A.1 ACR termination towards UE-B

24.4113GPPProtocol specificationPSTN/ISDN simulation services: Anonymous Communication Rejection (ACR) and Communication Barring (CB)Release 8TISPANTS

Figure A.1.1: ACR termination towards UE-B

1 to 2. INVITE (UE to S-CSCF) – see example in figure A.1.1.

The incoming INVITE request is sent to the S-CSCF serving UE-B. The INVITE includes a Privacy header field set to one of the following values: "id" or "header" or "user".

3. Evaluation of initial filter criteria.

The initial Filter criteria indicates that the called user is subscribed to the ACR service. Therefore the S-CSCF forwards the INVITE to the ACR AS.

4 to 5. INVITE (S-CSCF to AS) – see example in figure A.1.1.

INVITE is sent to the AS.

6 to 8. 433 (Anonymity Disallowed) response. (AS to UE) – see example in figure A.1.1.

AS has identified that the call is anonymous and answers with a 433 (Anonymity Disallowed) response.

9 to 10. The originating party acknowledges the final response with ACK.

Annex B (informative):
Example of filter criteria

This annex provides an example of a filter criterion that triggers SIP requests that are subject to initial filter criteria evaluation.

When the initial request matches the conditions of the next unexecuted IFC rule for the served user which points to the ACR service and the P-Asserted-Identity header is set to "id", "header" or "user" or "critical", the communication is forwarded to the AS.

An example of an Initial Filter Criteria (IFC) Trigger Point configurations under the assumption that the ACR service is a standalone service that can be invoked by a very specific triggerpoint active at the destination S-CSCF:

  • (Method="INVITE" AND [Header="P-Asserted-Identity"] AND [Header="Privacy", Content="id"]); or
  • (Method="INVITE" AND [Header="P-Asserted-Identity"] AND [Header="Privacy", Content="header"]); or
  • (Method="INVITE" AND [Header="P-Asserted-Identity"] AND [Header="Privacy", Content="user"]); or
  • (Method="INVITE" AND [Header="P-Asserted-Identity"] AND [Header="Privacy", Content="critical"]).

NOTE 1: The coding of the Initial Filter Criteria is described in TS 183 033 [12].

NOTE 2: In this case there is a one to one relationship with the conditions that express the rejection cases for the ACR service as specified in clause 4.5.2.6.1 "Action for ACR at the terminating AS".

NOTE 3: In practice it is more likely that all Invite’s are forwarded to the AS, because there is more services to execute then ACR alone. This is already apparent when the combined service ACR/ICB is deployed.

Annex C (informative):
Change history

Change history

Date

TSG #

TSG Doc.

CR

Rev

Subject/Comment

Old

New

2006-03

Publication as ETSI TS 183 011

1.1.1

2007-03

Publication as ETSI TS 183 011

1.2.1

2008-01

Publication as ETSI TS 183 011

1.3.0

2008-01

Convertsion to 3GPP TS 24.411

1.3.1

2008-03

CT#39

CP-080088

Version 1.3.1 approved as CP-080088 and version 7.0.0 created by MCC for publication

1.3.1

7.0.0

2008-03

Based on the decision in CT#39, version 8.0.0 created by MCC

7.0.0

8.0.0

2008-06

CT#40

CP-080350

0002

Revision of references to documents from IETF SIP working group

8.0.0

8.1.0

2011-09

CT#53

CP-110657

0005

<conditions> element values

8.1.0

8.2.0

2011-12

CT#54

CP-110857

0007

2

Use of "Critical"

8.2.0

8.3.0