ETSI TS 186 015-2 V2.1.1 (2009-07)

Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); PSTN/ISDN simulation services: Explicit Communication Transfer (ECT); Part 2: Test Suite Structure and Test Purposes (TSS&TP)

DTS/TISPAN-06032-2-NGN-R2

General Information

• Status: Published
• Publication Date: 19-Jul-2009
• Technical Committee: TISPAN 6 - TISPAN Testing
• Current Stage: 12 - Completion
• Due Date: 17-Jul-2009
• Completion Date: 20-Jul-2009

Standards Content (Sample)

ETSI TS 186 015-2 V2.1.1 (2009-07)
Technical Specification


Telecommunications and Internet converged Services and
Protocols for Advanced Networking (TISPAN);
PSTN/ISDN simulation services:
Explicit Communication Transfer (ECT);
Part 2: Test Suite Structure and Test Purposes (TSS&TP)

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2 ETSI TS 186 015-2 V2.1.1 (2009-07)



Reference
DTS/TISPAN-06032-2-NGN-R2
Keywords
testing, ECT, TSS&TP, IMS
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ETSI

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3 ETSI TS 186 015-2 V2.1.1 (2009-07)
Contents
Intellectual Property Rights . 4
Foreword . 4
1 Scope . 5
2 References . 5
2.1 Normative references . 5
2.2 Informative references . 5
3 Definitions and abbreviations . 6
3.1 Definitions . 6
3.2 Abbreviations . 6
4 Test Suite Structure (TSS) and configuration . 6
4.1 Configuration . 6
5 Test Purposes (TP) . 7
5.1 Introduction . 7
5.1.1 TP naming convention . 7
5.1.2 Test strategy . 8
5.2 Signalling requirements . 9
5.2.1 Actions at the Transferor AS . 9
5.2.2 Action at the Transferee AS . 30
5.2.3 Action at the User equipment . 37
5.2.3.1 Actions at the Transferor UE . 37
5.2.3.2 Actions at the Transferee UE . 39
5.2.3.3 Actions at the Transfer target UE . 42
5.2.4 Interaction with other services . 43
5.2.4.1 Originating identification restriction (OIR) . 43
5.2.4.2 Anonymous Communication Rejection and Communication Barring (ACR/CB) . 45
5.2.4.3 CONFerence Calling (CONF) . 46
5.2.4.4 Explicit Communication Transfer (ECT) . 47
Annex A (informative): Bibliography . 50
History . 51

ETSI

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4 ETSI TS 186 015-2 V2.1.1 (2009-07)
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 (http://webapp.etsi.org/IPR/home.asp).
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 Technical Committee Telecommunications and Internet
converged Services and Protocols for Advanced Networking (TISPAN).
The present document is part 2 Test Suite Structure and Test Purposes (TSS&TP)of the Explicit Communication
transfer (ECT) simulation service, based on stage one and two of the ISDN ECT supplementary service. Within the
Next Generation Network (NGN) the stage 3 description is specified using the IP Multimedia Communication Control
Protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP) as described below:
Part 1: "Protocol Implementation Conformance Statement (PICS)";
Part 2: "Test Suite Structure and Test Purposes (TSS&TP).
ETSI

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5 ETSI TS 186 015-2 V2.1.1 (2009-07)
1 Scope
The present document specifies the Test Suite Structure and Test Purposes (TSS&TP) of the Explicit Communication
transfer (ECT) simulation service, based on stage one and two of the ISDN ECT supplementary service. Within the
Next Generation Network (NGN) the stage 3 description is specified using the IP Multimedia Call Control Protocol
based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP), TS 183 029 [1].
A further part of the present document specifies the Abstract Test Suite (ATS) and partial Protocol Implementation
eXtra Information for Testing (PIXIT) proforma based on the present document.
Within the TISPAN NGN, the stage 3 description is specified using the IP Multimedia Call Control Protocol based on
Session Initiation Protocol (SIP) and Session Description Protocol (SDP).
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• Non-specific reference may be made only to a complete document or a part thereof and only in the following
cases:
- if it is accepted that it will be possible to use all future changes of the referenced document for the
purposes of the referring document;
- for informative references.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee
their long term validity.
2.1 Normative references
The following referenced documents are indispensable for the application of the present document. For dated
references, only the edition cited applies. For non-specific references, the latest edition of the referenced document
(including any amendments) applies.
[1] ETSI TS 183 029: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); PSTN/ISDN simulation services: Explicit Communication
Transfer (ECT); Protocol specification".
[2] ETSI TS 186 015-1: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); PSTN/ISDN simulation services: Explicit Communication
Transfer (ECT); Part 1: Protocol Implementation conformance Statement (PICS)".
2.2 Informative references
The following referenced documents are not essential to the use of the present document but they assist the user with
regard to a particular subject area. For non-specific references, the latest version of the referenced document (including
any amendments) applies.
Not applicable.
ETSI

