ETSI TS 124 604 V12.9.0 (2016-05)

Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Communication Diversion (CDIV) using IP Multimedia (IM) Core Network (CN) subsystem; Protocol specification (3GPP TS 24.604 version 12.9.0 Release 12)

RTS/TSGC-0124604vc90

General Information

• Status: Published
• Publication Date: 10-May-2016
• Technical Committee: 3GPP CT 1 - MM/CC/SM [lu] (formely CN1)
• Current Stage: 12 - Completion
• Completion Date: 11-May-2016

Standards Content (Sample)

ETSI TS 1124 604 V12.9.0 (201616-05)

TECHNICAL SPECIFICATIONION
Digital cellular telecommmmunications system (Phase e 2+) (GSM);
Universal Mobile Telelecommunications System ( (UMTS);
LTE;
Communication Diverersion (CDIV) using IP Multimimedia (IM)
Core Neetwork (CN) subsystem;
Protrotocol specification
(3GPP TS 24.6.604 version 12.9.0 Release 12 12)

�
3GPP TS 24.604 version 12.9.0 Release 12 1 ETSI TS 124 604 V12.9.0 (2016-05)

Reference
RTS/TSGC-0124604vc90
Keywords
GSM,LTE,UMTS
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ETSI
3GPP TS 24.604 version 12.9.0 Release 12 2 ETSI TS 124 604 V12.9.0 (2016-05)
Intellectual Property Rights
IPRs essential or potentially essential to the present document 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.
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
http://webapp.etsi.org/key/queryform.asp.
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
3GPP TS 24.604 version 12.9.0 Release 12 3 ETSI TS 124 604 V12.9.0 (2016-05)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 6
1 Scope . 7
2 References . 7
3 Definitions and abbreviations . 8
3.1 Definitions . 8
3.2 Abbreviations . 8
4 Communications Diversion (CDIV) . 9
4.1 Introduction . 9
4.2 Description . 9
4.2.1 General description . 9
4.2.1.1 Service description . 9
4.2.1.2 Communication Forwarding Unconditional (CFU) . 10
4.2.1.3 Communication Forwarding on Busy user (CFB) . 10
4.2.1.4 Communication Forwarding on no Reply (CFNR) . 11
4.2.1.5 Communication Forwarding on Subscriber Not Reachable (CFNRc) . 11
4.2.1.6 Communication Deflection (CD) . 11
4.2.1.7 Communication Forwarding on Not Logged-in (CFNL) . 11
4.2.1.8 Void. 12
4.3 Operational requirements . 12
4.3.1 Provision/withdrawal . 12
4.3.2 Requirements on the originating network side. 13
4.3.3 Requirements in the network . 13
4.4 Coding requirements . 13
4.4.0 General . 13
4.4.1 SIP-Messages . 14
4.4.1.1 SIP messages for redirection . 14
4.4.1.2 Void. 14
4.4.2 Parameters. 14
4.5 Signalling requirements . 14
4.5.0 General . 14
4.5.1 Activation/deactivation . 15
4.5.1a Registration/erasure . 15
4.5.1b Interrogation . 15
4.5.2 Invocation and operation . 15
4.5.2.1 Actions at the originating UA . 15
4.5.2.2 Void. 16
4.5.2.3 Void. 16
4.5.2.4 Void. 16
4.5.2.5 Void. 16
4.5.2.6 Actions at the AS of the diverting User . 16
4.5.2.6.0 General . 16
4.5.2.6.1 Checking of the diversion limits . 16
4.5.2.6.2 Setting of the diversion parameters by the AS . 17
4.5.2.6.3 Diversion procedures at the diverting AS . 20
