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ITU-T H.721 (V3) (03/2022)

IPTV terminal devices: Basic model

Recommendation ITU-T H.721 describes and specifies the functionalities of the Internet protocol television (IPTV) terminal devices for the IPTV basic services defined in Recommendation ITU-T H.720. This Recommendation is targeted at IPTV terminal devices capable of receiving linear television (TV) service and video-on-demand services, with additional data content (such as text) using a managed content delivery network. The service definition takes into consideration conditions on content delivery such as quality of service (QoS). The expected types of IPTV terminal devices are set-top boxes and digital TV sets with embedded IPTV capabilities.
The second edition introduced support for high efficiency video coding (HEVC), dynamic adaptive streaming over HTTP (DASH), MPEG-4 audio lossless coding (ALS), MPEG-4 advanced audio coding (AAC), DTS-HD, timed text markup language (TTML), MPEG media transport (MMT) and several corrections and clarifications.
The third edition introduces support for new technologies such as timestamped fragmented time-length-value (TFT).

Citation:	https://handle.itu.int/11.1002/1000/14952
Series title:	H series: Audiovisual and multimedia systems H.700-H.799: IPTV multimedia services and applications for IPTV H.720-H.729: IPTV terminal devices
Approval date:	2022-03-16
Provisional name:	H.IPTV-TDES.2
Approval process:	AAP
Status:	In force
Maintenance responsibility:	ITU-T Study Group 16
Further details:	Patent statement(s) Development history [12 related work items in progress]

Ed.	ITU-T Recommendation	Status	Summary	Table of Contents	Download
3	H.721 (V3) (03/2022)	In force	here	here	here
2	H.721 (04/2015)	Superseded	here	here	here
1.1	H.721 (2009) Amd. 1 (07/2010)	Superseded	here	-	here
1	H.721 (03/2009)	Superseded	here	here	here


ITU-T Supplement	Title	Status	Summary	Table of contents	Download
H Suppl. 6 (04/2006)	Control load quantum for decomposed gateways	In force	here	here	here
H Suppl. 9 (05/2008)	Gateway control protocol: Operation of H.248 with H.225.0, SIP, and ISUP in support of emergency telecommunications service (ETS)/international emergency preference scheme (IEPS)	In force	here	here	here
H Suppl. 11 (02/2009)	Analysis of class-based home network QoS solutions	In force	here	here	here
H Suppl. 12 (11/2013)	Gateway control protocol: Priority traffic treatment by ITU-T H.248 gateways	In force	here	here	here
H Suppl. 13 (10/2015)	Gateway control protocol: Common ITU-T H.248 terminology - Release 2	In force	here	here	here
H Suppl. 14 (10/2015)	Gateway control protocol: SDP codepoints for gateway control - Release 2	In force	here	here	here
H Suppl. 15 (01/2017)	Conversion and coding practices for HDR/WCG Y'CbCr 4:2:0 video with PQ transfer characteristics	In force	here	here	here
H Suppl. 17 (11/2014)	Guide for addressing accessibility in standards	In force	here	here	here
H Suppl. 18 (10/2017)	Signalling, backward compatibility and display adaptation for HDR/WCG video coding	In force	here	here	here
H Suppl. 19 (04/2021)	Usage of video signal type code points	In force	here	here	here

Title	Approved on	Download
Testing of personal audio systems for compliance with ITU-T H.870 (2018)	2021	here
IPTV service deployment scenarios in high-speed broadband era	2017	here
Media coding toolbox for IPTV: Audio and video codecs	2016	here
Media coding toolbox for IPTV: Audio and video codecs	2016	here
IPTV Green Book	2015	here
Conformance testing specification for ITU-T H.721	2015	here
Glossary and terminology of IP-based TV-related multimedia services	2014	here
Delivery and control protocols handled by IPTV terminal devices	2011	here
Telecommunications Accessibility Checklist	2006	here

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ITU-T Recommendations

ITU-T H.721 (V3) (03/2022)