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6 ETSI TS 186 015-2 V2.1.1 (2009-07)
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions specified in [1] apply.
3.2 Abbreviations
For the purposes of the present document, the abbreviations specified in [1] apply.
4 Test Suite Structure (TSS) and configuration
Netw
TransferorAS ECT_N01_xxx
TransfereeAS ECT_N02_xxx

User Transferor ECT_U01_xxx
Transferee
ECT_U02_xxx
TransferTarget
ECT_U03_xxx

Interaction OIR ECT_N03_xxx
ACR-CB ECT_N04_xxx
CONF ECT_N05_xxx
ECT ECT_N06_xxx

Figure 1: Test suite structure
4.1 Configuration
The scope of the current specification is to test the signalling and procedural aspects of the stage 3 requirements as
described in [1]. The stage 3 description respects the requirements to several network entities and also to requirements
regarding to end devices. Therefore several interfaces (reference points) are addressed to satisfy the test of the different
entities.
Therefore to test the appropriate entities the configurations below are applicable:
Testing of the Application Server: This entity is responsible to perform the service. Hence the ISC interface is the
appropriate access point. Figure 2 points to this.

Figure 2: Applicable interface to test AS functionalities
ETSI

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7 ETSI TS 186 015-2 V2.1.1 (2009-07)
If the ISC interface is not accessible it is also applicable to perform the test of the AS using any NNI (Mw, Mg, Mx)
interface (consider figure 3). In case only the Gm interface is accessible this shall be used instead. In this case, be aware
that the verification of several requirements is impeded.
Mw, Mg, Mx
Mw, Mg, Mx
CSCF
Test (and/or AS) Test
System System
Implementation
under Test

Figure 3: Applicable interfaces to test using the (generic) NNI interface
Figure 4 illustrates the usage of any NNI interface.
Testing of User Equipment: There are several requirements regarding to the end devices. Therefore a special
configuration appears.
Gm
User Equipment
Test
System Implementation
under Test

Figure 4: Applicable configuration to test the User Equipment
5 Test Purposes (TP)
5.1 Introduction
For each test requirement a TP is defined.
5.1.1 TP naming convention
TPs are numbered, starting at 001, within each group. Groups are organized according to the TSS. Additional references
are added to identify the actual test suite and whether it applies to the network or the user (see table 1).
ETSI

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8 ETSI TS 186 015-2 V2.1.1 (2009-07)
Table 1: TP identifier naming convention scheme
Identifier: __
= supplementary service: e.g. "ECT"
= type of IUT: U User
N Network
= group 2 digit field representing group reference according to TSS
= sequential number (001-999)

5.1.2 Test strategy
As the base standard TS 183 029 [1] contains no explicit requirements for testing, the TPs were generated as a result of
an analysis of the base standard and the PICS specification TS 186 015-1 [2].
ETSI

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9 ETSI TS 186 015-2 V2.1.1 (2009-07)
5.2 Signalling requirements
5.2.1 Actions at the Transferor AS
TSS TP Reference Selection expression
Netw/TransferorAS ECT_N01_001 4.5.2.4 [1] PICS 1/2 1 AND
NOT (PICS 1/4 OR PICS 1/5)
Test purpose
Communication transfer: Assured transfer. Transferor was originator of the originating call.
Ensure that a Transferor can successfully transfer the communication with the transferee set on hold before and
the Transferor is notified about the processing. After the communication between the Transferee and the Transfer
Target is confirmed, the communication between Transferor and Transferee is terminated. The Transferor was the
initiator of the originating communication.
SIP header values:
REFER 1: Refer-To contains ISC#3 URI; method=invite
  Referred-By contains ISC#1 URI
REFER 2: Refer-To contains ECT Session Identifier URI; method=invite
  Referred-By contains ISC#ISC#1 URI
INVITE 3: Request URI = ECT Session Identifier URI
INVITE 4: Request URI = ISC#3 URI
NOTIFY(100): Event contains refer
  message/sipfrag contains SIP/2.0 100 Trying
NOTIFY(200): Event contains refer
  message/sipfrag contains SIP/2.0 200 OK
Comments:
ISC#1 AS Transferor ISC#2 ISC#3
Establishment of session #1
INVITE 1  INVITE

