1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T Q.3951 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (06/2015) SERIES Q: SWITCHING AND SIGNALLING Signalling requirements and protocols for the NGN Testing for next generation networks Real-time Internet Protocol based on
2、 the ITU-T T.38 supporting facsimile service testing framework at the user-to-network interface of next generation networks Recommendation ITU-T Q.3951 ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE Q.1Q.3 INTERNATIONAL AUTOMATIC AND SEMI-AUTOM
3、ATIC WORKING Q.4Q.59 FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN Q.60Q.99 CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS Q.100Q.119 SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4, 5, 6, R1 AND R2 Q.120Q.499 DIGITAL EXCHANGES Q.500Q.599 INTERWORKING OF SIGNALLING SYSTEMS Q.600Q.699 SPECIFICATI
4、ONS OF SIGNALLING SYSTEM No. 7 Q.700Q.799 Q3 INTERFACE Q.800Q.849 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 Q.850Q.999 PUBLIC LAND MOBILE NETWORK Q.1000Q.1099 INTERWORKING WITH SATELLITE MOBILE SYSTEMS Q.1100Q.1199 INTELLIGENT NETWORK Q.1200Q.1699 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000
5、Q.1700Q.1799 SPECIFICATIONS OF SIGNALLING RELATED TO BEARER INDEPENDENT CALL CONTROL (BICC) Q.1900Q.1999 BROADBAND ISDN Q.2000Q.2999 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR THE NGN Q.3000Q.3999 General Q.3000Q.3029 Network signalling and control functional architecture Q.3030Q.3099 Network data or
6、ganization within the NGN Q.3100Q.3129 Bearer control signaling Q.3130Q.3179 Signalling and control requirements and protocols to support attachment in NGN environments Q.3200Q.3249 Resource control protocols Q.3300Q.3369 Service and session control protocols Q.3400Q.3499 Service and session control
7、 protocols supplementary services Q.3600Q.3649 NGN applications Q.3700Q.3849 Testing for next generation networks Q.3900Q.3999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T Q.3951 (06/2015) i Recommendation ITU-T Q.3951 Real-time Internet Protocol based on the IT
8、U-T T.38 supporting facsimile service testing framework at the user-to-network interface of next generation networks Summary Recommendation ITU-T Q.3951 describes the real-time Internet Protocol (IP) based on the ITU-T T.38 supporting facsimile service testing framework at the user-to-network interf
9、ace (UNI) in next generation networks (NGNs). This Recommendation defines the preparation for NGN multimedia service testing, physical configuration, test scenarios and test report production. The real-time IP based on the ITU-T T.38 supporting facsimile service defined in this Recommendation covers
10、 services including facsimile (ITU-T T.38) and voice over IP (ITU-T G.711) communication. The test check sheets described in clause 7.1 are useful for NGN operators, service providers and vendors when testing their services or products. History Edition Recommendation Approval Study Group Unique ID*
11、1.0 ITU-T Q.3951 2015-06-13 11 11.1002/1000/12501 _ * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T Q.3951 (06/2015) FOREWORD
12、 The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying tec
13、hnical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which
14、, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and I
15、EC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to e
16、nsure, e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words d
17、oes not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTSITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerni
18、ng the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by paten
19、ts, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2015 All rights reserved. No part of this public
20、ation may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T Q.3951 (06/2015) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation . 2 4 Abbreviations and acronyms 2
21、 5 Conventions 3 6 Preparation for testing . 3 6.1 Test object 3 6.2 Target interface . 4 6.3 Target Recommendation 4 6.4 Physical configuration 5 6.5 Test scenarios of NIT . 5 6.6 Test scenario of facsimile interoperability testing of the end-to-end service . 11 7 Analysis of test results 13 7.1 Te
22、st report production 13 Appendix I The applicable testing items for ITU-T Q.3945 (The types and list of NGN services testing on the model networks. Test set 1) 16 Rec. ITU-T Q.3951 (06/2015) 1 Recommendation ITU-T Q.3951 Real-time Internet Protocol based on the ITU-T T.38 supporting facsimile servic
23、e testing framework at the user-to-network interface of next generation networks 1 Scope This Recommendation describes the real-time IP based on the ITU-T T.38 supporting facsimile service testing framework at the UNI in NGNs. This Recommendation defines the preparation for NGN multimedia service te
24、sting, physical configuration, test scenarios and test report production. The real-time IP based on the ITU-T T.38 supporting facsimile service defined in this Recommendation covers services including facsimile (ITU-T T.38) and voice over IP (ITU-T G.711) communication. The test check sheets describ
25、ed in clause 7.1 are useful for NGN operators, service providers and vendors when testing their services or products. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the t
26、ime of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below.
