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TECHNICAL SPECIFICATION
Digital cellular telecommunications system (Phase 2+) (GSM);
Universal Mobile Telecommunications System (UMTS);
LTE;
Communication Waiting (CW) using IP Multimedia (IM)
Core Network (CN) subsystem;
Protocol Specification
(3GPP TS 24.615 version 15.0.0 Release 15)
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3GPP TS 24.615 version 15.0.0 Release 15 1 ETSI TS 124 615 V15.0.0 (2018-07)
Reference
RTS/TSGC-0124615vf00
Keywords
GSM,LTE,UMTS
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ETSI
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3GPP TS 24.615 version 15.0.0 Release 15 2 ETSI TS 124 615 V15.0.0 (2018-07)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Trademarks
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ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
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Foreword
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
.
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI
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3GPP TS 24.615 version 15.0.0 Release 15 3 ETSI TS 124 615 V15.0.0 (2018-07)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 5
1 Scope . 6
2 References . 6
3 Definitions and abbreviations . 7
3.1 Definitions . 7
3.2 Abbreviations . 7
4 Communication Waiting (CW) . 8
4.1 Introduction . 8
4.2 Description . 8
4.2.1 General description . 8
4.3 Operational requirements . 8
4.3.1 Provision/withdrawal . 8
4.4 Coding requirements . 9
4.4.1 CW indication . 9
4.4.2 CW notification . 9
4.5 Signalling requirements . 9
4.5.1 General . 9
4.5.2 Activation/deactivation . 9
4.5.3 Registration/erasure . 9
4.5.4 Interrogation . 9
4.5.5 Invocation and operation . 10
4.5.5.1 Actions at the UE of user C . 10
4.5.5.2 Actions at the AS of user B . 10
4.5.5.2.1 General . 10
4.5.5.2.2 AS supporting the network based CW . 10
4.5.5.2.3 AS supporting the terminal based CW . 11
4.5.5.3 Actions at the UE of user B . 11
4.5.5.3.1 General . 11
4.5.5.3.2 Communication waiting presentation procedures . 11
4.5.5.3.3 User B actions during communication waiting condition . 12
4.5.5.3.4 Communication release during a communication waiting condition . 12
4.6 Interaction with other services . 13
4.6.1 Communication Waiting (CW) . 13
4.6.2 Communication Hold (HOLD) . 13
4.6.3 Terminating Identification Presentation (TIP) . 13
4.6.4 Terminating Identification Restriction (TIR) . 13
4.6.5 Originating identification presentation (OIP) . 13
4.6.6 Originating identification restriction (OIR) . 13
4.6.7 Conference calling (CONF) . 13
4.6.8 Communication diversion services (CDIV) . 13
4.6.8.1 Communication forwarding unconditional (CFU) . 13
4.6.8.2 Communication forwarding busy (CFB) . 13
4.6.8.3 Communication forwarding no reply (CFNR) . 13
4.6.8.4 Communication forwarding on Not Logged-in (CFNL) . 14
4.6.8.5 Communication deflection (CD) . 14
4.6.9 Advice of charge (AOC) . 14
4.6.10 Completion of calls to busy subscriber (CCBS) Completion of Communications by No Reply
(CCNR) . 14
4.6.11 Malicious communication identification (MCID) . 14
4.6.12 Anonymous Communication Rejection and Communication Barring (ACR/CB) . 14
4.6.13 Explicit Communication Transfer (ECT) . 14
ETSI
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3GPP TS 24.615 version 15.0.0 Release 15 4 ETSI TS 124 615 V15.0.0 (2018-07)
4.6.14 Message Waiting Indication (MWI) . 14
4.6.15 Flexible Alerting (FA) . 14
4.6.16 Customized Alerting Tones (CAT) . 14
4.6.17 Enhanced Calling Name (eCNAM) . 14
4.7 Parameter values (timers) . 14
4.8 Service Configuration . 15
4.8.1 General . 15
4.8.2 Data Semantics . 15
4.8.3 XML Schema . 15
5 Extensions within the present document . 15
5.1 CW information XML body . 15
5.1.1 General . 15
5.1.2 MIME type definition . 15
5.1.2.1 Introduction . 15
5.1.2.2 Operation . 16
Annex A (informative): Signalling flows . 17
A.1 Network based CW flows. 17
A.2 Terminal based CW flows . 20
A.2.1 Successful communication establishment . 20
A.2.2 Timer expires . 22
Annex B (informative): Example of Filter Criteria . 24
Annex C (informative): IANA Registration templates . 25
C.1 IANA registry for Application Media Types . 25
C.1.1 IANA Registration template for application/vnd.3gpp.cw+xml . 25
Annex D (informative): Change history . 26
History . 29
ETSI
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3GPP TS 24.615 version 15.0.0 Release 15 5 ETSI TS 124 615 V15.0.0 (2018-07)
Foreword
rd
This Technical Specification has been produced by the 3 Generation Partnership Project (3GPP).
