1、 ETSI TS 103 556 V1.1.1 (2018-06) Speech and multimedia Transmission Quality (STQ); DTMF transmission over VoIP using RTP Telephony Events TECHNICAL SPECIFICATION ETSI ETSI TS 103 556 V1.1.1 (2018-06)2 Reference DTS/STQ-262 Keywords DTMF, VoIP ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Ced
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7、tion extend to reproduction in all media. ETSI 2018. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are trademarks of ETSI registered for the benefit of its Members. 3GPPTM and LTETMare trademarks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Par
8、tners. oneM2M logo is protected for the benefit of its Members. GSMand the GSM logo are trademarks registered and owned by the GSM Association. ETSI ETSI TS 103 556 V1.1.1 (2018-06)3 Contents Intellectual Property Rights 4g3Foreword . 4g3Modal verbs terminology 4g31 Scope 5g32 References 5g32.1 Norm
9、ative references . 5g32.2 Informative references 5g33 Definitions and abbreviations . 6g33.1 Definitions 6g33.2 Abbreviations . 6g34 Telephone Events for the transmission of DTMF Signals . 6 g34.1 Introduction 6g34.2 Signal input requirements for DTMF receivers in media gateways and SBC scenarios 7g
10、34.3 Signal output requirements of DTMF signals for sender in media gateways and SBC scenarios 7g34.4 Telephony Event Procedures 7g34.4.1 Introduction. 7g34.4.2 Sending procedures . 7g34.4.3 Receiving procedures 8g3History 9g3ETSI ETSI TS 103 556 V1.1.1 (2018-06)4 Intellectual Property Rights Essent
11、ial patents IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs);
12、 Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (https:/ipr.etsi.org/). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been car
13、ried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Trademarks The present document may include trademarks and/or tradenames whi
14、ch are asserted and/or registered by their owners. ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does not constitute an e
15、ndorsement by ETSI of products, services or organizations associated with those trademarks. Foreword This Technical Specification (TS) has been produced by ETSI Technical Committee Speech and multimedia Transmission Quality (STQ). Modal verbs terminology In the present document “shall“, “shall not“,
16、 “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citati
17、on. ETSI ETSI TS 103 556 V1.1.1 (2018-06)5 1 Scope The present document provides the level of detail that will enable manufacturers of telecommunications equipment incorporating Telephony Events described in IETF RFC 4733 1 for the transport of DTMF signalling to design the equipment. The present do
18、cument specifies the signal receiver and transmitter requirements of DTMF signals. 2 References 2.1 Normative references References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies
19、. For non-specific references, the latest version of the referenced document (including any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at https:/docbox.etsi.org/Reference/. NOTE: While any hyperlinks included in this
20、 clause were valid at the time of publication, ETSI cannot guarantee their long term validity. The following referenced documents are necessary for the application of the present document. 1 IETF RFC 4733: “RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals“. 2 ETSI ES 201 235-1: “S
21、pecification of Dual Tone Multi-Frequency (DTMF) Transmitters and Receivers; Part 1: General“. NOTE: Available at http:/www.etsi.org/deliver/etsi_es/201200_201299/20123501/01.01.01_60/es_20123501v010101p.pdf. 3 ETSI ES 201 235-2: “Access and Terminals (AT); Specification of Dual-Tone Multi-Frequency
22、 (DTMF) Transmitters and Receivers; Part 2: Transmitters“. NOTE: Available at http:/www.etsi.org/deliver/etsi_es/201200_201299/20123502/01.02.01_60/es_20123502v010201p.pdf. 4 ETSI ES 201 235-3: “Access and Terminals (AT); Specification of Dual-Tone Multi-Frequency (DTMF) Transmitters and Receivers;
23、Part 3: Receivers“. NOTE: Available at http:/www.etsi.org/deliver/etsi_es/201200_201299/20123503/01.03.01_60/es_20123503v010301p.pdf. 2.2 Informative references References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific re
24、ferences, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee their long term validity. The follo
25、wing referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. i.1 Recommendation ITU-T G.729: “Coding of speech at 8 kbit/s using conjugate-structure algebraic-code-excited linear prediction (CS-ACELP)“. i.2
26、 Recommendation ITU-T G.711: “Pulse code modulation (PCM) of voice frequencies“. ETSI ETSI TS 103 556 V1.1.1 (2018-06)6 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions apply: telephony events: transmission method to carry Dual-Tone
27、Multi Frequency (DTMF) signalling and other tone signals in RTP packets described in IETF RFC 4733 1 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: DTMF Dual-Tone Multi Frequency MGW Media GateWay PSTN Public Switched Telephone Network RTP Real-time Tr
28、ansport Protocol SBC Session Border Controller SDP Session Description Protocol 4 Telephone Events for the transmission of DTMF Signals 4.1 Introduction The telephone events are suitable for transmission of DTMF Signals between media gateways and for end-to-end scenarios. In the gateway scenario, an
29、 Internet telephony media gateway connecting to a packet voice network, the PSTN recreates the DTMF tones or other telephony events and injects them into the PSTN. The RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals are defined in IETF RFC 4733 1. The present document specifies t
30、he signal receiver and transmitter requirements of DTMF signals. The Signal condition requirements are based on the ETSI ES 201 235-1 2, ETSI ES 201 235-2 3 and ETSI ES 201 235-3 4. Figure 1: Reference configuration scenario between two MGW ETSI ETSI TS 103 556 V1.1.1 (2018-06)7 Figure 2: Reference
31、configuration scenario between MGW and VoIP Phone (Fixed wired or mobile) Figure 3: Reference configuration scenario between two SBC (Fixed wired or mobile) 4.2 Signal input requirements for DTMF receivers in media gateways and SBC scenarios The receiver shall comply with ETSI ES 201 235-3 4. 4.3 Si
32、gnal output requirements of DTMF signals for sender in media gateways and SBC scenarios The transmitter shall comply with ETSI ES 201 235-2 3. 4.4 Telephony Event Procedures 4.4.1 Introduction This clause defines the procedures associated with the tone telephony event procedures described in IETF RF
33、C 4733 1. In the gateway scenario, a telephony media gateway connecting to a packet voice network creates telephony events. In the end system scenario, the DTMF events are consumed by the receiving entity itself. 4.4.2 Sending procedures The telephone-event payload shall not be inherently redundant
34、with the RTP packets (DTMF in audio), as described in section 4.4.1 of IETF RFC 4733 1. The maximal DTMF audio Signal leakage shall be lower than 5 ms. If in the media gateway scenario RTP events are not offered in SDP, DTMF shall be transmitted in Audio transparently to the receiving media gateway.
35、 ETSI ETSI TS 103 556 V1.1.1 (2018-06)8 4.4.3 Receiving procedures Receiving implementations play out the tones as received, typically with a playout delay to allow for lost packets. In the case when telephony events and RTP packets received are inherently redundant, only DTMF from the telephony events should be played out. The maximal DTMF Signal leakage shall be lower than 15 ms. Figure 4: Reference configuration scenario between two MGW with signal samples ETSI ETSI TS 103 556 V1.1.1 (2018-06)9 History Document history V1.1.1 June 2018 Publication
