Proposed New HIS on NGN interoperability

1. Global Standards Collaboration (GSC) 14 Proposed New HIS on NGN interoperability Hajime KOTO The Telecommunication Technology Committee (TTC) as Prime PSO for NGN interoperability

2. Abstract Resolution 76 “Studies related to conformance and interoperability testing, assistance to developing countries, and a possible future ITU Mark programme” which was approved in WTSA08(Johannesburg, 2008) instructs to take actions to all ITU-T Study Groups to improve NGN interoperability and encourages national and regional test entities to assist ITU-T in implementing this Resolution. "NGN Interoperability“ has been approved as a new HIS for GSC. TTC was assigned as Prime PSO for this subject. To support ITU-T activity, this paper describes several solutions to achieve NGN interoperability and propose collaborative direction in GSC.

3. There are several solutions to achieve NGN interoperability. These solutions are not exclusive but complementary. Level 1 Specify detailed protocol specifications Level 2 Specify test Specifications (e.g. PICS，PICSIT, Implementation agreements etc ) Level 3 Interoperability testing and/or conformance testing How to achieve NGN interoperability?

4. The ways to NGN interoperability Detailed Protocol Specifications Implementation agreements Compatibility with products Recommendation Way to Interoperability Testing Certification by the authority Test Specifications WP4/SG11 all WPs/SG11 Way to Conformance Testing Level 1 Level 2 Level 3

5. The way to Conformance Testing Scope of Conformance testing Test subject is connected to the tester or reference machine and examines the conformity with reference recommendations. Certifications maybe given to the products passed by the testing authority. The documents which describe test specifications for the conformance testing are specified in the test specification language such as PICS, PICSIT etc. More detailed protocol recommendations can make deeper test specifications and deeper examination of the protocols. General configuration for Conformance testing Test Subject (Product) Tester e.g. UNI/NNI

6. The way to Interoperability Testing Scope of Interoperability testing Multiple products of multiple vendors are connected and tested for interoperability at the service level and/or transport level. Interoperability testing will be conducted in the following steps, Define service scenario (service use case). Define configuration, products and interfaces to be tested. Defineimplementation agreements for each test interface. Examine interoperability tests according to the test scenario and implementation agreement and analyze the test output. The documents for Interoperability testing are composed of service scenario (service use case) and implementation agreements for each test interfaces. The items which are supplemented in the implementation agreement will be decreased if protocol recommendations are more detailed and more exhaustive examination according to the recommendation can be done. Interoperability testing (e.g. IOT configuration for IMS based IPTV) VendorA IPTV-AS Vendor B UE IMS IPTV-VS Test interface QoS/Router

7. Discussion on the Level1 solution Develop additional or supplement documents to specify more detailed protocol behavior to assureinteroperability. TTC specifies JT-Q3401 NGN NNI signalling profile which is based on the ITU-T Recommendation Q.3401. This document includes national specifications in the annexes and appendixes to assure interoperability among Japan national carriers. Pros. There are many options to use SIP protocol. Guidance on how to choose and set the options of SIP must be defined for interoperability. More detailed protocol recommendations can achieve the full NGN interoperability. Cons. Many products in the market have already been implemented. It is difficult to specify details after products have been introduced into the market. Obtaining consensus is time consuming.

8. Level1 e.g. NGN NNI/UNI signalling profile Scope of NGN NNI/UNI signalling profile documents These documents specify the service layer profile:the specifications for the SIP/SDP interface at the UNI and NNI. Transport layer profiles such as RTP are specified if media information is included in the service layer signalling. Interface in the scope of the NNIdocument Logical Interface Service Control Function Service Control Function Interface in the scope of the UNIdocument Interface in the scope of the UNIdocument VoIP Service Provider A VoIP Service Provider B Transport Function Transport Function IP telephony IP telephony SS7 MG MG SS7 Bearer (RTP/IP) Signalling (SIP) PSTN PSTN

9. Level1 e.g. JT-Q3401 NGN NNI signalling profile JT-Q3401 aims to assure interoperability amongst VoIP service providers in Japan. This document is developed based on the ITU-T Recommendation Q.3401 NGN NNI signalling profile and TTC addingthe TTC specifications (national standard) in the annexes and appendixes. ITU-T Rec. TTC Standard Q.3401 (ITU-T) JT-Q3401 (TTC) SIP Signalling profile Call Signalling flow SIPSignalling profile Call Signalling flow P1-43 Translation + TTC additional Specifications Supplement technical documents Annex a. Clarifications of the JT-Q3401 text and option items Annex b. Parameter setting of SIP message Annex c. Originating number indication Annex d. SDP non transparency in the Early dialogue Annex e. Null member talkie Annex f. Originating user identification Annex g. Congestion control Annex h. Numbering SIP-ISUP interwork Appendix i. Fall back connection Appendix ii. TCP transport connection at the NGN-NGN interface Appendix iii. ISUP->SIP interwork for number portability Appendix iv. Option list Appendix v. SIP message and header information Appendix vi. Message examples P44-127