4.5.2.6.4 Notification procedures of the originating user (Subscription Option) . 22
4.5.2.6.5 Indication of communication diversion to the diverting user (subscription option) . 23
4.5.2.6.6 Not reachable indication . 23
4.5.2.7 Actions at the AS of the diverted-to user . 24
4.5.2.8 Void. 24
4.5.2.9 Void. 24
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4.5.2.10 Void. 24
4.5.2.11 Void. 24
4.5.2.12 Void. 24
4.5.2.13 Void. 24
4.5.2.14 Void. 24
4.5.2.15 Actions at the diverted to UA . 24
4.5.2.16 Actions at the diverting UA . 24
4.6 Interaction with other services . 25
4.6.1 Communication Hold (HOLD) . 25
4.6.2 Terminating Identification Presentation (TIP) . 25
4.6.3 Terminating Identification Restriction (TIR) . 25
4.6.4 Originating Identification Presentation (OIP) . 25
4.6.5 Originating Identification Restriction (OIR) . 25
4.6.6 Conference calling (CONF) . 25
4.6.7 Communication Diversion Services (CDIV) . 26
4.6.8 Malicious Communication Identification (MCID) . 26
4.6.9 Anonymous Communication Rejection and Communication Barring (ACR/CB) . 26
4.6.10 Explicit Communication Transfer (ECT) . 26
4.6.10.1 Actions at the diverting AS . 26
4.6.10.1.1 Determine whether ECT is applied to the diverted communication . 26
4.6.10.1.2 Handling of transfer requests . 26
4.6.10.1.3 Actions when CDIV is invoked again by the transferred communication . 27
4.6.11 Communication Waiting (CW) . 27
4.6.12 Completion of Communications to Busy Subscriber (CCBS) . 27
4.6.13 Advice Of Charge (AOC) . 27
4.7 Interworking with other networks . 28
4.7.1 Void . 28
4.7.2 Void . 28
4.7.3 Void . 28
4.8 Parameter values (timers) . 28
4.8.1 No reply timer . 28
4.8.2 Void . 28
4.8.3 CDIV Indication Timer . 28
4.9 Service Configuration for redirection services . 28
4.9.1 Structure of the XML Document . 28
4.9.1.0 General . 28
4.9.1.1 Communication Diversion Element . 29
4.9.1.1A NoReplyTimer . 29
4.9.1.2 Communication Diversion Rules . 29
4.9.1.3 Communication Diversion Rule Conditions . 30
4.9.1.4 Communication Diversion Rule Actions . 31
4.9.1.5 Supported Actions and Conditions for Communication Diversion . 32
4.9.2 XML Schema . 32
4.9.3 XML schema for indication of supported conditions and actions. 33
4.10 Void . 34
Annex A (informative): Signalling Flows . 35
A.1 Normal cases . 35
A.1.1 Communication Forwarding unconditional . 35
A.1.2 Communication Deflection . 38
A.1.3 Communication forwarding on no reply . 41
A.1.4 Communication Forwarding on Busy. 44
A.1.5 Communication Forwarding Not Logged-in (CFNL) . 46
A.1.6 Void . 47
A.1.7 Service configuration . 47
A.2 Interworking . 51
A.2.1 Communication Forwarding unconditional . 51
A.2.2 Communication Deflection . 51
Annex B (informative): Example of filter criteria . 53
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Annex C (informative): Coding considerations . 54
Annex D (informative): Void . 55
Annex E (normative): Void . 56
Annex F (informative): Change history . 57
History . 59

