ETSI TS V ( )

Transcription

1 TS V ( ) TECHNICAL SPECIFICATION Universal Mobile Telecommunications System (UMTS); LTE; IP Multimedia Subsystem (IMS); Multimedia telephony; Media handling and interaction (3GPP TS version Release 14)

2 1 TS V ( ) Reference RTS/TSGS ve50 Keywords LTE,UMTS 650 Route des Lucioles F Sophia Antipolis Cedex - FRANCE Tel.: Fax: Siret N NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N 7803/88 Important notice The present document can be downloaded from: The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the present document shall not be modified without the prior written authorization of. In case of any existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the print of the Portable Document Format (PDF) version kept on a specific network drive within Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other documents is available at If you find errors in the present document, please send your comment to one of the following services: Copyright Notification No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm except as authorized by written permission of. The content of the PDF version shall not be modified without the written authorization of. The copyright and the foregoing restriction extend to reproduction in all media All rights reserved. DECT TM, PLUGTESTS TM, UMTS TM and the logo are trademarks of registered for the benefit of its Members. 3GPP TM and LTE are trademarks of registered for the benefit of its Members and of the 3GPP Organizational Partners. onem2m logo is protected for the benefit of its Members. GSM and the GSM logo are trademarks registered and owned by the GSM Association.

3 2 TS V ( ) Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to. The information pertaining to these essential IPRs, if any, is publicly available for members and non-members, and can be found in SR : "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to in respect of standards", which is available from the Secretariat. Latest updates are available on the Web server ( Pursuant to the IPR Policy, no investigation, including IPR searches, has been carried out by. No guarantee can be given as to the existence of other IPRs not referenced in SR (or the updates on the Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by 3rd Generation Partnership Project (3GPP). The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or GSM identities. These should be interpreted as being references to the corresponding deliverables. The cross reference between GSM, UMTS, 3GPP and identities can be found under Modal verbs terminology In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and "cannot" are to be interpreted as described in clause 3.2 of the Drafting Rules (Verbal forms for the expression of provisions). "must" and "must not" are NOT allowed in deliverables except when used in direct citation.

4 3 TS V ( ) Contents Intellectual Property Rights... 2 Foreword... 2 Modal verbs terminology... 2 Foreword Introduction Scope References Definitions and abbreviations Definitions Abbreviations System description System Client MRFP and MGW Media codecs Media components Codecs for MTSI clients in terminals Speech General codec requirements Detailed codec requirements, AMR Detailed codec requirements, AMR-WB Detailed codec requirements, EVS Offering multiple audio bandwidths and multiple channels Codec preference order Video Real-time text Media configuration General Session setup procedures General a RTP profile negotiation a.1 General a.2 Using SDPCapNeg in SDP offer a.3 Answering to an SDP offer using SDPCapNeg Speech General Generating SDP offers Generating SDP answer Video Introduction Common Session Setup Procedures Coordination of Video Orientation (CVO) Video Region-of-Interest (ROI) RTP Retransmission Forward Error Correction (FEC) Text Bandwidth negotiation General Speech Video The Synchronization Info attribute "3gpp_sync_info" Negotiated QoS parameters... 58

5 4 TS V ( ) General Alignment of negotiated QoS parameters and b=as bandwidth modifier Alignment of negotiated QoS parameters and a=bw-info attribute Session control procedures Data transport General RTP profiles RTCP usage General Speech Video Real-time text Void Reduced-Size RTCP Video Region-of-Interest (ROI) Signaling RTP payload formats for MTSI clients General Speech Video Real-time text Coordination of Video Orientation RTP Retransmission Forward Error Correction (FEC) Media flow General Media specific Speech General Default operation General Codec Mode Requests Frame aggregation and redundancy HSPA EGPRS GIP Initial codec mode for AMR and AMR-WB E-UTRAN Initial codec mode for EVS Dual-mono Video Text Media synchronization General Text ECN usage in RTP sessions Handling of bit-rate variations General Video Speech Jitter buffer management in MTSI clients in terminals General Speech Terminology Functional requirements for jitter-buffer management Minimum performance requirements for jitter-buffer management General Objective performance requirements General Jitter buffer delay criteria Jitter induced concealment operations... 80

6 5 TS V ( ) Delay and error profiles Speech material for JBM minimum performance evaluation Video Text Packet-loss handling General Speech General Transmitting redundant frames Receiving redundant frames Video General Receiver behaviour Sender behaviour Recommendations for packet loss recovery mechanisms usage Text Adaptation General Speech General RTCP-APP with codec control requests General General Format of RTCP-APP packet with codec control requests a Padding Redundancy Request Frame Aggregation Request Codec Mode Request Generation of RTP payloads for multiple codec control requests EVS Primary Rate Request EVS Bandwidth Request EVS Channel Aware Request EVS Primary mode to EVS AMR-WB IO mode Switching Request EVS AMR-WB IO mode to EVS Primary mode Switching Request Example use cases SDP negotiation for RTCP-APP Video General Signaling mechanisms Adaptation triggers Sender behavior, downswitching Downswitching divided into phases Rate reduction phase Delay recovery phase Sender behavior, up-switching Receiver behavior, down-switching Receiver behavior, up-switch ECN triggered adaptation Text Explicit Congestion Notification Using the a=bw-info attribute for adaptation Access network bitrate recommendation General Relation to session signaling bitrate information Use with dynamic bitrate adaptation General Adaptation of sent media Adaptation of received media Message mapping for LTE access Front-end handling General

