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 Series Q TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Supplement 49 (02/2014) SERIES Q: SWITCHING AND SIGNALLING Signalling requirements to support IP telephony ITU-T Q-series Recommendations Supplement 49 ITU-T Q-SERIES
2、 RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE Q.1Q.3 INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC 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 SIGNA
3、LLING SYSTEMS No. 4, 5, 6, R1 AND R2 Q.120Q.499 DIGITAL EXCHANGES Q.500Q.599 INTERWORKING OF SIGNALLING SYSTEMS Q.600Q.699 SPECIFICATIONS 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 INTERW
4、ORKING WITH SATELLITE MOBILE SYSTEMS Q.1100Q.1199 INTELLIGENT NETWORK Q.1200Q.1699 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 Q.1700Q.1799 SPECIFICATIONS OF SIGNALLING RELATED TO BEARER INDEPENDENT CALL CONTROL (BICC) Q.1900Q.1999 BROADBAND ISDN Q.2000Q.2999 SIGNALLING REQUIREMENTS AND PROTO
5、COLS FOR THE NGN Q.3000Q.3999 For further details, please refer to the list of ITU-T Recommendations. Q series Supplement 49 (02/2014) i Supplement 49 to ITU-T Q-series Recommendations Signalling requirements to support IP telephony Summary Supplement 49 to the Q series of ITU-T Recommendations cons
6、ists of a technical report that specifies the signalling requirements to support IP telephony. IP telephony is defined as a service enabling the exchange of voice information primarily in the form of packets using Internet protocols (IP), while Internet telephony is defined as a particular applicati
7、on of the Internet, such that Internet telephony falls outside the scope of this Supplement. Network configurations are classified into four types (phone-to-phone, IP phone-to-phone, phone-to-IP phone and IP phone-to-IP phone) and the characteristics of each configuration are described using a gener
8、al example. The network capabilities needed to support IP telephony and interworking with legacy telephone networks are identified in this Supplement. Finally, the signalling requirements and control protocols needed to support IP telephony services in public networks are identified. History Edition
9、 Recommendation Approval Study Group Unique ID* 1.0 ITU-T Q Suppl. 49 2004-03-12 11 11.1002/1000/7274 2.0 ITU-T Q Suppl. 49 2014-02-21 11 11.1002/1000/12162 _ * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations
10、unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Q series Supplement 49 (02/2014) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Tel
11、ecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization
12、 Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, 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 technolog
13、y which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this publication, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with
14、 this publication is voluntary. However, the publication may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the publication is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language s
15、uch as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the publication is required of any party. INTELLECTUAL PROPERTY RIGHTSITU draws attention to the possibility that the practice or implementation of this publicatio
16、n may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the publication development process. As of the date of approval of th
17、is publication, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this publication. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database
18、at http:/www.itu.int/ITU-T/ipr/. ITU 2014 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Q series Supplement 49 (02/2014) iii Table of Contents Page 1 Scope . 1 2 Introduction . 1 3 References . 1 4 Abbreviati
19、ons and acronyms 6 5 Terms and definitions . 6 6 Network configurations for using IP telephony 7 6.1 Configuration A: Phone-to-phone communication (with IP transit network) 7 6.2 Configuration B-1: IP phone-to-phone communication . 7 6.3 Configuration B-2: Phone-to-IP phone communication . 8 6.4 Con
20、figuration C: IP phone-to-IP phone communication 8 7 Network capabilities to support IP telephony . 9 7.1 Service aspects 9 7.2 Charging considerations . 10 7.3 Quality of service (QoS) considerations . 10 7.4 User identification and addressing considerations . 11 7.5 Security considerations . 12 8
21、Network capabilities to support IP telephony interworking between the PSTN and the IP network . 12 9 Network address translation (NAT) and firewalls 14 10 Control protocols for support of IP telephony 14 Appendix I Supplementary services and the corresponding ITU-T Recommendations that define them 1
22、6 Appendix II Standard development related to IP telephony . 18 Appendix III J-series ITU-T Recommendations in support of IP telephony 21 Q series Supplement 49 (02/2014) 1 Supplement 49 to ITU-T Q-series Recommendations Signalling requirements to support IP telephony 1 Scope This Supplement identif
23、ies the network capabilities that must be satisfied to enable the support of IP telephony as well as interworking with legacy telephony networks. It identifies the relevant network configurations, the network functions required to support the IP telephony feature and the protocol stacks. 2 Introduct