180 Ringing 180 Ringing
200 OK (INVITE)  200 OK (INVITE)
ACK  ACK

INVITE 2 (sendonly)  INVITE (sendonly)
200 OK (recvonly)  200 OK (recvonly)

ACK ACK
ISC#1 transfers ISC#2 to ISC#3
REFER 1 REFER

 REFER 2 REFER
 202 Accepted 202 Accepted
202 Accepted 202 Accepted
INVITE (inactive)  INVITE (inactive)
200 OK (inactive)  200 OK (inactive)

ACK ACK

NOTIFY(100)  NOTIFY(100)

200 OK NOTIFY 200 OK NOTIFY
 INVITE INVITE 3
 INVITE 4  INVITE

 180 Ringing 180 Ringing
 180 Ringing 180 Ringing
 200 OK  200 OK

 200 OK 200 OK
  ACK ACK
NOTIFY(200)  NOTIFY(200)

200 OK NOTIFY 200 OK NOTIFY
BYE  BYE
200 OK (BYE)  200 OK (BYE)
  Communication ISC#2 with ISC#3
 BYE BYE 2
 BYE  BYE

 200 OK (BYE) 200 OK (BYE)
 200 OK (BYE) 200 OK (BYE)


ETSI

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10 ETSI TS 186 015-2 V2.1.1 (2009-07)
TSS TP Reference Selection expression
Netw/TransferorAS ECT_N01_002 4.5.2.4 [1] PICS 1/2 AND
NOT (PICS 1/4 OR PICS 1/5)
Test purpose
Communication transfer: Assured transfer. Transferee was originator of the originating call.
Ensure that a Transferor can successfully transfer the communication with the transferee set on hold before and
the Transferor is notified about the processing. After the communication between the Transferee and the Transfer
Target is confirmed, the communication between Transferor and Transferee is terminated. The Transferee was the
initiator of the originating communication.
SIP header values:
REFER 1: Refer-To contains ISC#3 URI; method=invite
  Referred-By contains ISC#1 URI
REFER 2: Refer-To contains ECT Session Identifier URI; method=invite
  Referred-By contains ISC#1 URI
INVITE 3: Request URI = ECT Session Identifier URI
INVITE 4: Request URI = ISC#3 URI
NOTIFY(100): Event contains refer
  message/sipfrag contains SIP/2.0 100 Trying
NOTIFY(200): Event contains refer
  message/sipfrag contains SIP/2.0 200 OK
Comments:
ISC#1 AS Transferor ISC#2 SC#3
Establishment of session #1

INVITE INVITE 1
180 Ringing  180 Ringing
200 OK (INVITE)  200 OK (INVITE)
ACK  ACK


INVITE 2 (sendonly) INVITE (sendonly)

200 OK (recvonly) 200 OK (recvonly)
ACK  ACK
ISC#1 transfers ISC#2 to ISC#3

REFER 1 REFER
  REFER 2

 202 Accepted 202 Accepted
202 Accepted 202 Accepted
INVITE (inactive)  INVITE (inactive)

200 OK (inactive) 200 OK (inactive)
ACK  ACK


NOTIFY(100) NOTIFY(100)
200 OK NOTIFY  200 OK NOTIFY
 INVITE INVITE 3

 INVITE 4 INVITE
 180 Ringing  180 Ringing
 180 Ringing 180 Ringing
 200 OK  200 OK
 200 OK 200 OK

  ACK ACK

NOTIFY(200) NOTIFY(200)
200 OK NOTIFY  200 OK NOTIFY

BYE BYE
200 OK (BYE)  200 OK (BYE)
  Communication ISC#2 with ISC#3

 BYE BYE 2
 BYE  BYE
 200 OK (BYE)  200 OK (BYE)

