Telchemy has been an active participant in a wide range of standards organizations, including ATIS, ETSI, IETF, ITU, PacketCable, Telemanagement Forum and TIA. Since the company was founded, Telchemy has led the development of many of the protocols and standards related to Voice over IP performance reporting. We continue to actively contribute toward the development of new standards, including technical standards for performance monitoring of IPTV and IP videoconferencing.
Telchemy believes that active involvement in standards development is important, and we ensure that our products and technologies comply with relevant standards. At the same time, we drive our technology development in line with expected market evolution.
Standards for which Telchemy was an Author or Editor
Following are lists of published standards and Internet Drafts that were authored or edited by Telchemy.
Published Standards
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IETF RFC 3611 | RTP Control Protocol Extended Reports (RTCP XR) | Defines the RTP Control Protocol Extended Reports (RTCP XR) protocol, which is used to report VoIP call quality metrics detailing packet loss, discard, delay, signal/noise/echo levels, perceptual quality (R-factor and MOS), and other factors. | Nov 2003 |
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IETF RFC 6035 | Session Initiation Protocol Event Package for Voice Quality Reporting | Defines the SIP RTCP Summary Report protocol, which enables a Reporter (such as an IP phone running reporting agent software) to send reports containing RTCP XR voice quality metrics and SIP call information to a remote Collector. | Nov 2010 |
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IETF RFC 6390 / BCP 170 | Guidelines for Considering New Performance Metric Development | Describes a framework and a process for developing Performance Metrics of protocols and applications transported over IETF-specified protocols. These metrics can be used to characterize traffic on live networks and services. | Oct 2011 |
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IETF RFC 6776 | Measurement Identity and Information Reporting Using a Source Description (SDES) Item and an RTCP Extended Report (XR) Block | Defines an RTP Control Protocol (RTCP) Source Description (SDES) item and an RTCP Extended Report (XR) block carrying parameters that identify and describe a measurement period to which one or more other RTCP XR blocks may refer. | Oct 2012 |
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IETF RFC 6798 | RTP Control Protocol (RTCP) Extended Report (XR) Block for Packet Delay Variation Metric Reporting | Defines an RTP Control Protocol (RTCP) Extended Report (XR) block that allows the reporting of packet delay variation metrics for a range of RTP applications. | Nov 2012 |
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IETF RFC 6843 | RTP Control Protocol (RTCP) Extended Report (XR) Block for Delay Metric Reporting | Defines an RTP Control Protocol (RTCP) Extended Report (XR) block that allows the reporting of delay metrics for use in a range of Real-time Transport Protocol (RTP) applications. | Jan 2013 |
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IETF RFC 6958 | RTP Control Protocol (RTCP) Extended Report (XR) Block for Burst/Gap Loss Metric Reporting | Defines an RTP Control Protocol (RTCP) Extended Report (XR) Block that allows the reporting of burst and gap loss metrics for use in a range of RTP applications. | May 2013 |
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IETF RFC 7002 | RTP Control Protocol (RTCP) Extended Report (XR) Block for Discard Count Metric Reporting | Defines an RTP Control Protocol (RTCP) Extended Report (XR) block that allows the reporting of a simple discard count metric for use in a range of RTP applications. | Sep 2013 |
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IETF RFC 7003 | RTP Control Protocol (RTCP) Extended Report (XR) Block for Burst/Gap Discard Metric Reporting | Defines an RTP Control Protocol (RTCP) Extended Report (XR) block that allows the reporting of burst and gap discard metrics for use in a range of RTP applications. | Sep 2013 |
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IETF RFC 7005 | RTP Control Protocol (RTCP) Extended Report (XR) Block for De-Jitter Buffer Metric Reporting | Defines an RTP Control Protocol (RTCP) Extended Report (XR) block that allows the reporting of de-jitter buffer metrics for a range of RTP applications. | Sep 2013 |
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IETF RFC 7005 | RTP Control Protocol (RTCP) Extended Report (XR) Block for De-Jitter Buffer Metric Reporting | Defines an RTP Control Protocol (RTCP) Extended Report (XR) block that allows the reporting of de-jitter buffer metrics for a range of RTP applications. | Sep 2013 |
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IETF RFC 7266 | RTP Control Protocol (RTCP) Extended Report (XR) Blocks for Mean Opinion Score (MOS) Metric Reporting | Defines an RTP Control Protocol (RTCP) Extended Report (XR) Block including two new segment types and associated Session Description Protocol (SDP) parameters that allow the reporting of mean opinion score (MOS) Metrics for use in a range of RTP applications. | Jun 2014 |
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IETF RFC 7294 | RTP Control Protocol (RTCP) Extended Report (XR) Blocks for Concealment Metrics Reporting on Audio Applications | Defines two RTP Control Protocol (RTCP) Extended Report (XR) blocks that allow the reporting of concealment metrics for audio applications of RTP. | Jul 2014 |
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IETF RFC 8015 | RTP Control Protocol (RTCP) Extended Report (XR) Block for Independent Reporting of Burst/Gap Discard Metrics | Defines an RTP Control Protocol (RTCP) Extended Report (XR) block that allows the reporting of burst and gap discard metrics independently of the burst and gap loss metrics for use in a range of RTP applications. | Nov 2016 |
Internet Drafts
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IETF draft-ietf-sipping-rtcp-summary-00 | First Internet-Draft proposing the creation of the SIP RTCP Summary Report protocol. (Published as RFC 6035 in November 2010.) | Dec 2005 |
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IETF AVT Group draft-ietf-avt-rtcp-report-extns-00 | First Internet-Draft proposing the creation of the RTCP XR protocol. (Published as RFC 3611 in November 2003.) | Oct 2002 |
Standards Contributions from Telchemy
Following is a list of Telchemy contributions toward the development of technical standards.