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Foreword
This Technical Specification (TS) was been produced by ETSI Technical Committee Telecommunications and Internet
converged Services and Protocols for Advanced Networking (TISPAN) and originally published as
ETSI TS 183 004 [19]. It was transferred to the 3rd Generation Partnership Project (3GPP) in January 2008.
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.
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1 Scope
The present document specifies the stage 3, Protocol Description of the Communications Diversion (CDIV)
supplementary services, based on stage one and two of the ISDN Communication diversion 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 present document is applicable to User Equipment (UE) and Application Servers (AS) which are intended to
support the CDIV 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: "Multimedia Telephony Service and supplementary services".
[2] 3GPP TS 24.229: "IP Multimedia Call Control Protocol based on SIP and SDP".
[3] IETF RFC 7044: "An Extension to the Session Initiation Protocol (SIP) for Request History
Information".
[4] 3GPP TS 24.623: "Extensible Markup Language (XML) Configuration Access Protocol (XCAP)
over the Ut interface for Manipulating Supplementary Services".
[5] IETF RFC 4566: "SDP: Session Description Protocol".
[6] IETF RFC 3261: "SIP: Session Initiation Protocol".
[7] IETF RFC 3966: "The tel URI for Telephone Numbers".
[8] IETF RFC 3325: "Private Extensions to the Session Initiation Protocol (SIP) for Asserted Identity
within Trusted Networks".
[9] 3GPP TS 24.611: "Anonymous Communication Rejection (ACR) and Communication Barring
(CB); Protocol specification".
[10] Void.
[11] 3GPP TS 24.628: "Common Basic Communication procedures; Protocol specification".
[12] 3GPP TS 23.002: "Network Architecture".
[13] Void.
[14] IETF RFC 4458: "Session Initiation Protocol (SIP) URIs for Applications such as Voicemail and
Interactive Voice Response (IVR)".
[15] IETF RFC 6665: "SIP -Specific Event Notification".
[16] 3GPP TS 24.629: "Explicit Communication Transfer (ECT); Protocol specification".
[17] IETF RFC 3515: "The Session Initiation Protocol (SIP) Refer Method".
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[18] IETF RFC 4745: "Common Policy: A Document Format for Expressing Privacy Preferences".
[19] ETSI TS 183 004 V2.4.0: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); PSTN/ISDN simulation services: Communication Diversion
(CDIV); Protocol specification".
[20] IETF RFC 5627 (October 2009): "Obtaining and Using Globally Routable User Agent URIs
(GRUUs) in the Session Initiation Protocol (SIP)".
[21] OMA-TS-XDM-Core-V1_1: "XML Document Management (XDM) Specification", Version 1.1.
[22] 3GPP TS 24.238: "Session Initiation Protocol (SIP) based user configuration".
[23] Void.
[24] IETF RFC 3326: "The Reason Header Field for the Session Initiation Protocol (SIP)".
[25] 3GPP TS 24.315: "IMS Operator Determined Barring".
[26] IETF RFC 3023 (January 2001): "XML Media Types".
[27] IETF RFC 4288 (December 2005): "Media Type Specifications and Registration Procedures".
[28] IETF RFC 7090 (April 2014): "Public Safety Answering Point (PSAP) Callback".
[29] IETF RFC 7647 (September 2015): "Clarifications for the use of REFER with RFC6665".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in 3GPP TS 22.173 [1] and the following
apply:
CDIV Session Identifier URI: URI created and inserted by a diverting AS that is routed through the same AS
NOTE: This is used to solve the service interaction of CDIV and ECT.
escaped character: See IETF RFC 3261 [6].
diverting user: served user of the communication diversion service invoked
diverted-to party: party that the existing communication is forwarded to
NOTE: After forwarding the originating user and the diverted-to party are in communication with each other.
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ACM Address Complete Message
ACR Anonymous Communication Rejection
ANM ANswer Message
AP Authentication Proxy
AS Application Server
CB Communication Barring
CD Communication Deflection
CDIV Communication DIVersion
CFB Communication Forwarding Busy
CFNL Communication Forwarding on Not Logged-in
CFNR Communication Forwarding No Reply
CFNRc Communication Forwarding on subscriber Not Reachable
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CFU Communication Forwarding Unconditional
CONF CONFerence
CPG Call ProGress message
CSCF Call Session Control Function
ECT Explicit Communication Transfer
HOLD communication HOLD
IAM Initial Address Message
IFC Initial Filter Criteria
IMS IP Multimedia Subsystem
IP Internet Protocol
ISDN Integrated Service Data Network
ISUP Integrated Service digital network User Part
MCID Malicious Communication IDentification
MGCF Media Gateway Control Function
OCB Outgoing Communication Barring
ODB Operator Determined Barring
OIP Originating Identification Presentation
OIR Originating Identification Restriction
P-CSCF Proxy-Call Session Control Function
PSAP Public Safety Answering Point
PSTN Public Switched Telephone Network
RTP Real-Time Transport Protocol
S-CSCF Server-Call Session Control Function
SDP Session Description Protocol
SIP Session Initiation Protocol
TIP Terminating Identification Presentation
TIR Terminating Identification Restriction
UA User Agent
UE User Equipment
URI Universal Resource Identifier
XCAP XML Configuration Access Protocol
XML eXtensible Markup Language
4 Communications Diversion (CDIV)
4.1 Introduction
The Communications Diversion (CDIV) service enables diverting user, to divert the communications addressed to
diverting user to another destination.
Procedures for the CDIV AS regarding Operator Determined Barring (ODB) are defined in 3GPP TS 24.315 [25].
4.2 Description
4.2.1 General description
4.2.1.1 Service description
The service description of the following CDIVs ervices CFU, CFB, CFNR and CD is based on the PSTN/ISDN
supplementary services, whereas CFNL is a CDIV service based on requirements for IP based networks and CFNRc is