 200 OK (BYE) 200 OK (BYE)



ETSI

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11 ETSI TS 186 015-2 V2.1.1 (2009-07)
TSS TP Reference Selection expression
Netw/TransferorAS ECT_N01_003 4.5.2.4 [1] PICS 1/1 AND
NOT (PICS 1/4 OR PICS 1/5)
Test purpose
Communication transfer: Blind transfer. Transferor was originator of the originating call.
Ensure that a Transferor can successfully transfer the communication with the transferee set on hold before and
the Transferor is notified about the processing. After the REFER request to the Transferee is sent, the
communication between Transferor and Transferee is terminated. The Transferor was the initiator of the originating
communication.
SIP header values:
REFER 1: Refer-To contains ISC#3 URI; method=invite
  Referred-By contains SC#1 URI
REFER 2: Refer-To contains ECT Session Identifier URI; method=invite
  Referred-By contains ISC#1 URI
INVITE 3: Request URI = ECT Session Identifier URI
INVITE 4: Request URI = ISC#3 URI
NOTIFY(100): Event contains refer
  message/sipfrag contains SIP/2.0 100 Trying
NOTIFY(200): Event contains refer
  message/sipfrag contains SIP/2.0 200 OK
Comments:
ISC#1 AS Transferor ISC#2 ISC#3
Establishment of session #1

INVITE 1 INVITE
180 Ringing  180 Ringing
200 OK (INVITE)  200 OK (INVITE)
ACK  ACK


INVITE 2 (sendonly) INVITE (sendonly)

200 OK (recvonly) 200 OK (recvonly)
ACK  ACK
ISC#1 transfers ISC#2 to ISC#3

REFER 1 REFER
 REFER 2 REFER

 202 Accepted 202 Accepted
202 Accepted 202 Accepted
BYE  BYE

200 OK (BYE) 200 OK (BYE)

NOTIFY(100)  NOTIFY(100)

200 OK NOTIFY 200 OK NOTIFY
 INVITE INVITE 3
 INVITE 4  INVITE

 180 Ringing 180 Ringing
 180 Ringing 180 Ringing
 200 OK  200 OK
 200 OK 200 OK
  ACK ACK

NOTIFY(200) NOTIFY(200)

200 OK NOTIFY 200 OK NOTIFY
  Communication ISC#2 with ISC#3

 BYE BYE 2
 BYE  BYE
 200 OK (BYE)  200 OK (BYE)

 200 OK (BYE) 200 OK (BYE)


ETSI

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12 ETSI TS 186 015-2 V2.1.1 (2009-07)
TSS TP Reference Selection expression
Netw/TransferorAS ECT_N01_004 4.5.2.4 [1] PICS 1/1 AND
NOT (PICS 1/4 OR PICS 1/5)
Test purpose
Communication transfer: Blind transfer. Transferee was originator of the originating call.
Ensure that a Transferor can successfully transfer the communication with the transferee set on hold before and
the Transferor is notified about the processing. After the REFER request to the Transferee is sent, the
communication between Transferor and Transferee is terminated. The Transferee was the initiator of the
originating communication.
SIP header values:
REFER 1: Refer-To contains ISC#3 URI; method=invite
  Referred-By contains ISC#1 URI
REFER 2: Refer-To contains ECT Session Identifier URI; method=invite
  Referred-By contains ISC#1 URI
INVITE 3: Request URI = ECT Session Identifier URI
INVITE 4: Request URI = ISC#3 URI
NOTIFY(100): Event contains refer
  message/sipfrag contains SIP/2.0 100 Trying
NOTIFY(200): Event contains refer
  message/sipfrag contains SIP/2.0 200 OK
Comments:
ISC#1 AS Transferor ISC#2 ISC#3
Establishment of session #1

INVITE INVITE 1
180 Ringing  180 Ringing
200 OK (INVITE)  200 OK (INVITE)
ACK  ACK


INVITE 2 (sendonly) INVITE (sendonly)

200 OK (recvonly) 200 OK (recvonly)
ACK  ACK
ISC#1 transfers ISC#2 to ISC#3

REFER 1 REFER
  REFER 2

 202 Accepted 202 Accepted
202 Accepted 202 Accepted
BYE  BYE

200 OK (BYE) 200 OK (BYE)

NOTIFY(100)  NOTIFY(100)