10. Level1 e.g. JT-Q3402 NGN UNI signalling profile JT-Q3402 aims to assureinteroperability of the multimedia communications between NGN and terminals such as SIP telephony, SIP IP-PBX and SIP residential GW. This document is developed based on the ITU- T Recommendation Q.3402 NGN UNI signalling profile and TTC adding the TTC specifications (national standard) in the annexes and appendixes. ITU-T Rec. TTC Standard Q.3402 (ITU-T) JT-Q3402 (TTC) SIP Signalling profile Call Signalling flow SIPSignalling profile Call Signalling flow P1-58 Translation + TTC additional Specifications Supplement technical documents Annex a. Clarifications of the JT-Q3402 text and option items Annex b. Originating number indication and relevant header Annex c. Terminal registration Annex d. SIP capability exchange Annex e. SIP and media handling Annex f. Congestion control Annex g. Band width control Annex h. Character length and parameter range of SIP message Annex i,. Specifications for the behavior of voice terminal Appendix i. Option items list Appendix ii. Use of response code Appendix iii. Mapping to the quality class with SDP description Appendix iv. Security Appendix v. SCF address acquisition Appendix vi. SIP message and header information Appendix vii. Message examples P59-161 10

11. Discussion on the Level2 solution • Around 40 draft test specification recommendations are being studied under WP4/11. These documents should be promoted by SG11 to achieve better conformance testing. • The following should be taken into consideration: • Priority of study and area of study should respect the requirements from developing countries. • Each fora and regional SDO should reflect their output by submitting their specifications to ITU-T.

12. Discussion on the Level3 solution Two ideas on how to set up of test facilities: construct new test facilities of ITU-T and/or globally connect regional SDO test facilities (ie., CJK, ETSI TISPAN). Fora, SDOs and regional/national organizations have already conducted various test events (E.g. TISPAN Plug test, MSF/GMI event, HATS in Japan etc). Harmonization and collaboration between them should be considered. Pros. This is the most comprehensive method to assure the product interoperability. Cons. There were many questions and comments raised such as who provides the testing facilities, where is the test location and how long, how frequent and how deep? Associated costs to test are high.

13. Proposed Strategic Collaborative Direction in GSC (Resolutions) • to exchange and share the information among PSOs which have already good experience in assuring NGN interoperability. • to participate positively in the ITU-T SG11 mini-workshop which is scheduled during the NGN-GSI event in September, to assist ITU-T to promote NGN interoperability and initiate the required actions. • to encourage the PSOs to submit contribution to the relevant ITU-T study groups including SG11 to promote the discussion on NGN interoperability in ITU-T.

14. Proposed Strategic Collaborative Direction in GSC (Resolutions) • to encourage the PSOs and ITU-T to study and discuss their future roles in NGN conformance testing and NGN interoperability testing . • to encourage the PSOs and the related Fora/Consortia to discuss the establishment of the framework for NGN conformance testing and NGN interoperability testing to be prepared in order that the conformance to ITU-T NGN Recommendation can be tested.

15. Supplementary Slides

16. Resolution 76 approved in WTSA08 Studies related to conformance and interoperability testing, assistance to developing countries[1], and a possible future ITU Mark programme(Johannesburg, 2008) The World Telecommunication Standardization Assembly (Johannesburg, 2008), [1] These include the least developed countries, small island developing states and countries with economies in transition.

17. Resolution 76 approved in WTSA08 recognizing a) that interoperability of international telecommunication networks was the main reason to create ITU in the year 1865 (International Telegraph Union), and that this remains one of the main goals in the ITU strategic plan; b) that conformity assessment is the accepted way of demonstrating that a product adheres to an international standard and is increasingly important in the context of World Trade Organization members' international standardization commitments under the Agreement on Technical Barriers to Trade; c) that Recommendations ITU-T X.290 to X.296 specify a general methodology for conformance testing of equipment to Recommendations of the ITU Telecommunication Standardization Sector (ITU-T); d) that conformance testing would increase the chance of interoperability of equipment conforming to ITU standards; e) that very few of the current ITU-T Recommendations identify interoperability or conformance testing requirements; Items from f) to J) are omitted in this slide.

18. Resolution 76 approved in WTSA08 considering a) that there is an increasing number of complaints that equipment is often not fully interoperable with other equipment; b) that some countries, especially the developing countries, have not yet acquired the capacity to test equipment and provide assurance to consumers in their countries; c) that increased confidence in the conformance of information and communication technologies (ICT) equipment with ITU-T Recommendations would increase the chances of end-to-end interoperability of equipment from different manufacturers, and would assist developing countries in the choice of solutions,

19. Resolution 76 approved in WTSA08 resolves 1 that ITU-T study groups develop the necessary conformance testing Recommendations for telecommunication equipment as soon as possible; 2 that ITU-T Recommendations to address interoperability testing shall be progressed as quickly as possible; 3 that ITU-T, in collaboration with the other Sectors as appropriate, shall develop a programme to: assist developing countries in identifying human and institutional capacity-building and training opportunities in conformity and interoperability testing; assist developing countries in establishing regional or subregional conformity and interoperability centres suitable to perform conformity and interoperability testing as appropriate; 4 that conformance and interoperability testing requirements shall provide for verification of the parameters defined in the current and future ITU-T Recommendations for telecommunication/ICT equipment and services, and for interoperability testing to ensure full compatibility,

20. Resolution 76 approved in WTSA08 Instructs the study groups To identify as soon as possible existing and future ITU-T Recommendations that would be candidates for interoperability, taking into account the needs of the membership (e.g. interoperability of NGN equipment, terminals, audio/video codecs, access and transport network), that are capable of providing end-to-end interoperable services on a global scale, adding to their content, if necessary, specific requirements within their scope To prepare those ITU-T Recommendations, identified in instructs the study groups 1 above, with a view to conducting conformity and interoperability tests as appropriate,

21. Resolution 76 approved in WTSA08 invites Member States and Sector Members • to contribute to the implementation of this resolution; • to encourage national and regional testing entities to assist ITU-T in implementing this resolution.