7 6 TS V ( ) 12 Inter-working General G-324M General Codec usage General Text Payload format MTSI media gateway trans-packetization General Speech de-jitter buffer Video bitrate equalization Data loss detection Data integrity indication Packet size considerations General The Maximum Receive SDU Size attribute 3gpp_MaxRecvSDUSize Setting RTP timestamps Protocol termination Media synchronization Session control GERAN/UTRAN CS inter-working G-324M Codecs for MTSI media gateways Speech interworking between 3GPP PS access and CS GERAN/UTRAN a Speech inter-working between fixed access and CS GERAN/UTRAN Text RTP payload formats for MTSI media gateways Speech Text Explicit Congestion Notification Codec switching procedures with SRVCC PSTN G-324M Text GIP inter-working Text Speech Void Void Void Inter-working with other IMS and non-ims IP networks General Speech General Speech codecs and formats MTSI MGW for interworking between MTSI client in terminal using 3GPP access and other IMS or non-ims IP networks MTSI MGW for interworking between MTSI client in terminal using fixed access and other IMS or non-ims IP networks Common procedures Codec preference order for session negotiation RTP profiles RTP payload formats Packetization RTCP usage and adaptation RTP usage Session setup and session modification Audio level alignment Explicit Congestion Notification Text Inter-working IPv4 and IPv6 networks

8 7 TS V ( ) 13 Void a Media types, codecs and formats used for MSRP transport a.1 General a.2 Difference relative to 3GPP TS a.2.1 Video Supplementary services General Media formats and transport Media handling in hold procedures Network preference management object General Nodes Definition Example Configuration of 3GPP MTSINP MO Quality of Experience General Metrics Definition Corruption duration metric Successive loss of RTP packets Frame rate Jitter duration Sync loss duration Round-trip time Average codec bitrate Codec information Metric Configuration QoE metrics reporting management object QoE metric reporting configuration QoE reporting rule definition Metrics Reporting XML schema for QoE report message Example XML for QoE report message Management of Media Adaptation General Media adaptation management object Management procedures Management of speech adaptation Management of video adaptation MTSI client in terminal using fixed access General Media codecs General Speech Speech codecs Error concealment procedures Source controlled rate operation Video Real-time text Media configuration General Session setup procedures General Speech Video Text Bandwidth negotiation Session control procedures Data transport General

9 8 TS V ( ) Packetization RTP payload format Jitter buffer management Packet-loss handling Adaptation Front-end handling Supplementary services Additional bandwidth information General Bandwidth properties General description Maximum Supported Bandwidth Maximum Desired Bandwidth Minimum Desired Bandwidth Minimum Supported Bandwidth IP version Maximum Packet Rate Minimum Packet Rate SDP attribute Definition SDP grammar Declarative use Usage in offer/answer Modifications of the bandwidth information by intermediate network nodes Annex A (informative): Examples of SDP offers and answers A.1 SDP offers for speech sessions initiated by MTSI client in terminal A.1.1 HSPA or unknown access technology A Only AMR-NB supported by MTSI client in terminal A AMR and AMR-WB are supported by MTSI client in terminal A One-phase approach A Two-phase approach A.1.2 EGPRS A.1.3 Generic Access A.2 SDP offers for speech sessions initiated by media gateway A.2.1 General A.2.2 MGW between GERAN UE and MTSI A.2.3 MGW between legacy UTRAN UE and MTSI A.2.4 MGW between CS UE and MTSI A.2.5 MGW between GERAN UE and MTSI when wideband speech is supported A.3 SDP answers to SDP speech session offers A.3.1 General A.3.1a SDP answer from an MTSI client in terminal when only narrowband speech was offered A.3.2 SDP answer from an MTSI client in terminal A.3.2a SDP answer from a non-mtsi UE with AVP A.3.3 SDP answer from an MTSI client in terminal supporting only AMR A.3.4 SDP answer from an MTSI client in terminal using EGPRS access when both AMR and AMR-WB are supported A.3.4a SDP answer from an MTSI client in terminal using EGPRS access when only AMR is supported A.3.4b SDP answer from an MTSI client in terminal using WLAN A.3.5 SDP answer from MTSI MGW supporting only one codec mode set for AMR and AMR-WB each A.3.5a SDP answer from MTSI MGW supporting only one codec mode set for AMR A.3.6 SDP answer from MTSI client in terminal on HSPA for session initiated from MTSI MGW interfacing UE on GERAN A.3.7 SDP answer from MTSI client in terminal on HSPA for session initiated from MTSI MGW interfacing legacy UE on UTRAN A.4 SDP offers and answers for video sessions A.4.1 Void A.4.2 Void