based on requirements for mobile networks.
Generally the following requirements are expected to be fulfilled:
- The service provides for the user or the network to identify an alternative destination for an IP multimedia
session or individual media of an IP multimedia session.
- The service provides for redirection to be initiated at various stages of an IP Multimedia session. For example:
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- Prior to the set up of an IP Multimedia session.
- During the initial request for an IP Multimedia session (CFU).
- During the establishment of an IP Multimedia session (CD).
- The service provides redirection to be applied for all Multimedia sessions unconditionally or it can be caused by
any of a set list of events or conditions. Typical causes could be:
- Identity of the originating user.
- Presence of the originating or destination party.
- If the destination party is already in a session (CFB).
- If the destination party is unreachable or unavailable in some other way (CFNL; CFNR, CFNRc).
- If the destination party does not respond (CFNR).
- After a specified alerting interval (CFNR).
- User's preference on routing for specific IP Multimedia session based on the capabilities of multiple UEs
sharing the same IMS service subscription.
- The sending party, receiving party or the network on their behalf, may initiate redirection to alternative
destinations.
- The service provides for the user to subscribe to receive notifications of his/her communications diversions.
The following services describe applications based on a subset of the above-mentioned requirements to provide user
different possibilities to divert a communication.
It should be possible that a user has the option to restrict receiving communications that are forwarded.
4.2.1.2 Communication Forwarding Unconditional (CFU)
The CFU service enables a served user to have the network redirect to another user communications which are
addressed to the served user's address. The CFU service may operate on all communications, or just those associated
with specified services. The served user's ability to originate communications is unaffected by the CFU supplementary
service. After the CFU service has been activated, communications are forwarded independent of the status of the
served user.
As a service provider option, a subscription option can be provided to enable the served user to receive a reminder
indication that the CFU service has been activated. This indication is provided when the served user originates a
communication and if the CFU service has been activated for the served user's address and for the service requested for
the communication.
The maximum number of diversions permitted for each communication is a service provider option. The service
provider defines the upper limit of diversions. When counting the number of diversions, all types of diversion are
included.
4.2.1.3 Communication Forwarding on Busy user (CFB)
The CFB service enables a served user to have the network redirect to another user communications which are
addressed to the served user's address and meet busy. The CFB service may operate on all communications, or just
those associated with specified services. The served user's ability to originate communications is unaffected by the CFB
supplementary service.
As a service provider option, a subscription option can be provided to enable the served user to receive a reminder
indication that the CFB service has been activated. This indication is provided when the served user originates a
communication and if the CFB service has been activated for the served user's address and for the service requested for
the communication.
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The maximum number of diversions permitted for each communication is a service provider option. The service
provider defines the upper limit of diversions. When counting the number of diversions, all types of diversion are
included.
For more information on the procedures for determination of the busy condition see 3GPP TS 24.628 [11].
4.2.1.4 Communication Forwarding on no Reply (CFNR)
The CFNR service enables a served user to have the network redirect to another user communications which are
addressed to the served user's address, and for which the connection is not established within a defined period of time.
The CFNR service may operate on all communications, or just those associated with specified services. The served
user's ability to originate communications is unaffected by the CFNR supplementary service.
The CFNR service can only be invoked by the network after the communication has been offered to the served user and
an indication that the called user is being informed of the communication has been received.
As a service provider option, a subscription option can be provided to enable the served user to receive a reminder
indication that the CFNR service has been activated. This indication is provided when the served user originates a
communication and if the CFNR service has been activated for the served user's address and for the service requested
for the communication.
The maximum number of diversions permitted for each communication is a service provider option. The service
provider defines the upper limit of diversions. When counting the number of diversions, all types of diversion are
included.
4.2.1.5 Communication Forwarding on Subscriber Not Reachable (CFNRc)
The CFNRc service enables a user to have the network redirect all incoming communications, when the user is not
reachable (e.g. there is no IP connectivity to the user's terminal), to another user. The CFNRc service may operate on all
communications, or just those associated with specified services. The user's ability to originate communications is
unaffected by the CFNRc supplementary service.
As a service provider option, a subscription option can be provided to enable the user to receive an indication that the