24、ion The traffic characteristics of IP-based applications and of voiceband data communications generally, are significantly different from those of traditional speech communications upon which the engineering of the public switched telephone network (PSTN) has historically been based. Transaction-ori
25、ented traffic is handled inefficiently by the traditional PSTN, with the “call“ establishment time being at least of the same, and often of a greater, order of magnitude than the duration of the transactions themselves. This has particularly significance for “e-commerce“ applications. WTSA-2000 (Wor
26、ld Telecommunication Standardization Assembly, 2000) created a working group, (Question 7/11), to investigate approaches to signalling that efficiently directs these new traffic demands to (an) appropriately engineered network(s), while minimizing the potential for service degradation experienced by
27、 PSTN users. Furthermore, at WTPF-2001 (World Telecommunication Policy Forum, 2001), four opinions were adopted regarding the global introduction of IP telephony services. One of these opinions expressed a need to study the technical issues associated with interworking and the coexistence of the PST
28、N and IP-based networks to provide telephony services. This Supplement completes the study instigated by WTPF-2001 and explains the signalling needed to support IP telephony, provides example network configurations and identifies the capabilities that a network must have to support IP telephony. 3 R
29、eferences ITU-T E.106 Recommendation ITU-T E.106 (2003), International Emergency Preference Scheme (IEPS) for disaster relief operations. ITU-T E.107 Recommendation ITU-T E.107 (2007), Emergency Telecommunications Service (ETS) and interconnection framework for national implementations of ETS. ITU-T
30、 E.164 Recommendation ITU-T E.164 (1997), The international public telecommunication numbering plan. ITU-T E.370 Recommendation ITU-T E.370 (2001), Service principles when public circuit-switched international telecommunication networks interwork with IP-based networks. ITU-T G.107 Recommendation IT
31、U-T G.107 (2003), The E-Model, a computational model for use in transmission planning. ITU-T H.235 Recommendation ITU-T H.235 (2003), Security and encryption for H-series (H.323 and other H.245-based) multimedia terminals. ITU-T H.248 Recommendation ITU-T H.248 (2000), Gateway control protocol. 2 Q
32、series Supplement 49 (02/2014) ITU-T H.323 Recommendation ITU-T H.323 (2003), Packet-based multimedia communications systems. ITU-T H.450.1 Recommendation ITU-T H.450.1(2011), Generic functional protocol for the support of supplementary services in ITU-T H.323 systems. ITU-T H.450.2 Recommendation I
33、TU-T H.450.2 (2011), Call transfer supplementary service for ITU-T H.323 systems. ITU-T H.450.3 Recommendation ITU-T H.450.3 (2011), Call diversion supplementary service for ITU-T H.323 systems. ITU-T H.450.4 Recommendation ITU-T H.450.4 (2013), Call hold supplementary service for ITU-T H.323 system
34、s. ITU-T H.450.5 Recommendation ITU-T H.450.5 (2013), Call park and call pickup supplementary services for ITU-T H.323 systems. ITU-T H.450.6 Recommendation ITU-T H.450.6 (1999), Call waiting supplementary service for H.323. ITU-T H.450.7 Recommendation ITU-T H.450.7 (2013), Message waiting indicati
35、on supplementary service for ITU-T H.323 systems. ITU-T H.450.8 Recommendation ITU-T H.450.8 (2013), Name identification supplementary service for ITU-T H.323 systems. ITU-T H.450.9 Recommendation ITU-T H.450.9 (2000), Call completion supplementary services for H.323. ITU-T H.450.10 Recommendation I
36、TU-T H.450.10 (2001), Call offering supplementary services for H.323. ITU-T H.450.11 Recommendation ITU-T H.450.11 (2001), Call intrusion supplementary service for H.323. ITU-T H.450.12 Recommendation ITU-T H.450.12 (2001), Common Information Additional Network Feature for H.323. ITU-T H.450.x Recom
37、mendations ITU-T H.450.1 to ITU-T H.450.12 on supplementary services. ITU-T I.250 Recommendation ITU-T I.250 (1988), Definition of supplementary services. ITU-T I.251.1 Recommendation ITU-T I.251.1 (1992), Number Identification supplementary services: Direct dialling in. ITU-T I.251.2 Recommendation
38、 ITU-T I.251.2 (1992), Multiple Subscriber Number. ITU-T I.251.3 Recommendation ITU-T I.251.3 (1992), Calling Line Identification Presentation. ITU-T I.251.4 Recommendation ITU-T I.251.4 (1992), Calling Line Identification Restriction. ITU-T I.251.5 Recommendation ITU-T I.251.5 (1995), Connected Lin
39、e Identification Presentation (COLP). ITU-T I.251.6 Recommendation ITU-T I.251.6 (1995), Connected Line Identification Restriction (COLR). ITU-T I.251.7 Recommendation ITU-T I.251.7 (1992), Malicious call identification. ITU-T I.251.8 Recommendation ITU-T I.251.8 (1992), Sub-addressing supplementary
40、 service. Q series Supplement 49 (02/2014) 3 ITU-T I.252.1 Recommendation ITU-T I.252.1 (1988), Call Offering supplementary services: Call Transfer ITU-T I.252.2 Recommendation ITU-T I.252.2 (1992), Call Offering supplementary services: Call Forwarding Busy. ITU-T I.252.3 Recommendation ITU-T I.252.