10 9 TS V ( ) A.4.2a A.4.2b A.4.2c A.4.2d A.4.2e A.4.3 A.4.4 A.4.4a A.4.4a.1 A.4.4a.2 A.4.4b A.4.5 A.4.6 A.4.7 A A A A A.4.8 H.264/AVC High Granularity CVO example RTP Retransmission RTP Forward Error Correction (FEC) SDP Examples with ROI Void Void H.264/AVC with "imageattr" attribute H.264/AVC with "imageattr" attribute different image sizes in SDP offer and answer H.264/AVC with "imageattr" attribute different payload type numbers in offer and answer H.264/AVC with "imageattr" attribute with multiple rtpmaps H.264 with asymmetric video streams H.264/AVC with "imageattr" attribute for non-cvo operation H.264 (AVC) and H.265 (HEVC) MTSI client with 848x480 resolution 5 inch display MTSI client with 1280x720 resolution 5 inch display MTSI client with 848x480 resolution 10 inch display MTSI client with 1280x720 resolution 10 inch display H.264 (AVC) and H.265 (HEVC) with asymmetric video streams A.5 SDP offers for text A.5.1 T.140 with and without redundancy A.6 SDP example with bandwidth information A.6.1 General A.6.2 SDP examples with bandwidth information declared with bandwidth modifiers A.6.3 SDP examples giving additional bandwidth information using the a=bw-info attribute A.7 SDP examples with "3gpp_sync_info" attribute A.7.1 Synchronized streams A.7.2 Nonsynchronized streams A.8 SDP example with QoS negotiation A.9 Void A.9a SDP offer/answer regarding the use of Reduced-Size RTCP A.10 Examples of SDP offers and answers for inter-working with other IMS or non-ims IP networks A.10.1 General A.10.2 Session initiated by MTSI client in terminal A SDP offers from an MTSI client in terminal A SDP offers modified by MTSI MGW when pre-emptively adding inter-working formats A SDP modified by MGW when adding inter-working formats only when the original SDP offer was rejected A.11 Adding or removing a video component to/from an on-going video call session A.12 SDP examples when using ECN A.12.1 SDP examples when using ECN for speech A With RTP/AVP and zero RTCP bandwidth A With RTP/AVPF and non-zero RTCP bandwidth A With RTCP ECN feedback messages and RTCP XR ECN summary reports for inter-working with non-mtsi clients A.12.2 SDP examples when using ECN for video in RTP A Without RTCP AVPF ECN feedback messages and RTCP XR ECN summary reports A With RTCP AVPF ECN feedback messages and RTCP XR ECN summary reports for inter-working with non-mtsi clients A.13 SDP examples for MTSI client in terminal using fixed access A.13.1 General A.13.2 SDP examples for PCM A.13.3 SDP example for G A.13.4 SDP example for EVS, AMR-WB, G.722, AMR, PCM and DTMF A.14 SDP offers and answers for speech sessions with EVS

11 10 TS V ( ) A.14.1 A A A A A.14.2 A A.14.3 A A A A A A A A A.14.4 A A A SDP offers initiated by MTSI client in terminal Unknown access technology EGPRS E-UTRAN/HSPA Dual-mono SDP offers initiated by media gateway Network between MTSI using fixed access and MTSI modifying SDP offer to configure EVS AMR- WB IO mode SDP answers from MTSI client in terminal SDP answer from MTSI client in terminal when narrowband speech is negotiated SDP answer from MTSI client in terminal when up to wideband speech is negotiated SDP answer from MTSI client in terminal when only wideband speech is negotiated SDP answer from MTSI client in terminal when up to super-wideband speech is negotiated SDP answer from MTSI client in terminal when only super-wideband speech is negotiated SDP answer from MTSI client in terminal using WLAN SDP answer from MTSI client in terminal supporting dual-mono SDP answer from MTSI client in terminal when SC-VBR is negotiated SDP answers from MTSI client in terminal using fixed access SDP answer from MTSI client in terminal using fixed access when narrowband speech is negotiated SDP answer from MTSI client in terminal using fixed access when only wideband speech is negotiated SDP answer from MTSI client in terminal using fixed access when only super-wideband speech is negotiated Annex B (informative): Examples of adaptation scenarios B.1 Video bitrate adaptation Annex C (informative): Example adaptation mechanisms for speech C.1 Example of feedback and adaptation for speech and video C.1.1 Introduction C.1.2 Signalling state considerations C.1.3 Adaptation state machine implementations C General C Adaptation state machine with four states C Adaptation state machine with four states (simplified version without frame aggregation) C Adaptation state machine with two states C Adaptation when using ECN C.2 Example criteria for video bit rate feedback and adaptation C.2.1 Introduction C.2.2 Media sender side C.2.3 Media receiver side C.2.4 Video encoder bitrate adaptation, down-switch C.2.5 Video encoder bitrate adaptation, receiver-driven up-switch C.2.6 Video encoder bitrate adaptation, recovery phase Annex D (informative): Annex E (informative): Reference delay computation algorithm QoS profiles E.1 General E.2 Bi-directional speech (AMR12.2, IPv4, RTCP and MBR=GBR bearer) E.3 Void E.4 Bi-directional real-time text (3 kbps, IPv4 or IPv6, RTCP and MBR=GBR bearer) E.5 Bi-directional speech (AMR-WB23.85, IPv4, RTCP and MBR=GBR bearer) E.6 Bi-directional video (H.264 AVC level 1.1, 192 kbps, IPv4, RTCP and MBR=GBR bearer) E.7 Bi-directional speech (AMR12.2, IPv6, RTCP and MBR=GBR bearer)

