Charging (REV) Sub-addressing (SUB) Support of Private Numbering Plans (SPNP) . User-to-User signalling . Multiple Subscriber Number (MSN) Terminal Portability (Tp) Dynamic
10、description Annex A . Interaction between User-to-User Signalling and call diversion services Page 1 1 1 2 2 3 3 3 5 5 6 6 6 6 6 6 7 7 7 7 8 8 9 9 9 9 9 9 9 9 9 9 10 10 10 10 10 14 Recommendation 1.257.1 (10/95) 1 ITU-T RECMNJI.257- 3 95 4862593 Ob08233 000 = Recommendation 1.257.1 USER-TO-USER SIGN
11、ALLING (UUS) (revised 1995) 1 Definition The user-to-user (UUS) supplementary service allows an ISDN user to sendreceive a limited amount of information to/from another ISDN user over the signalling channel in association with a call to the other ISDN user. NOTE - These procedures are applicable to
12、User-to-User Information (WI) transfer in association with a circuit-switched telecommunication service only. Procedures to permit UUI transfer in association with other types of calls (e.g. packet bearer services) need to be investigated. 2 Description 2.1 General description The WS supplementary s
13、ervice is applicable to users who are connected to a network via a basic access or a primary rate access. The UUS supplementary service allows the user to sendreceive a limited amount of user-generated information to/from another user-network interface. This information is passed transparently (Le.
14、without modification of contents) through the network. Normally, the network will not interpret or act upon this information. The user can transfer UUI in different phases of the call depending on the service) to which the user subscribes. These services are: - Service I UUI can be sent and received
15、 during the origination and termination of calls. In the case of a point-to-multipoint configuration at the called user, the following restrictions shall apply to the transfer of UUI: in the forward direction, UUI can be sent by the calling user only as part of the request for the origination of a c
16、all, or as part of the request to terminate the call. If the calling user terminates the call prior to the connection being established, UUI shall only be delivered to those terminals which have indicated that the user has been informed of the call; in the backward direction, UUI can be sent from th
17、e called user to the calling user with the indication that the called user is being informed of the call. It shall be the called users responsibility to avoid contention. UUI can also be sent from the called user when answering the call; if the called user rejects the call and the network receives a
18、 single rejection from the called user, then the reason for rejection and the accompanying UI (if any) shall be sent to the calling user; if the network receives multiple rejections from the called user, with the same of differing reasons for rejection, then the network shall select the first receiv
19、ed, highest priority rejection, based on the reason(s) for rejection. The reason for rejection and the accompanying UUI (if any) of the selected rejection shall be sent to the calling user. - Service2 UUI can be sent and received after the calling user has received an indication that the called user
20、 is being informed of the call and prior to the establishment of the connection. UUI sent by the calling user prior to receiving the acceptance of the call by the called user shall, as a service provider option, be delivered to the called user after the call has been established. Service is only app
21、licable if a point-to-point configuration exists at the called users side. Recommendation 1.257.1 (10/95) ITU-T REClN*I-257. L 95 48b259L Ob08232 T47 - Service3 UUI can be sent and received only while the connection is established. Service 1, service 2 and service 3 allow the transmission of 128 oct
22、ets per message. of I on service 1. NOTE - During an interim period of time, some service providers may support the transfer of only 32 octets Limitations are also placed on the number of messages per time for service 3. The flow control of each direction shall operate independently. 2.2 Specific te
23、rminology 2.2.1 user-to-user information (UUI): The information transferred by the service WS. 2.2.2 point-to-point arrangement: A situation where multiple responses to an incoming call cannot occur. 2.2.3 point-to-multipoint arrangement: A situation where multiple responses to an incoming call can
24、occur. 2.2.4 the WS supplementary service. served user: The user to whom the UUS supplementary service is provided and who requests the activation of 2.2.5 remote user: The user who receives a request for activation of the UUS supplementary service. 2.2.6 the activation of the UUS supplementary serv
25、ice. explicit request: The UUS supplementary service is considered as explicitly requested when a user requests 2.2.7 request for the UUS supplementary service is made and UUI is sent by the user when originating a call. implicit request: The UUS supplementary service is considered as implicitly req
26、uested when no explicit 2.2.8 UUS supplementary service cannot be accepted. “S not required request: A request where originating a call shall continue even if the request for the 2.2.9 supplementary cannot be accepted. “UUS required” request: A request where originating a call shall be rejected if t
27、he request for the UUS 2.2.10 basic access: See Recommendation Q.9, definition 155 1. 2.2.11 called user: The user who received an incoming call (originated by the calling user). 2.2.12 ding user: The user who originates, or originated, the call. 2.2.13 integrated services digital network (ISDN): Se
28、e 2.3A.112, definition 308. 2.2.14 origination and termination of calls. service 1: A form of the UUS supplementary service where UUI can be sent and received during the 2.2.15 service 2: A form of the UUS supplementary service where UUI can be sent and received after the calling user has received a
29、n indication that the called user is being informed of the call and prior to the establishment of the connection. 2.2.16 connection is established. service 3: A form of the UUS supplementary service where UUI can be sent and received only while the 2.2.17 supplementary service: See 2.4A.210. 2.3 Qua