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VQEG Hybrid Perceptual / Bitstream Group Test Plan | Draft version 2.9 of the Video Quality Experts Group Hybrid Perceptual/Bitstream Group test plan. This document describes a method for evaluating objective perceptual quality models submitted to VQEG that measure the quality of IP video and multimedia services including IPTV, Internet streaming, and mobile video. Telchemy provided a tool that implements scrambling of Packetized Elementary Stream (PES) and Transport Stream (TS) payloads, to test the ability of objective perceptual quality models to measure the quality of encrypted video. | Apr 2011 |
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ITU-T SG12 Interpretation of MOS for Video Services | Discusses the problem of interpreting MOS across different video formats such as SD, HD, and mobile, and proposes the terms "Relative MOS" (representing video quality relative to frame resolution) and "Absolute MOS" (representing video quality independent of frame resolution). | Jan 2011 |
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ITU-T SG12 Discussion of the Future of P.CQO-L/-E | Recommends retiring P.CQO-L (an objective model for predicting conversational quality in a telephone conversation) and focusing on the development of P.CQO-E, an enhanced model that does not share several limitations constraining P.CQO-L. | May 2010 |
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ITU-T SG12 G.IPTV-PMR - IPTV Performance Monitoring and Reporting | Draft recommendation defining an aggregation and reporting model for IPTV services. | Nov 2009 |
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ITU-T IPTV Focus Group IPTV Metrics | Proposes a set of QoS/QoE metrics for IPTV grouped into three categories: Perceptual Quality Metrics (including Video and Audio MOS), Video Stream Metrics (describing the codec, GoP structure and length, image size, and other key factors), and Transport Metrics (providing detailed data on packet loss before and after error correction such as FEC or Reliable UDP is applied). | Jan 2007 |
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ATIS IIF – QoSM Task Force: An Approach to In-Service Measurement of Video QoE | This contribution introduces an approach to video performance measurement based on estimation of PSNR. | Apr 2006 |
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ITU-T SG12 Performance Metrics for Fax and Modem over VoIP connections | Proposes two metrics, throughput index and reliability index, for estimating the performance of fax and modem communications over packet-based transport systems. | Oct 2005 |
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ITU-T SG12 Data Modem performance over VoIP connections | Describes the methodology and results of tests performed by Telchemy to evaluate the performance of data modems over an IP network. | Oct 2005 |
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ANSI TIA TR30 Proposed Model for IP Impairment Generation (ii) | Presents a model for generating IP impairments that represent real-world network conditions. (Adopted as ITU G.1050.) | Apr 2003 |
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ITU-T SG12 Packet Loss Distribution | Discusses the bursty nature of packet loss and proposes that a 4-state Markov model be used to more accurately represent packet loss distribution. | Jan 2003 |
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ITU-T SG12 Jitter Analysis | Discusses the characteristics of jitter (aka packet delay variation) and several approaches for measuring jitter. | Jan 2003 |
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ITU-T SG12 Modeling Burst Packet Loss in the E Model (i) | Discusses the modeling of burst packet loss within the context of the E Model, and recommends the use of a Gilbert-Elliot or 4-state Markov model to represent sparse burst packet loss conditions. | Jan 2003 |
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ITU-T SG12 Degradation Factors | Discusses the need to analyze degradation factors such as packet loss, discard, codec distortion, and delay when measuring VoIP quality. | Jan 2003 |
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ITU-T SG12 MOS Definitions | Proposes adding the qualifiers LQ and CQ to the Mean Opinion Score terminology to denote a listening quality score (MOS-LQ) and a conversational quality score (MOS-CQ). | Jan 2000 |
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ETSI TIPHON Practical Call Quality Metrics | Suggests updating TS101 329-5 Annex E (VQmon) to calculate separate R factor metrics for VoIP quality measurement: a 'User R Factor' which incorporates delay effects (suitable for converting to a MOS value) and a 'Network R Factor' which does not incorporate delay/recency effects on call quality. | Jul 2001 |
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ETSI TIPHON Comparison of TS 101 329-5 Annex E with E Model (i) | Compares the standard E Model with the extended E Model described in TS101 329-5 Annex E (VQmon), to confirm that Annex E provides a reasonable estimate of the effects of recency. | Jul 2001 |
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ETSI TIPHON Comparison of TS 101 329-5 Annex E with PSQM and PAMS (i) | Compares the TS101 329-5 Annex E (VQmon) voice quality monitoring technology with the PSQM and PAMS objective testing methods. | Jul 2001 |
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ATIS T1A1 Extensions to the E Model to incorporate the effects of time varying packet loss and recency (i) | Defines a set of extensions to the E Model (ITU-T G.107) that incorporate the effects of time-varying packet loss and recency of packet loss bursts on perceptual call quality. | Apr 2001 |
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ETSI TS 101 329-5 Quality of Service Measurement Methodologies (i) | Describes the ETSI TS 101 329-5 specification for measuring quality of service for IP telephony. | Nov 2000 |
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ETSI TIPHON Comparison of 5008 Annex E with Average Loss Model (i) | Provides a comparison between the Average Packet Loss model implied by G.113 and the Burst Packet Loss model described in 5008 Annex E. | Sep 2000 |
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ETSI TIPHON Proposal for Passive QoS Monitoring Methodology for Voice over IP (i) | Describes a method of passively monitoring VoIP Quality of Service. This method produces an R factor using an extension to the E-Model that incorporates the effects of packet loss burstiness and "recency". | Jul 2000 |