TR 33.838
Study on PUCI (Protection against Unsolicited Communication for IMS)

V11.0.0 (Wzip) 2012/03 21 p.

full Table of Contents for TR 33.838 Word version: 11.0.0

each clause number in 'red' refers to the equivalent title in the Partial Content

Scope p. 5

References p. 5

Definitions, abbreviations p. 6

3.1	Definitions p. 6
3.2	Abbreviations p. 6

Definition of PUCI scope p. 7

4.1	Communication modes p. 7
4.2	Bulk communications vs targeted communications p. 7

Design principles and security requirements p. 8

5.1	Design principles p. 8
5.2	Security requirements p. 8

Preventive measures p. 9

Introduction p. 9

Non-technical prevention measures p. 9

6.2.1	General p. 9
6.2.2	Legislation p. 9
6.2.3	Contractual agreements between operators and their customers p. 9
6.2.4	Contractual agreements between different operators (SLAs) p. 10

Technical prevention measures p. 10

Interworking with non-IMS systems p. 11

Background p. 11

IETF Work on SIP Peering p. 11

Operator SPIT/UC interworking and source identification p. 11

7.1.2.1	Introduction p. 11
7.1.2.2	Interworking between mutually trusting VoIP operators p. 12

PUCI architectural considerations p. 14

Overview p. 14

PUCI information storage p. 14

PUCI function invocation p. 14

Compatibility with IMS centralized services, SRVCC, and service continuity p. 15

8.4.1	General p. 15
8.4.2	Mechanisms based on supplementary services p. 15
8.4.3	IMR p. 15

Solution alternatives p. 15

9.1	High level architecture p. 15

PUCI information exchange p. 16

10.1	PUCI information type and structure p. 16
10.2	PUCI information signalling p. 17
10.3	PUCI function communication p. 19
10.4	PUCI user notification p. 20

Conclusions and recommendations p. 20

Change history p. 21