CFNRc service has been activated. This indication is provided when the user originates a communication if the CFNRc
service has been activated for the user and for the service requested for the communication.
The maximum number of diversions permitted for each communication is a service provider option. The service
provider defines the upper limit of diversions. When counting the number of diversions, all types of diversion are
included.
4.2.1.6 Communication Deflection (CD)
The CD service enables the served user to respond to an incoming communication by requesting redirection of that
communication to another user. The CD service can only be invoked before the connection is established by the served
user, i.e. in response to the offered communication (before ringing), i.e. CD Immediate, or during the period that the
served user is being informed of the communication (during ringing). The served user's ability to originate
communications is unaffected by the CD supplementary service.
The maximum number of diversions permitted for each communication is a network provider option. The network
provider defines the upper limit of diversions. When counting the number of diversions, all types of diversion are
included.
4.2.1.7 Communication Forwarding on Not Logged-in (CFNL)
The Communication Forwarding on Not Logged-in (CFNL) service enables a served user to redirect incoming
communications which are addressed to the served user's address, to another user (forwarded-to address) in case the
served user is not registered (logged-in). The CFNL service may operate on all communications, or just those associated
with specified basic services.
As a service provider option, a subscription option can be provided to enable the served user to receive a reminder
indication that the CFNL service has been activated. This indication is provided when the served user logs out
according to procedures described in IETF RFC 3261 [6].
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The maximum number of diversions permitted for each communication is a service provider option. The service
provider defines the upper limit of diversions. When counting the number of diversions, all types of diversion are
included.
4.2.1.8 Void
4.3 Operational requirements
4.3.1 Provision/withdrawal
The CDIV services (Communication forwarding unconditional, Communication forwarding busy, Communication
forwarding no reply, Communication forwarding not logged-in, Communication deflection and Communication
Diversion Notification) is provided after prior arrangement with the service provider.
The CDIV services are withdrawn at the served user's request or for administrative reasons.
The CDIV supplementary services can be offered separately with subscription options. For each subscription option,
only one value can be selected. These subscription options are part of the call diversion profile for the served user. The
subscription options are shown in table 4.3.1.1.
Table 4.3.1.1: Subscription options for CDIV services
Subscription options Value Applicability
Served user receives indication that a No (default) CFU
communication has been forwarded ________________________ CFB
(indication of communication diversion to the Yes CFNR
diverting user). CFNRc
Originating user receives notification that his
No CFU
communication has been diverted (forwarded ________________________ CFB
or deflected). Yes (default) CFNR
CFNRc
CFNL
CD
Served user allows the presentation of No CFU
diverted to URI to originating user in diversion ________________________ CFB
notification. Not reveal as GRUU CFNR
________________________ CFNRc
Yes (default) CFNL
CD
Served user receives reminder indication on No (default) CFU
outgoing communication that CDIV is ________________________ CFB
currently activated. Yes CFNR
CFNRc
CFNL
Served user allows the presentation of his/her No CFU
URI to diverted-to user. ________________________ CFB
Not reveal as GRUU CFNR
________________________ CFNRc
Yes (default) CFNL
CD
Served user allows the presentation of his/her No CFU
URI to originating user in diversion ________________________ CFB
notification. Not reveal as GRUU CFNR
________________________ CFNRc
Yes (default) CFNL
CD
The following network provider options are available for the CDIV services:
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Table 4.3.1.2: Network provider options for CDIV services
Network provider option Value Applicability
Served user communication retention on Retain communication to the served user until alerting CFNR
invocation of diversion (forwarding or begins at the diverted-to user CD
deflection). ________________________
Clear communication to the served user on invocation
of call diversion
Served user communication retention Continue to alert the diverting user (see note 1) CFNR
when diverting is rejected at ________________________ CD
diverted-to user. No action at the diverting user (see note 2)
Subscription option is provided for No CFU
"served user receives reminder indication ________________________ CFB
on outgoing communication that CDIV is Yes CFNR
currently activated". CFNRc
CFNL
Total number of all diversions for each Maximum number of diverted connections CFU
communication. ( upper limit is based on operator policy) CFB
CFNR
CFNRc
CFNL
CD
AS behaviour when the maximum number Reject the communication (default) CFU
of diversions for a communication is ________________________ CFB
reached. CFNR
Deliver the communication to the latest diverting party CFNRc
CFNL
CD
CDIV Indication Timer. Timer duration is a service provider option CFU
CFB
CFNR
CFNRc
CFNL
CD
Communication forwarding on no reply Timer default duration is a service provider option CFNR
timer. (NOTE 3)
NOTE 1: This applies to the retention of the communication at invocation of communication diverting.
NOTE 2: This applies to the clearing communication option on invocation of communication diverting.
NOTE 3: As a network provider option, it shall be possible to change the timer duration by the served user.