12 11 TS V ( ) E.8 Bi-directional speech (AMR-WB23.85, IPv6, RTCP and MBR=GBR bearer) E.9 Void E.10 Bi-directional video (H.264 AVC level 1.1, 192 kbps, IPv6, RTCP and MBR=GBR bearer) E.11 Bi-directional speech (AMR, IPv4, RTCP and MBR>GBR bearer) E.12 Bi-directional speech (AMR-WB, IPv4, RTCP and MBR>GBR bearer) E.13 Void E.14 Bi-directional video (H.264 AVC level 1.1, IPv4, RTCP and MBR>GBR bearer) E.15 Bi-directional speech (AMR, IPv6, RTCP and MBR>GBR bearer) E.16 Bi-directional speech (AMR-WB, IPv6, RTCP and MBR>GBR bearer) E.17 Void E.18 Bi-directional video (H.264 AVC level 1.1, IPv6, RTCP and MBR>GBR bearer) E.19 Bi-directional video (H.264 AVC level 1.2, 384 kbps, IPv4, RTCP and MBR=GBR bearer) E.20 Bi-directional video (H.264 AVC level 1.2, 384 kbps, IPv6, RTCP and MBR=GBR bearer) E.21 Bi-directional video (H.264 AVC level 1.2, IPv4, RTCP and MBR>GBR bearer) E.22 Bi-directional video (H.264 AVC level 1.2, IPv6, RTCP and MBR>GBR bearer) E.23 Bi-directional video (H.265 (HEVC) Main profile, Main tier, level 3.1, 500 kbps, IPv6, RTCP and MBR=GBR bearer) E.24 Bi-directional video (H.265 (HEVC) Main profile, Main tier, level 3.1, 500/40 kbps, IPv6, RTCP and MBR>GBR bearer) E.25 Bi-directional video (H.265 (HEVC) Main profile, Main tier, level 3.1, 600 kbps, IPv6, RTCP and MBR=GBR bearer) E.26 Bi-directional video (H.265 (HEVC) Main profile, Main tier, level 3.1, 600/40 kbps, IPv6, RTCP and MBR>GBR bearer) E.27 Bi-directional video (H.265 (HEVC) Main profile, Main tier, level 3.1, 650 kbps, IPv6, RTCP and MBR=GBR bearer) E.28 Bi-directional video (H.265 (HEVC) Main profile, Main tier, level 3.1, 650/40 kbps, IPv6, RTCP and MBR>GBR bearer) E.29 Bi-directional video (H.265 (HEVC) Main profile, Main tier, level 3.1, 750 kbps, IPv6, RTCP and MBR=GBR bearer) E.30 Bi-directional video (H.265 (HEVC) Main profile, Main tier, level 3.1, 750/40 kbps, IPv6, RTCP and MBR>GBR bearer) E.31 Bi-directional speech (EVS 13.2, IPv4, RTCP and MBR=GBR bearer) E.32 Bi-directional speech (EVS 24.4, IPv4, RTCP and MBR=GBR bearer) E.33 Bi-directional speech (EVS 13.2, IPv6, RTCP and MBR=GBR bearer) E.34 Bi-directional speech (EVS 24.4, IPv6, RTCP and MBR=GBR bearer) Annex F (Normative): Annex G (Normative): Void DTMF events G.1 General G.2 Encoding of DTMF signals G.3 Session setup

13 12 TS V ( ) G.4 Data transport Annex H (informative): Annex I (informative): Annex J (informative): Annex K (informative): Network Preference Management Object Device Description Framework QoE Reporting Management Object Device Description Framework Media Adaptation Management Object Device Description Framework Computation of b=as for AMR and AMR-WB K.1 General K.2 Procedure for computing the bandwidth K.3 Computation of RTP payload size K.4 Detailed computation Annex L (Normative): Facsimile transmission L.1 General L.2 FoIP support in MTSI clients L.2.1 FoIP support in MTSI client in terminal L.2.2 FoIP support in MTSI MGW L.2.3 Recommended configuration L.3 Session setup L.3.1 Session setup for any MTSI client supporting facsimile transmission L.3.2 Session setup when the recommended profile is supported L.4 Data transport using UDP/IP L.5 CS GERAN inter-working L.6 PSTN inter-working L.7 SDP examples L.7.1 Facsimile-only session Annex M (informative): IANA registration information for SDP attributes M.1 Introduction M.2 3gpp_sync_info M.3 3gpp_MaxRecvSDUSize M.4 3gpp_mtsi_app_adapt M.5 predefined_roi M.6 bw-info M.7 ccc_list Annex N (informative): Computation of b=as for Video Codec N.1 General N.2 Examples Annex O (informative): IANA registration information for RTP Header Extensions O.1 Introduction O.2 urn:3gpp:video-orientation O.3 urn:3gpp:video-orientation:

14 13 TS V ( ) O.4 urn:3gpp:roi-sent O.5 urn:3gpp:predefined-roi-sent Annex P (informative): Video packet loss handling operation principles and examples P.1 General P.2 Video error recovery P.3 RTP Retransmission Annex Q (informative): Computation of b=as for EVS Q.1 General Q.2 Procedure for computing the bandwidth Q.3 Computation of RTP payload size Q.4 Detailed computation Annex R (informative): IANA registration information for RTCP Feedback Message Types R.1 Video Region-of-Interest (ROI) Annex S (normative): Multi-party Multimedia Conference Media Handling S.1 General S.2 Video S.2.1 Conversational video S.2.2 Non-conversational (screenshare) video S.3 Audio S.3.1 General S.3.2 De-jitter buffer S.4 SIP S.4.1 MSMTSI client in terminal S.4.2 MSMTSI MRF S.5 Media configuration S.5.1 General S.5.2 Main video S.5.3 Thumbnail video S.5.4 Screenshare video S.5.5 Audio S.5.6 BFCP S.5.7 Compact Concurrent Codec Negotiation and Capabilities S General S The Compact CCC SDP Attribute S Using the Compact CCC SDP Attribute for CCC Exchange S Using the Compact CCC SDP Attribute for Session Initiation S General S SDP Offer Rules S SDP Answer Rules S.6 Media transport S.6.1 RTP S.6.2 RTCP S.6.3 RTP Stream Selective Forwarding S.7 BFCP S.7.1 General S.7.2 Floor controlled main video S.7.3 Floor controlled screenshare video S.7.4 Implicit floor control for audio

15 14 TS V ( ) S.7.5 Floor control interworking with DTMF-capable MTSI clients S.8 Rate Adaptation Annex T (informative): SDP examples for Multi-party Multimedia Conference Media Handling T.1 General T.1.1 Introduction T.1.2 Quality of Service examples T.2 MSMTSI video offer/answer examples T.2.1 MSMTSI offer/answer towards an MTSI client T.2.2 MSMTSI answer from an MSMTSI MRF T.2.3 MSMTSI answer from an MSMTSI client in terminal T.2.4 MSMTSI simulcast offer using a single payload type T.2.5 MSMTSI simulcast offer using two codecs T.3 MSMTSI audio offer/answer examples T.3.1 MSMTSI offer with multi-stream audio support T.3.2 MSMTSI answer with multi-stream audio support T.3.3 MSMTSI CCCEx SDP offer/answer example T.3.3a MSMTSI offer/answer examples using the compact CCC SDP attribute T.3.4 SIP OPTIONS request for multi-stream audio support Annex U (informative): IANA registration information for media types U.1 Introduction U.2 application/ccce Annex V (informative): Change history History

16 15 TS V ( ) Foreword This Technical Specification has been produced by the 3 rd Generation Partnership Project (3GPP). The contents of the present document are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an identifying change of release date and an increase in version number as follows: Version x.y.z where: x the first digit: 1 presented to TSG for information; 2 presented to TSG for approval; 3 or greater indicates TSG approved document under change control. y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. Introduction Multimedia Telephony Service for IMS (MTSI), here also referred to as Multimedia Telephony, is a standardized IMS telephony service that builds on the IMS capabilities to establish multimedia communications between terminals within and in-between operator networks. The terminals connect to the IMS using either a fixed access network or a 3GPP access network. The objective of defining a service is to specify the minimum set of capabilities required in the IP Multimedia Subsystem to secure multi-vendor and multi-operator inter-operability for Multimedia Telephony and related Supplementary Services. The objective also includes defining procedures for inter-working between different clients and networks. The user experience of multimedia telephony is expected to be equivalent to or better than corresponding circuitswitched telephony services. Multimedia telephony also exploits the richer capabilities of IMS. In particular, multiple media components can be used and dynamically added or dropped during a session.

17 16 TS V ( ) 1 Scope The present document specifies a client for the Multimedia Telephony Service for IMS (MTSI) supporting conversational speech (including DTMF), video and text transported over RTP with the scope to deliver a user experience equivalent to or better than that of Circuit Switched (CS) conversational services using the same amount of network resources. It defines media handling (e.g. signalling, transport, jitter buffer management, packet-loss handling, adaptation), as well as interactivity (e.g. adding or dropping media during a call). The focus is to ensure a reliable and interoperable service with a predictable media quality, while allowing for flexibility in the service offerings. The present document describes two client types: - An MTSI client in terminal which uses a 3GPP access (LTE, HSPA, or EGPRS) to connect to the IMS. These clients are described in Clauses 5 17 and Annexes A M. - An MTSI client in terminal which uses a fixed access (corded interface, fixed-wireless interface, e.g. Wi-Fi, Bluetooth or DECT/NG DECT) to connect to the IMS. These clients are described in Clause 18. MTSI clients using 3GPP access and MTSI clients using fixed access have many common procedures for the media handling. This specification aligns the media handling by using cross references whenever possible. This does not mean that 3GPP terminals must support fixed access, nor does it mean that fixed terminals must support 3GPP access. The scope includes maintaining backward compatibility in order to ensure seamless inter-working with existing services available in the CS domain, such as CS speech and video telephony, as well as with terminals of earlier 3GPP releases. In addition, inter-working with other IMS and non-ims IP networks as well as traditional PSTN is covered. The client may also support the IMS Messaging service and Group 3 facsimile transmission. The scope therefore also includes media handling for non-conversational media using MSRP and UDPTL-based Facsimile over IP (FoIP). The specification is written in a forward-compatible way in order to allow additions of media components and functionality in releases after Release 7. NOTE 1: MTSI clients can support more than conversational speech, video and text, which is the scope of the present document. See 3GPP TS [2] for the definition of the Multimedia Telephony Service for IMS. NOTE 2: 3GPP TS [3] and 3GPP TS [4] do not include the specification of an MTSI client, although they include conversational multimedia applications. Only those parts of 3GPP TS [3] and 3GPP TS [4] that are specifically referenced by the present document apply to Multimedia Telephony Service for IMS. NOTE 3: The present document was started as a conclusion from the study in 3GPP TR [5] on optimization opportunities in Multimedia Telephony for IMS (3GPP TR [6]). NOTE 4: For ECN, the present specification assumes that an interface enables the MTSI client to read and write the ECN field. This interface is outside the scope of this specification. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. - References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific. - For a specific reference, subsequent revisions do not apply. - For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document. [1] 3GPP TR : "Vocabulary for 3GPP Specifications".