41、3 (1992), Call Offering supplementary services: Call Forwarding No Reply. ITU-T I.252.4 Recommendation ITU-T I.252.4 (1992), Call Offering supplementary services: Call Forwarding Unconditional. ITU-T I.252.5 Recommendation ITU-T I.252.5 (1992), Call Offering supplementary services: Call Deflection.
42、ITU-T I.252.6 Recommendation ITU-T I.252.6 (1988), Call Offering supplementary services: Line Hunting (LH). ITU-T I.253.1 Recommendation ITU-T I.253.1 (1990), Call completion supplementary services: Call Waiting (CW) supplementary service. ITU-T I.253.2 Recommendation ITU-T I.253.2 (1992), Call comp
43、letion supplementary services: Call Hold. ITU-T I.253.3 Recommendation ITU-T I.253.3 (1996), Call completion supplementary services: Completion of calls to busy subscribers. ITU-T I.254.1 Recommendation ITU-T I.254.1 (1988), Multiparty supplementary services, Conference calling (CONF). ITU-T I.254.2
44、 Recommendation ITU-T I.254.2 (1992), Multiparty supplementary services, Three-Party Supplementary Service. ITU-T I.255.1 Recommendation ITU-T I.255.1 (1992), Community of Interest supplementary services: Closed User Group. ITU-T I.255.2 Recommendation ITU-T I.255.2 (1996), Community of Interest sup
45、plementary services: Support of Private Numbering Plans. ITU-T I.256.1 Recommendation ITU-T I.256.1 (1988), Charging supplementary services: Credit card calling (CRED). ITU-T I.256.2 Recommendation ITU-T I.256.2 (1993), Charging supplementary services: Advice of charge (AOC). ITU-T I.256.3 Recommend
46、ation ITU-T I.256.3 (1992), Charging supplementary services: Reverse charging. ITU-T I.257.1 Recommendation ITU-T I.257.1 (1995), Additional Information Transfer supplementary services: User-to-User Signalling (UUS). ITU-T J.160 Recommendation ITU-T J.160 (2005), Architectural framework for the deli
47、very of time-critical services over cable television networks using cable modems. ITU-T J.161 Recommendation ITU-T J.161 (2007), Audio codec requirements for the provision of bidirectional audio service over cable television networks using cable modems. ITU-T J.162 Recommendation ITU-T J.162 (2007),
48、 Network call signalling protocol for the delivery of time-critical services over cable television networks using cable modems. 4 Q series Supplement 49 (02/2014) ITU-T J.163 Recommendation ITU-T J.163 (2007), Dynamic quality of service for the provision of real-time services over cable television n
49、etworks using cable modems. ITU-T J.164 Recommendation ITU-T J.164 (2007), Event message requirements for the support of real-time services over cable television networks using cable modems. ITU-T J.165 Recommendation ITU-T J.165 (2007), IPCablecom Internet signalling transport protocol (ISTP). ITU-T J.166 Recommendation ITU-T J.166 (2007), IPCablecom Management Information base (MIB) framework. ITU-T J.167 Rec