30、lification of the applicability to telecommunication services Restrictions can only be identified for telecommunication services which are based on the X.31 packet mode bearer services and their future enhancement. 2 Recommendation 1.257.1 (10/95) 3 Procedures 3.1 Provisiodwithdrawal The UUS supplem
31、entary service shall be provided to the user after prior arrangement with the service provider, No subscription is required for the remote user. As a service provider option, one or any combination of the following can be provided: - - service2; - service 3. service 1 implicit request, or service 1
32、implicit request together with service 1 explicit request: The US supplementary service shall be withdrawn by the service provider upon request of the subscriber or for service provider reasons. As a service provider option, withdrawal can be done separately per service provided, or globally for all
33、 services provided to the served user. 3.2 Normal procedures 3.2.1 Activatioddeactivatiodregistration The US supplementary service is activated when: - - it is implicitly requested (for service 1); or it is explicitly requested (for service 1, service 2 and service 3) and accepted by the remote user
34、. Depending on the served users subscription to the UUS supplementary service and the provision of the UUS supplementary service by the service provider, service 1 implicit, service 1 explicit, service 2 and service 3 can be activated individually or in combination. Service 1 implicit and service 1
35、explicit cannot be simultaneously active. Once a service is activated (i.e. service I and/or service 2 and/or service 3) the network shall accept UI from either user in the call, according to the service that has been activated. The S supplementary service requires no registration. 3.2.1.1 Service 1
36、 Service 1 shall be requested by the calling user when originating a call, if UI transfer is desired in either direction. Service 1 can be activated by means of an implicit request or an explicit request. Service 1 is implicitly requested when UUI is included when originating a call. The served user
37、 shall be given an explicit response (acceptance or rejection) to an explicit request. An explicit request can include UUI. When service 1 is explicitly requested, the network shall inform the remote user of the request. The network shall interrogate for the availability of the WS supplementary serv
38、ice of the remote user. No response from the remote user shall be taken by the network as a rejection of the request for the UUS supplementary service. The network shall explicitly indicate to the served user whether or not the requested service has been successfully activated. When service 1 is exp
39、licitly requested, the remote user can include UI when accepting the request for the UUS supplementary service. When service 1 is implicitly requested, service 1 is active for the call, i.e. the remote user is not required to send a response to the implicit request. However, the remote user can incl
40、ude UI in the call response (e.g. for user-to-user negotiation). Service 1 is automatically deactivated when the call is terminated. 3.2.1.2 Service 2 Service 2 shall be requested by the calling user when originating a call, if UI transfer is desired in either direction. Service 2 shall be explicitl
41、y requested. The served user shall be given an explicit response (acceptance or rejection) to an explicit request. Recommendation 1.257.1 (10/95) 3 ITU-T RECMN*I=257- L 95 4862593 Ob08234 8LT D For service 2 the network shall confirm the request for the UUS supplementary service. This confirmation s
42、hall be preceded by an end-to-end check by the network for service availability. The network shall interrogate for the availability of the UUS supplementary service of the remote user. The absence of a response from the remote user shall be taken by the network as a rejection of the request for the
43、UUS supplementary service. The network shall explicitly indicate to the served user whether or not the requested service has been successfully activated. Service 2 is automatically deactivated when the called user is no longer being informed of the call. 3.2.1.3 Semce 3 The calling user can request
44、the activation of service 3 when a call is originated or after the connection has been established. As a service provider option, the called user can request the activation of service 3 after the connection has been established. The calling user shall accept this request for the UUS supplementary se
45、rvice from the called user in order to activate the UUS supplementary service. NOTE - Depending on the network connection selected when originating a call, the request for service 3 while the call is being originated or when the call has been established may fail. Service 3 shall be explicitly reque
46、sted. The served user shall be given an explicit response (acceptance or rejection) to an explicit request. For service 3 the network shall confirm the request for the WS supplementary service. This confirmation shall be preceded by an end-to-end check by the network for service availability. The ne
47、twork shall interrogate for the availability of the WS supplementary service of the remote user. No response from the remote user shall be taken by the network as a rejection of the request for the WS supplementary service. The network shall explicitly indicate to the served user whether or not the
48、requested service has been successfully activated. Service 3 is automatically deactivated when the call is no longer established. 3.2.1.4 “UUS required” request When a call is originated, the calling user can specify whether the requested service) is(are) required for the call, i.e. if the call shal
49、l be completed or not, if UUI cannot be passed. If the “UUS required” request is given by the user, then the call shall not be completed if UUI cannot be passed to the remote user. If the “UUS not required” request is given by the user the call shall be completed even if I cannot be passed. If service 1 is implicitly requested or if service 3 is requested during the call, it cannot be requested as “UUS required”. 3.2.2 Invocation and operation The UUS supplementary service shall be invoked when UUI is sent by the user to the network. When a user send
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