18 17 TS V ( ) [2] 3GPP TS : "IP Multimedia Core Network Subsystem (IMS) Multimedia Telephony Service and supplementary services; Stage 1". [3] 3GPP TS : "Packet switched conversational multimedia applications; Default codecs". [4] 3GPP TS : "Packet switched conversational multimedia applications; Transport protocols". [5] 3GPP TR : "Multimedia telephony over IP Multimedia Subsystem (IMS); Optimization opportunities". [6] 3GPP TR : "IMS Multimedia Telephony service; and supplementary services". [7] 3GPP TS : "IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3". [8] IETF RFC 4566 (2006): "SDP: Session Description Protocol", M. Handley, V. Jacobson and C. Perkins. [9] IETF RFC 3550 (2003): "RTP: A Transport Protocol for Real-Time Applications", H. Schulzrinne, S. Casner, R. Frederick and V. Jacobson. [10] IETF RFC 3551 (2003): "RTP Profile for Audio and Video Conferences with Minimal Control", H. Schulzrinne and S. Casner. [11] 3GPP TS : "Mandatory Speech Codec speech processing functions; AMR Speech CODEC; General description". [12] 3GPP TS : "Mandatory Speech Codec speech processing functions; Adaptive Multi-Rate (AMR) speech codec; Transcoding functions". [13] 3GPP TS : "ANSI C code for the Adaptive Multi Rate (AMR) speech codec". [14] 3GPP TS : "ANSI-C code for the floating-point Adaptive Multi Rate (AMR) speech codec". [15] 3GPP TS : "Mandatory speech codec speech processing functions; Adaptive Multi-Rate (AMR) speech codec; Source controlled rate operation". [16] 3GPP TS : "Speech codec list for GSM and UMTS". [17] 3GPP TS : "Speech codec speech processing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; General description". [18] 3GPP TS : "Speech codec speech processing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; Transcoding functions". [19] 3GPP TS : "ANCI-C code for the Adaptive Multi Rate - Wideband (AMR-WB) speech codec". [20] 3GPP TS : "Speech codec speech processing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; ANSI-C code". [21] 3GPP TS : "Speech codec speech processing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; Source controlled rate operation". [22] ITU-T Recommendation H.263 (01/2005): "Video coding for low bit rate communication". [23] ISO/IEC :2004: "Information technology - Coding of audio-visual objects - Part 2: Visual". [24] ITU-T Recommendation H.264 (04/2013): "Advanced video coding for generic audiovisual services". [25] IETF RFC 6184 (2011): "RTP Payload Format for H.264 Video", Y.-K. Wang, R. Even, T. Kristensen, R. Jesup. [26] ITU-T Recommendation T.140 (02/1998): "Protocol for multimedia application text conversation".

19 18 TS V ( ) [27] ITU-T Recommendation T.140 (02/2000): "Protocol for multimedia application text conversation - Addendum 1". [28] IETF RFC 4867 (2007): "RTP Payload Format and File Storage Format for the Adaptive Multi- Rate (AMR) and Adaptive Multi-Rate Wideband (AMR-WB) Audio Codecs", J. Sjoberg, M. Westerlund, A. Lakaniemi and Q. Xie. [29] IETF RFC 4629 (2007): "RTP Payload Format for ITU-T Rec. H.263 Video", J. Ott, C. Bormann, G. Sullivan, S. Wenger and R. Even. [30] Void. [31] IETF RFC 4103 (2005): "RTP Payload for Text Conversation", G. Hellstrom and P. Jones. [32] IETF RFC 3555 (2003): "MIME Type Registration of RTP Payload Formats", S. Casner and P. Hoschka. [33] 3GPP TR : "Typical examples of Radio Access Bearers (RABs) and Radio Bearers (RBs) supported by Universal Terrestrial Radio Access (UTRA)". [34] 3GPP TS : "Services and service capabilities". [35] 3GPP TS : "Terminal acoustic characteristics for telephony; Requirements". [36] 3GPP TS : "Speech and video telephony terminal acoustic test specification". [37] 3GPP TS : "Inband Tandem Free Operation (TFO) of speech codecs; Service description; Stage 3". [38] 3GPP TS : "Out of band transcoder control; Stage 2". [39] IETF RFC 0768 (1980): "User Datagram Protocol", J. Postel. [40] IETF RFC 4585 (2006): "Extended RTP Profile for Real-time Transport Control Protocol (RTCP) - Based Feedback (RTP/AVPF)", J. Ott, S. Wenger, N. Sato, C. Burmeister and J. Rey. [41] RTP Tools: [42] IETF RFC 3556 (2003): "Session Description Protocol (SDP) Bandwidth Modifiers for RTP Control Protocol (RTCP) Bandwidth", S. Casner. [43] IETF RFC 5104 (2008): "Codec Control Messages in the RTP Audio-Visual Profile with Feedback (AVPF)", S. Wenger, U. Chandra, M. Westerlund and B. Burman. [44] Void. [45] 3GPP TS : "Codec for circuit switched multimedia telephony service; Modifications to H.324". [46] 3GPP TS : "Technical realization of Circuit Switched (CS) multimedia service; UDI/RDI fallback and service modification; Stage 2". [47] 3GPP TS : "Network Architecture". [48] IETF RFC 3388 (2002): "Grouping of Media Lines in the Session Description Protocol (SDP)", G. Camarillo, G. Eriksson, J. Holler and H. Schulzrinne. [49] IETF RFC 4102 (2005): "Registration of the text/red MIME Sub-Type", P. Jones. [50] ITU-T H.248 (06/2000): "Packages for text conversation, fax and call discrimination". [51] EG , v1.2.1 ( ): "Human Factors (HF); Duplex Universal Speech and Text (DUST) communications". [52] 3GPP TS : "Cellular text telephone modem; General description".

