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TECHNICAL SPECIFICATION
Universal Mobile Telecommunications System (UMTS);
LTE;
Multicall;
Service description;
Stage 1
(3GPP TS 22.135 version 15.0.0 Release 15)
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3GPP TS 22.135 version 15.0.0 Release 15 1 ETSI TS 122 135 V15.0.0 (2018-07)
Reference
RTS/TSGS-0122135vf00
Keywords
LTE,UMTS
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ETSI
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3GPP TS 22.135 version 15.0.0 Release 15 2 ETSI TS 122 135 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
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Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
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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 22.135 version 15.0.0 Release 15 3 ETSI TS 122 135 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, symbols and abbreviations . 6
3.1 Definitions . 6
4 Description . 7
4.1 Description of multicall . 7
4.2 Applicability to telecommunication services. 7
5 Functional requirements . 7
5.1 Provision . 7
5.2 Withdrawal . 7
5.3 Registration . 7
5.4 Erasure . 7
5.5 Activation . 8
5.6 Deactivation . 8
5.7 Invocation . 8
5.8 Interrogation . 8
5.9 Call related procedures . 8
5.9.1 Terminating CS call . 8
5.9.2 Originating CS call . 8
5.10 Charging requirements . 9
6 Exceptional procedures or unsuccessful outcome . 9
6.1 Exceptional operation or unsuccessful outcome . 9
6.2 Registration . 9
6.3 Erasure . 9
6.4 Activation . 9
6.5 Deactivation . 9
6.6 Invocation . 9
6.7 Interrogation . 9
6.8 Roaming in non-supporting networks . 10
7 Interaction with other services . 10
7.1 Line Identification . 10
7.1.1 Calling Line Identification Presentation (CLIP) . 10
7.1.2 Calling Line Identification Restriction (CLIR) . 10
7.1.3 Connected Line Identification Presentation (COLP) . 10
7.1.4 Connected Line Identification Restriction (COLR) . 10
7.2 Call Forwarding . 10
7.2.1 Call Forwarding Unconditional (CFU) . 10
7.2.2 Call Forwarding on Busy (CFB) . 10
7.2.3 Call Forwarding on No Reply (CFNRy) . 10
7.2.4 Call Forwarding on Not Reachable (CFNRc) . 10
7.3 Call Completion . 10
7.3.1 Call Hold (CH) . 10
7.3.2 Call Waiting (CW) . 11
7.4 Multi Party (MPTY) . 11
7.5 Closed User Group (CUG) . 11
7.6 Advice of Charge (AoC) . 11
7.7 Call Barring . 11
7.7.1 Barring of all outgoing calls . 11
ETSI
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3GPP TS 22.135 version 15.0.0 Release 15 4 ETSI TS 122 135 V15.0.0 (2018-07)
7.7.2 Barring of outgoing international calls . 11
7.7.3 Barring of outgoing international calls except those directed to the HPLMN country . 12
7.7.4 Barring of all incoming calls. 12
7.7.5 Barring of incoming calls when roaming . 12
7.8 Explicit Call Transfer (ECT) . 12
7.9 Completion of Call to Busy Subscriber (CCBS) . 12
7.10 Multiple Subscriber Profile (MSP) . 12
7.11 Calling Name Presentation (CNAP) . 12
7.12 User-to-User Signalling (UUS) . 12
7.13 enhanced Multi-Level Precedence and Pre-emption service (eMLPP) . 12
7.14 Call Deflection (CD) . 12
8 Interaction with other network features and services . 12
8.1 CAMEL . 12
8.2 IST . 12
8.3 ODB . 13
8.4 Emergency Calls . 13
Annex A (normative): Busy definition . 14
Annex B (informative): Cross Phase Compatibility . 15
B.1 Compatibility With Existing Standards . 15
B.2 Compatibility With Future Releases . 15
B.2.1 Multicall configuration . 15
B.2.2 Several simultaneous speech calls / bearers . 15
B.2.3 CCBS . 16
Annex C (informative): Change history . 17
History . 19
ETSI
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3GPP TS 22.135 version 15.0.0 Release 15 5 ETSI TS 122 135 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 22.135 version 15.0.0 Release 15 6 ETSI TS 122 135 V15.0.0 (2018-07)
1 Scope
The present document presents describes Multicall supplementary service.
The general aspects, including definitions and recommended provision, of the description of the 3GPP Supplementary
Services are given in 3GPP TS 22.004.
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 22.001: "Principles of circuit telecommunication services supported by a Public Land
Mobile Network (PLMN)".
[2] 3GPP TS 22.004: "General on Supplementary Services".
[3] 3GPP TS 22.024: "Description of Charge Advice Information (CAI)".
[4] 3GPP TS 22.030: "Man-Machine Interface (MMI) of the Mobile Station (MS)".
[5] 3GPP TS 22.100: "UMTS Phase 1 Release 99".
[6] 3GPP TS 22.129: "Handover Requirement between UTRAN and GERAN or other Radio
Systems".
[7] 3GPP TS 22.097: "Multiple Subscriber Profile (MSP) ".
3 Definitions, symbols and abbreviations
3.1 Definitions
CS Call: Circuit switched call. A call routed through CS domain. CS call can be for example a speech call, fax call or
data call. One call shall only use one bearer at the time
Multiparty: Supplementary Service for speech conference service
N MO: maximum number of simultaneous mobile originating CS calls. The value of The Value of N MOis 7. If
cs cs_
N MO has been reached, no more MO calls can be set–up
cs_
NCS_MT: Maximum number of simultaneous mobile terminating CS calls. The value of N MT is 7. If N MT has
CS_ CS_
been reached, additional MT call attempts shall fail without any indication to the called subscriber
Nbr: Maximum number of simultaneous CS bearers. The value of Nbr is the smallest value within the Nbr_User,
Nbr_UE, and Nbr_SN
N _User: Maximum number of simultaneous CS bearers allowed, as defined by the user within the limits given by
br
N _SB
br
Nbr_SB: Maximum number of simultaneous CS bearers allowed, defined by the service provider in the Multicall
subscription
Nbr_UE: Maximum number of simultaneous CS bearers supported by the UE
ETSI
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3GPP TS 22.135 version 15.0.0 Release 15 7 ETSI TS 122 135 V15.0.0 (2018-07)
N _SN: Maximum number of simultaneous CS bearers supported by the serving network
br
4 Description
4.1 Description of multicall
The Multicall supplementary service enables a mobile subscriber to have several simultaneous CS calls, each call using
its own dedicated bearer.
Only one CS bearer can used for speech at any one times.
A speech call is one of TS11 (Telephony), TS12 (Emergency Calls), and TS61 (Alternate speech/fax). If the bearer
capability information is not available, e.g. the call is originated/transited by a PSTN, the basic service cannot be
deduced and the network shall, for multicall purposes, handle the call as telephony.
A held call shall be regarded as using the bearer used while the call was active.
NOTE: The 3GPP protocol architecture allows several parallel CS calls, the limitation being that there is only one
traffic channel in GERAN, which the different CS calls share. This is facilitated by e.g. the Call Waiting,
Call Hold, Call Transfer and Multiparty Supplementary Services. Call configurations related to
supplementary services are not considered as
...