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.
ETSI
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3GPP TS 24.615 version 15.0.0 Release 15 6 ETSI TS 124 615 V15.0.0 (2018-07)
1 Scope
The present document specifies the stage 3, Protocol Description of the Communication Waiting (CW) service, based
on stage 1 and stage 2 of the ISDN call waiting supplementary services. It provides the protocol details in the IP
Multimedia (IM) Core Network (CN) subsystem based on the Session Initiation Protocol (SIP) and the Session
Description Protocol (SDP).
The Communication Waiting (CW) service enables a user to be informed, that very limited resources are available for
an incoming communication. The user then has the choice of accepting, rejecting or ignoring the waiting call (as per
basic call procedures).
The present document is applicable to User Equipment (UE) and Application Servers (AS) which are intended to
support the CW supplementary service.
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
- References are either specific (identified by date of publication, edition number, version number, etc.) or
non-specific.
- For a specific reference, subsequent revisions do not apply.
- For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including
a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same
Release as the present document.
[1] 3GPP TS 22.173: "IP Multimedia Core Network Subsystem (IMS) Multimedia Telephony Service
and supplementary services; Stage 1".
[2] 3GPP TS 24.229: "Internet Protocol (IP) multimedia call control protocol based on Session
Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3".
[3] Void.
[4] 3GPP TS 24.628: "Common Basic Communication procedures using IP Multimedia (IM) Core
Network (CN) subsystem; Protocol specification".
[5] 3GPP TS 24.610: "Communication HOLD (HOLD) using IP Multimedia (IM) Core Network (CN)
subsystem; Protocol specification".
[6] 3GPP TS 22.228: "Service requirements for the Internet Protocol (IP) multimedia core network
subsystem (IMS); Stage 1".
[7] 3GPP TS 24.623: "Extensible Markup Language (XML) Configuration Access Protocol (XCAP)
over the Ut interface for Manipulating Supplementary Services".
[8] RFC 7462 (March 2015): "URNs for the Alert-Info Header Field of the Session Initiation Protocol
(SIP)".
[9] RFC 5621 (September 2009): "Message Body Handling in the Session Initiation Protocol (SIP)".
[10] 3GPP TS 24.238: "Session Initiation Protocol (SIP) based user configuration".
[11] RFC 6432:(November 2011) "Carrying Q.850 Codes in Reason Header Fields in SIP (Session
Initiation Protocol) Responses".
[12] RFC 3326 (December 2002): "The Reason Header Field for the Session Initiation Protocol (SIP)".
[13] RFC 3023 (January 2001): "XML Media Types".
[14] RFC 7044 (February 2014): "An Extension to the Session Initiation Protocol (SIP) for Request
History Info".
ETSI
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3GPP TS 24.615 version 15.0.0 Release 15 7 ETSI TS 124 615 V15.0.0 (2018-07)
[15] RFC 3261 (June 2002): "SIP: Session Initiation Protocol".
[16] RFC 3459 (January 2003): "Critical Content Multi-purpose Internet Mail Extensions (MIME)
Parameter".
3 Definitions and abbreviations
3.1 Definitions
For definitions used in this document see:
- 3GPP TS 22.173 [1]
User B: User B is the user who reacts to the communication waiting at subscriber B. User B is the served user for the
communication waiting service.
User C: User C is the user who has originated a communication to subscriber B which causes the CW supplementary
service to be invoked.
User A: User A is a user (several such users may exist) who is engaged in a communication with User B (this
communication can be in any state).
Network determined user busy: See 3GPP TS 22.173 [1] Annex Da.
Approaching Network determined user busy: See 3GPP TS 22.173 [1] Annex Da.
User determined user busy: See 3GPP TS 22.228 [6].
Network based CW: CW when the network detects the CW condition and informs the UE about the conditon.
Terminal based CW: CW when the UE detects the CW condition and informs the network about the condition.
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
AoC Advice of Charge
CAT Customized Alerting Tones
CCBS Completion of Communication sessions to Busy Subscriber
CD Communication Deflection
CDIV Communication Diversion
CFB Communication Forwarding Busy
CFNL Communication Forwarding on Not Logged-in
CFNR Communication Forwarding No Reply
CFU Communication Forwarding Unconditional
FA Flexible Alerting
OIP Originating Identification Presentation
OIR Originating Identification Restriction
TIP Terminating Identification Presentation
TIR Terminating Identification Restriction
CW Communication Waiting
GRUU Globally Routable User agent URI
HOLD Communication Hold
IFC Initial Filter Criteria
IMS IP Multimedia Subsystem
IP Internet Protocol
ISDN Integrated Services Digital Network
MCID Malicious Communication Identification
NDUB Network Determined User Busy
SIP Session Initiation Protocol
UDUB User Determined User Busy
ETSI
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3GPP TS 24.615 version 15.0.0 Release 15 8 ETSI TS 124 615 V15.0.0 (2018-07)
UE User Equipment
4 Communication Waiting (CW)
4.1 Introduction
The Communication Waiting (CW) service enables a UE to be informed that no resources are available for an incoming
communication. The user then has the choice of accepting, rejecting or ignoring the incoming communication (as per
basic communication procedures).