200 OK NOTIFY 200 OK NOTIFY
 INVITE INVITE 3
 INVITE 4  INVITE

 180 Ringing 180 Ringing
 180 Ringing 180 Ringing
 200 OK  200 OK
 200 OK 200 OK
  ACK ACK

NOTIFY(200) NOTIFY(200)

200 OK NOTIFY 200 OK NOTIFY
  Communication ISC#2 with ISC#3

 BYE BYE 2
 BYE  BYE
 200 OK (BYE)  200 OK (BYE)

 200 OK (BYE) 200 OK (BYE)


ETSI

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13 ETSI TS 186 015-2 V2.1.1 (2009-07)
TSS TP Reference Selection expression
Netw/TransferorAS ECT_N01_005 4.5.2.4 [1] PICS 1/3 AND
NOT (PICS 1/4 OR PICS 1/5)
Test purpose
Communication transfer: Consultative transfer. Transferor was originator of the originating call.
Ensure that a Transferor can successfully transfer the communication with the transferee set on hold before and
the Transferor is notified about the processing. The Transferor has a session with Transferee and the Transfer
target set on hold. The Transferor refers the Transferee to establish a session to the Transfer target. After the
successful session between Transferee and Transfer target, the sessions of the Transferor are released by the
Transferor. The Transferor was the initiator of the originating communication.
SIP header values:
REFER 1: Require=replaces; Refer-To contains ISC#3 URI?Replaces=call-id1%3B
  to-tag=S1%3Bfrom-tag=S1; method=invite
  Referred-By contains ISC#1 URI
REFER 2: Require=replaces; Refer-To contains ECT Session Identifier URI?Replaces=call-id1%3B
  to-tag=S1%3Bfrom-tag=S1; method=invite
  Referred-By contains ISC#1 URI
INVITE 3: Request URI = ECT Session Identifier URI; Replaces=call-id1;to-tag=S1; from-tag=S1
INVITE 4: Request URI = ISC#3 URI; Replaces=call-id1;to-tag=S1;from-tag=S1
NOTIFY(100): Event contains refer;
  message/sipfrag contains SIP/2.0 100 Trying
NOTIFY(200): Event contains refer;
  message/sipfrag contains SIP/2.0 200 OK
Comments:
ISC#1 AS Transferor ISC#2 ISC#3
Establishment of session #1
INVITE 1  INVITE
180 Ringing  180 Ringing

200 OK (INVITE) 200 OK (INVITE)

ACK ACK


INVITE (sendonly) INVITE (sendonly)
200 OK (recvonly)  200 OK (recvonly)
ACK  ACK
Establishment of session #2

INVITE 2   INVITE
180 Ringing   180 Ringing

200 OK (INVITE)  200 OK (INVITE)
ACK   ACK
ISC#1 transfers ISC#3 to ISC#2

REFER 1 REFER
 REFER 2 REFER
 202 Accepted 202 Accepted

202 Accepted 202 Accepted
INVITE (inactive)  INVITE (inactive)
200 OK (inactive)  200 OK (inactive)
ACK  ACK


NOTIFY(100) NOTIFY(100)

200 OK NOTIFY 200 OK NOTIFY
 INVITE INVITE 3

 INVITE 4 INVITE
 180 Ringing  180 Ringing
 180 Ringing 180 Ringing

 200 OK 200 OK
 200 OK 200 OK
  ACK ACK

NOTIFY(200) NOTIFY(200)
200 OK NOTIFY  200 OK NOTIFY


BYE  BYE
200 OK (BYE)   200 OK (BYE)

ETSI

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14 ETSI TS 186 015-2 V2.1.1 (2009-07)
TSS TP Reference Selection expression
Netw/TransferorAS ECT_N01_005 4.5.2.4 [1] PICS 1/3 AND
NOT (PICS 1/4 OR PICS 1/5)
BYE   BYE

200 OK (BYE)  200 OK (BYE)
  Communication ISC#2 with ISC#3
 BYE  BYE 2

 BYE BYE
 200 OK (BYE)  200 OK (BYE)
 200 OK (BYE) 200 OK (BYE)