27、A list of the currently valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T T.30 Recommendation ITU-T T.30 (2005), Procedures document facsimile transmission in t
28、he general switched telephone network. ITU-T G.711 Recommendation ITU-T G.711 (1984), Pulse code modulation (PCM) of voice frequencies. ITU-T Q.3402 Recommendation ITU-T Q.3402 (2008), NGN UNI signalling profile (Protocol set 1). ITU-T Q.3903 Recommendation ITU-T Q.3903 (2008), Formalized presentati
29、on of testing results. ITU-T Q.3945 Recommendation ITU-T Q.3945 (2011), Test specifications for next generation network services on model networks Test set 1. ITU-T T.38 Recommendation ITU-T T.38 (2010), Procedures for real-time Group 3 facsimile communication over IP networks. ITU-T V.152 Recommend
30、ation ITU-T V.152 (2010), Procedures for supporting voice-band data over IP networks. ITU-T Y.2012 Recommendation ITU-T Y.2012 (2010), Functional requirements and architecture of next generation networks. IETF RFC 3261 IETF RFC 3261 (2002), SIP, Session Initiation Protocol. IETF RFC 3262 IETF RFC 32
31、62 (2002), Reliability of Provisional Responses in Session Initiation Protocol (SIP). IETF RFC 3264 IETF RFC 3264 (2002), An Offer/Answer Model with Session Description Protocol (SDP). 2 Rec. ITU-T Q.3951 (06/2015) IETF RFC 3311 IETF RFC 3311 (2002), The Session Initiation Protocol (SIP) UPDATE Meth
32、od. IEFT RFC 3550 IETF RFC 3550 (2003), RTP, A Transport Protocol for Real-Time Applications. IETF RFC 3551 IETF RFC 3551 (2003), RTP Profile for Audio and Video Conferences with Minimal Control. IETF RFC 3362 IETF RFC 3362 (2002), Real-time Facsimile (T.38) image/t38 MIME Sub-type Registration. IET
33、F RFC 4028 IETF RFC 4028 (2005), Session Timers in the Session Initiation Protocol (SIP). IETF RFC 4145 IETF RFC 4145 (2005), TCP-Based Media Transport in the Session Description Protocol (SDP). IETF RFC 4245 IETF RFC 4245 (2005), High-Level Requirements for Tightly Coupled SIP Conferencing. IETF RF
34、C 4566 IETF RFC 4566 (2006), SDP: Session Description Protocol. IETF RFC 6416 IETF RFC 6416 (2011), RTP Payload Format for MPEG-4 Audio/Visual Streams. IETF RFC 6466 IETF RFC 6466 (2011), IANA Registration of the image Media Type for the Session Description Protocol (SDP). 3 Definitions 3.1 Terms de
35、fined elsewhere None. 3.2 Terms defined in this Recommendation None. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: IAF Internet Aware Facsimile NGN Next Generation Network NIT Network Integration Test NUT Network Under Test QoS Quality of Service RTC
36、P RTP Control Protocol RTP Real-Time Transport Protocol SDP Session Description Protocol SIP Session Initiation Protocol TCP Transmission Control Protocol UA User Agent Rec. ITU-T Q.3951 (06/2015) 3 UDP User Datagram Protocol UNI User-to-Network Interface 5 Conventions None. 6 Preparation for testin
37、g 6.1 Test object Test objects used in IP based on the facsimile service are specified within multiple ITU-T Recommendations and other standards development organization (SDO) documents, as referenced in this Recommendation. Figure 6-1 shows the block diagram for an IP based on the facsimile communi
38、cation terminal. Dual-mode facsimile has capability of facsimile over IP supporting ITU-T T.38, and voice supporting ITU-T G.711 communication. Q . 3 9 5 1 (1 5 )_ F 6 -1N ex t g en er at i o n n et w o rk s(N G N )V o IP g at ew ayD u al -m o d efa cs i mi l eIA F (I n t er n etaw ar e fa cs i mi l