4.2 Description
4.2.1 General description
Two cases can occur depending on the network's ability to validate the status of the destination user upon receipt of an
incoming communication and where the CW condition is determined (i.e. "approaching NDUB" condition):
- network based CW, i.e. sufficient information on the user is available at the time a communication is to be
delivered to the user, the network validates the status of this user. If the status of the user is "approaching
NDUB", the network presents the waiting communication to the destination user; or
- terminal based CW, the network may be informed of the communication waiting situation upon receipt from the
destination user of a communication waiting indication (i.e. the CW condition is determined by the UE using
UDUB).
When a communication arrives at the destination user, the UE validates the status of the user. If the user is already
involved in one or more communications, the terminal notifies the served user of a communication waiting situation.
The user then has different possibilities to react, for example if it may decide to free some resources and accept the
incoming communication.
NOTE: The procedures for NDUB are out of scope of this specification. Information for the handling of NDUB
can be found in 3GPP TS 22.173 [1] Annex Da and 3GPP TS 24.628 [4] clause B.2.
4.3 Operational requirements
4.3.1 Provision/withdrawal
The Communication Waiting service shall be provided after prior arrangement with the service provider.
The CW service can as a network option, be offered to the corresponding users with a subscription option. This
subscription option is part of the CW profile of the served user. The subscription option is shown in the table 4.3.1.1.
Table 4.3.1.1: Subscription option for CW
Subscription option Value
Served user subscribes to "calling user No (default)
receives notification that his/her ________________________
communication is waiting" Yes (NOTE)
NOTE: The notification can take the form of an announcement played to user C, or an out-of
band notification or both. This is up to the network operator to decide.
Timer T is a service provider option. This optional timer specifies the period the network will wait for a response
AS-CW
(answer), from user B, to the offered communication from user C. The timer value is specified in subclause 4.7.
NOTE: When used, the value of T is set by the service provider as a default value subject to change only by
AS-CW
the service provider.
ETSI
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3GPP TS 24.615 version 15.0.0 Release 15 9 ETSI TS 124 615 V15.0.0 (2018-07)
4.4 Coding requirements
4.4.1 CW indication
The XML schema for the CW information XML body is defined in table 4.4.1.1.
Table 4.4.1.1: IM CN subsystem CW XML body, XML Schema
xmlns:cw10="urn:3gpp:ns:cw:1.0"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified" attributeFormDefault="unqualified">
type="cw10:tEmptyType"/>
The CW XML schema shall be transported as a SIP MIME body. The MIME type for the CW information is
"application/vnd.3gpp.cw+xml" (see subclause 5.1). Any SIP message that transports a body with CW information shall
identify the payload as the MIME type associated with CW information (see subclause 5.1).
4.4.2 CW notification
Usage of the urn namespace "alert" with the sub-label "service" and its initial value "call-waiting" within the Alert-Info
header field is described in RFC 7462 [8].
4.5 Signalling requirements
4.5.1 General
Configuration of supplementary services by the user should:
- take place over the Ut interface using XCAP as enabling protocol as described in 3GPP TS 24.623 [7]; or
- use SIP based user configuration as described in 3GPP TS 24.238 [10].
NOTE: Other possibilities for user configuration, such as web-based provisioning or pre-provisioning by the
operator are outside the scope of the present document, but are not precluded.
The enhancements to the XML schema for use over the Ut interface is described in subclause 4.8.
4.5.2 Activation/deactivation
The service CW is individually activated at provisioning or at the subscriber's request.
The service CW is individually deactivated at withdrawal or at the subscriber's request.
4.5.3 Registration/erasure
The CW service requires no registration. Erasure is not applicable.
4.5.4 Interrogation
For interrogation of CW the mechanisms specified in subclause 4.5.1 should be used.
ETSI
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3GPP TS 24.615 version 15.0.0 Release 15 10 ETSI TS 124 615 V15.0.0 (2018-07)
4.5.5 Invocation and operation
4.5.5.1 Actions at the UE of user C
The procedures described for the originating UE in 3GPP TS 24.229 [2] shall apply with the clarifications below.
Upon receipt of a 180 (Ringing) response with an Alert-Info header field set to ""
according to RFC 7462 [8], the UE may indi
...