TSS TP Reference Selection expression
Netw/TransferorAS ECT_N01_006 4.5.2.4 [1] PICS 1/3 AND
NOT (PICS 1/4 OR PICS 1/5)
Test purpose
Communication transfer: Consultative transfer. Transferee was originator of the originating call.
Ensure that a Transferor can successfully transfer the communication with the transferee set on hold before and
the Transferor is notified about the processing. The Transferor has a session with Transferee and the Transfer
target. The Transferor refers the Transferee to establish a session to the Transfer target. After the successful
session between Transferee and Transfer target set on hold, the sessions of the Transferor are released by the
Transferor. The Transferee was the initiator of the originating communication.
SIP header values:
REFER 1: Require=replaces; Refer-To contains ISC#3 URI?Replaces=call-id1%3B
  to-tag=S1%3Bfrom-tag=S1; method=invite
  Referred-By contains ISC#1 URI
REFER 2: Require=replaces; Refer-To contains ECT Session Identifier URI?Replaces=call-id1%3B
  to-tag=S1%3Bfrom-tag=S1; method=invite
  Referred-By contains ISC#1 URI
INVITE 3: Request URI = ECT Session Identifier URI; Replaces=call-id1; to-tag=S1; from-tag=S1
INVITE 4: Request URI = ISC#3 URI; Replaces=call-id1;to-tag=S1; from-tag=S1
NOTIFY(100): Event contains refer
  message/sipfrag contains SIP/2.0 100 Trying
NOTIFY(200): Event contains refer
  message/sipfrag contains SIP/2.0 200 OK
Comments:
ISC#1 AS Transferor ISC#2 ISC#3
Establishment of session #1
INVITE  INVITE 1

180 Ringing 180 Ringing
200 OK (INVITE)  200 OK (INVITE)

ACK ACK

INVITE (sendonly)  INVITE (sendonly)
200 OK (recvonly)  200 OK (recvonly)
ACK  ACK
Establishment of session #2

INVITE 2  INVITE
180 Ringing   180 Ringing
200 OK (INVITE)   200 OK (INVITE)

ACK  ACK
ISC#1 transfers ISC#2 to ISC#3
REFER 1 REFER

  REFER 2
 202 Accepted 202 Accepted
202 Accepted 202 Accepted

INVITE (inactive) INVITE (inactive)
200 OK (inactive)  200 OK (inactive)
ACK  ACK

NOTIFY(100)  NOTIFY(100)

200 OK NOTIFY 200 OK NOTIFY

 INVITE INVITE 3
 INVITE 4  INVITE
 180 Ringing  180 Ringing
 180 Ringing 180 Ringing
 200 OK  200 OK
ETSI

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15 ETSI TS 186 015-2 V2.1.1 (2009-07)
TSS TP Reference Selection expression
Netw/TransferorAS ECT_N01_006 4.5.2.4 [1] PICS 1/3 AND
NOT (PICS 1/4 OR PICS 1/5)
 200 OK 200 OK

  ACK ACK
NOTIFY(200)  NOTIFY(200)
200 OK NOTIFY  200 OK NOTIFY

BYE   BYE
200 OK (BYE)   200 OK (BYE)

BYE BYE
200 OK (BYE)  200 OK (BYE)
  Communication ISC#2 with ISC#3

 BYE BYE 2
 BYE  BYE

 200 OK (BYE) 200 OK (BYE)
 200 OK (BYE) 200 OK (BYE)


TSS TP Reference Selection expression
Netw/TransferorAS ECT_N01_007 4.5.2.4.1.2.2 [1]
Test purpose
The method in the Refer-To header is not the INVITE method.
Ensure that the REFER request is rejected if the Method in the Refer-To header used in this dialogue is not the
INVITE method e.g. BYE.
SIP header values:
REFER: :Refer-To contains ISC#3 URI; method=BYE
  Referred-By contains ISC#1 URI
Comments:
ISC#1 AS Transferor ISC#2 ISC#3
Establishment of session #1

INVITE  INVITE
180 Ringing  180 Ringing

200 OK (INVITE) 200 OK (INVITE)
ACK  ACK


INVITE (sendonly) INVITE (sendonly)
200 OK (recvonly)  200 OK (recvonly)
ACK  ACK
ISC#1 transfers ISC#2 to ISC#3
REFER REFER

4xx
...