20 19 TS V ( ) [53] IETF RFC 4504 (2006): "SIP Telephony Device Requirements and Configuration", H. Sinnreich, Ed., S. Lass and C. Stredicke. [54] ITU-T Recommendation V.151 (05/2006): "Procedures for end-to-end connection of analogue PSTN text telephones over an IP network utilizing text relay". [55] ITU-T Recommendation V.152 (09/2010): "Procedures for supporting Voice Band Data over IP networks". [56] IETF RFC 3448 (2003): "TCP Friendly Rate Control (TFRC): Protocol Specification", M. Handley, S. Floyd, J. Padhye and J. Widmer. [57] 3GPP TS : "IMS Multimedia Telephony Communication Service and Supplementary Services". [58] IETF RFC 3264 (2002): "An Offer/Answer Model with the Session Description Protocol (SDP)", J. Rosenberg and H. Schulzrinne. [59] 3GPP TS : "IP Multimedia System (IMS) Messaging and Presence; Media formats and codecs". [60] 3GPP TS : "Transparent end-to-end Packet-switched Streaming Service; Protocols and codecs". [61] IETF RFC 4733 (2006): "RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals", H. Schulzrinne and T.Taylor. [62] 3GPP TS : "Support of Dual Tone Multi-Frequency (DTMF) signalling". [63] ES , v1.2.1: "Specification of Dual Tone Multi-Frequency (DTMF); Transmitters and Receivers; Part 2: Transmitters". [64] 3GPP TS : "Quality of Service (QoS) concept and architecture". [65] 3GPP TS : "Interworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networks". [66] Void. [67] OMA-ERELD-DM-V1_ A: "Enabler Release Definition for OMA Device Management, Approved Version 1.2". [68] Void. [69] IETF RFC 5939 (2010): Session Description Protocol (SDP) Capability Negotiation, F. Andreasen. [70] 3GPP TS : "Network Identity and Time Zone (NITZ), Stage 1". [71] IETF RFC 1952 (May 1996): "GZIP file format specification version 4.3", P. Deutsch. [72] IETF RFC 2326 (1998): "Real Time Streaming Protocol (RTSP)". [73] IETF RFC 2616 (June 1999): "Hypertext Transfer Protocol -- HTTP/1.1". [74] 3GPP TS Multimedia Broadcast/Multicast Service (MBMS); Protocols and codecs. [75] 3GPP TS : "Technical realization of Short Message Service (SMS)". [76] IETF RFC 6236 (2011): Negotiation of Generic Image Attributes in the Session Description Protocol (SDP), I. Johansson and K. Jung. [77] ITU-T G.711 (11/1988): "Pulse code modulation (PCM) of voice frequencies". [78] ITU-T G.722 (09/2012): "7 khz audio-coding within 64 kbit/s". [79] IETF RFC 4821 (2007): "Packetization Layer Path MTU Discovery".