39、 e)Figure 6-1 IP based on the facsimile communication terminal Test profiles should include a list of Recommendations related to the test object of IP based on the facsimile service testing. Table 6-1 shows the coding schemes and profiles for an IP based on the facsimile communication terminal. Tabl
40、e 6-1 IP based on the facsimile communication terminal coding schemes and profiles Item VoIP protocol Facsimile protocol Session control Session initiation protocol (SIP) (RFC 3261), session description protocol (SDP) (RFC 4566) Capability exchange RFC 3264 RFC 3362, RFC 6466 SIP extensions RFC 3262
41、 (Reliability of provisional responses) RFC 3311 (UPDATE) RFC 4028 (Session timers) Media transfer Real-time transport protocol (RTP) (RFC 3550, RFC 3551), RTCP (RFC 3550 option) RFC 3551 Packetization mode (RFC 6416) Transmission control protocol (TCP) mode (RFC 4145) 4 Rec. ITU-T Q.3951 (06/2015)
42、Table 6-1 IP based on the facsimile communication terminal coding schemes and profiles Item VoIP protocol Facsimile protocol Facsimile None ITU-T T.38 (Real-time facsimile) Audio ITU-T G.711 /a-Law ITU-T T.38 (Option: ITU-T V.152 VBD) 6.2 Target interface The UNI, shown in the lower left of Figure 6
43、-2, is the target interface for the IP, based on the facsimile service testing, described in this Recommendation. NOTE Figure 6-2 is an exact replica of Figure 7-1 of ITU-T Y.2012. Figure 6-2 UNI as the target interface (ITU-T Y.2012 NGN architecture overview) 6.3 Target Recommendation ITU-T Q.3402
44、defines the NGN UNI signalling profile (protocol set 1) and is the target Recommendation for the multimedia service testing described in this Recommendation. In this Recommendation, the testing terminals are Internet aware facsimiles (IAFs) or ITU-T T.38 supporting terminals connected to IP based ne
45、twork. Rec. ITU-T Q.3951 (06/2015) 5 6.4 Physical configuration The physical configuration for multimedia service testing should define the functions needed for service testing. However, the physical configuration may depend on the target protocol. This clause shows the test configuration for two te
46、st cases of network under test (NUT): The network integration test (NIT) test case, and the interoperability testing of the end-to-end service test case. Figure 6-3 shows one case of the general configuration of NIT for the multimedia service testing at UNI. In this figure, the reference machine is
47、similar to the network. Figure 6-4 shows one case of the general configuration of multimedia interoperability testing of the end-to-end service. Figure 6-3 General configuration case of NIT for multimedia service testing Figure 6-4 General configuration case of multimedia interoperability testing of
48、 the end-to-end service 6.5 Test scenarios of NIT The following is an example of the NIT for multimedia service testing at UNI. 6.5.1 Test items The following are several example test items: a) terminal registration; b) negotiating SIP capabilities; c) audio and facsimile data behaviour of the termi
49、nal. Refer to Table 6-2 for details. Table 6-2 List of sequences of NIT No. Sequence name 1 Terminal registration 2 Call sending and call receiving 3 Audio communication and facsimile communication 4 Update of session timer 5 Call disconnection 6 Deletion of terminal registration 6 Rec. ITU-T Q.3951 (06/2015) 6.5.2 Execution flow NGN service testing should be conducted in the following steps: 1) set the test object, target interface and target Recommenda