4.3.2 Requirements on the originating network side
No specific requirements are needed in the network.
4.3.3 Requirements in the network
No specific requirements are needed in the network.
Based on the Initial Filter Criteria (IFC) Rules, indicating that the served user is subscribed to the CDIV supplementary
services, the communication is be forwarded to an AS.
NOTE: An example of the use of IFC is shown in annex B.
4.4 Coding requirements
4.4.0 General
3GPP TS 24.229 [2] defines the messages and parameters for this supplementary service. The following messages and
parameters are used to support the Communication diversion service due to fulfil the requirements.
ETSI
3GPP TS 24.604 version 12.9.0 Release 12 14 ETSI TS 124 604 V12.9.0 (2016-05)
4.4.1 SIP-Messages
4.4.1.1 SIP messages for redirection
Table 4.4.1.1 shows the SIP messages that are used due to the coding rules in 3GPP TS 24.229 [2].
Table 4.4.1.1: SIP Header information for redirection
SIP Message Reference SIP Header
INVITE [3] History-Info header
[8] Privacy header
[14] cause-param URI parameter
[20] "gr" URI parameter
180 (Ringing) [3] History-Info header
[8] Privacy header
[14] cause-param URI parameter
[20] "gr" URI parameter in the Contact
181 (Call Is Being Forwarded) [3] Histor
...