21 20 TS V ( ) [80] 3GPP TS : "Numbering, addressing and identification". [81] IETF RFC 4796 (2007): "The session description protocol (SDP) content attribute", J. Hautakorpi and G. Camarillo. [82] 3GPP TS : "Messaging service using the IP Multimedia (IM) Core Network (CN) subsystem". [83] IETF RFC 3168 (2001): "The Addition of Explicit Congestion Notification (ECN) to IP", K. Ramakrishnan, S. Floyd and D. Black. [84] IETF RFC 6679 (2012): "Explicit Congestion Notification (ECN) for RTP over UDP", M. Westerlund, et. al. [85] 3GPP TS : "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description". [86] 3GPP TS : "General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access". [87] IETF RFC 5506 (2009): "Support for Reduced-Size Real-Time Transport Control Protocol (RTCP): Opportunities and Consequences". [88] IETF RFC 3611 (2003): "RTP Control Protocol Extended Reports (RTCP XR) ", T. Friedman, R. Caceres and A. Clark. [89] 3GPP TS : "UTRAN overall description". [90] 3GPP TS : "Policy and charging control architecture". [91] ITU-T Recommendation T.4 (07/2003): "Standardization of Group 3 facsimile terminals for document transmission". [92] ITU-T Recommendation T.30 (09/2005): "Procedures for document facsimile transmission in the general switched telephone network". [93] ITU-T Recommendation T.38 (09/2010): "Procedures for real-time Group 3 facsimile communication over IP networks". [94] IETF RFC 3362 (2002): "Real-time Facsimile (T.38) - image/t38 MIME Sub-type Registration". [95] IETF RFC 5285 (2008): "A General Mechanism for RTP Header Extensions", D. Singer, H. Desineni. [96] IETF RFC 5168 (2008): "XML Schema for Media Control", O. Levin, R. Even and P. Hagendorf. [97] 3GPP2 C.S0055-A, version 1.0: "Packet Switched Video Telephony Service (PSVT/MCS)". [98] TS , v3.3.1: "Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); Service and Capability Requirements". [99] 3GPP2 C.S0014-E, version 1.0: "Enhanced Variable Rate Codec (EVRC)". [100] ITU-T Recommendation G.729 (06/2012): "Coding of speech at 8 kbit/s using conjugate-structure algebraic-code-excited linear prediction (CS-ACELP)". [101] ITU-T Recommendation G (05/2006): "G.729-based embedded variable bit-rate coder: An 8-32 kbit/s scalable wideband coder bitstream interoperable with G.729". [102] 3GPP2 C.S0076, version 1.0: "Discontinuous Transmission (DTX) of Speech in cdma2000 Systems". [103] IETF RFC 5188 (2008):"RTP Payload Format for the Enhanced Variable Rate Wideband Codec (EVRC-WB) and the Media Subtype Updates for EVRC-B Codec". [104] IETF RFC 4749 (2006): "RTP Payload Format for the G Audio Codec".

22 21 TS V ( ) [105] IETF RFC 5459 (2009): "G RTP Payload Format Update: Discontinuous Transmission (DTX) Support". [106] IETF RFC 4788 (2007): "Enhancements to RTP Payload Formats for EVRC Family Codecs". [107] IETF RFC 4855 (2007): "Media Type Registration of RTP Payload Formats". [108] ITU-T Recommendation P.10 (07/2006): "Vocabulary and effects of transmission parameters on customer opinion of transmission quality". [109] TS , v1.1.2: "Speech and multimedia Transmission Quality (STQ); Transmission requirements for narrowband wireless terminals (handset and headset) from a QoS perspective as perceived by the user". [110] TS , v1.1.2: "Speech and multimedia Transmission Quality (STQ); Transmission requirements for narrowband wireless terminals (handsfree) from a QoS perspective as perceived by the user". [111] TS , v1.1.2: "Speech and multimedia Transmission Quality (STQ); Transmission requirements for wideband wireless terminals (handset and headset) from a QoS perspective as perceived by the user". [112] TS , v1.1.2: "Speech and multimedia Transmission Quality (STQ); Transmission requirements for wideband wireless terminals (handsfree) from a QoS perspective as perceived by the user". [113] TS , v1.3.2: "Speech and multimedia Transmission Quality (STQ); Transmission requirements for narrowband VoIP terminals (handset and headset) from a QoS perspective as perceived by the user". [114] TS , v1.3.2: "Speech and multimedia Transmission Quality (STQ); Transmission requirements for narrowband VoIP loudspeaking and handsfree terminals from a QoS perspective as perceived by the user". [115] TS , v1.3.2: "Speech and multimedia Transmission Quality (STQ); Transmission requirements for wideband VoIP terminals (handset and headset) from a QoS perspective as perceived by the user ". [116] TS , v1.3.2: "Speech and multimedia Transmission Quality (STQ); Transmission requirements for wideband VoIP loudspeaking and handsfree terminals from a QoS perspective as perceived by the user ". [117] EN , v2.5.1: "Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 8: Speech and audio coding and transmission". [118] TS , v2.2.1: "Digital Enhanced Cordless Telecommunications (DECT); Test specification; Part 2: Audio and speech". [119] ITU-T Recommendation H.265 (04/2013): "High efficiency video coding". [120] IETF RFC 7798 (2016): "RTP Payload Format for High Efficiency Video Coding (HEVC)", Y.-K. Wang, Y. Sanchez, T. Schierl, S. Wenger, M. M. Hannuksela. [121] 3GPP TS : "Codec for Enhanced Voice Services (EVS); General Overview". [122] 3GPP TS : "Codec for Enhanced Voice Services (EVS); ANSI C code (fixed-point)". [123] 3GPP TS : "Codec for Enhanced Voice Services (EVS); ANSI C code (floating-point)". [124] 3GPP TS : "Codec for Enhanced Voice Services (EVS); Test Sequences". [125] 3GPP TS : "Codec for Enhanced Voice Services (EVS); Detailed Algorithmic Description". [126] 3GPP TS : "Codec for Enhanced Voice Services (EVS); AMR-WB Backward Compatible Functions".