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 6390 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 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 AVT Group RFC 3611 (RTCP XR) VoIP metrics (ii) | 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 |
Internet Drafts
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IETF AVT Group RTCP XR MIB (ii) | Defines Management Information Base objects for managing RTCP XR VoIP Metrics (RFC 3611). |
Mar
2006 |
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IETF AVT Group RTCP XR High Resolution Metrics | Defines extensions to the RTCP XR extended report packet type blocks to support VoIP monitoring for services that require higher resolution or more detailed metrics than those supported by RFC 3611. |
Mar
2006 |
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IETF AVT Group RTCP XR Video Metrics | Defines extensions to the RTCP XR extended report packet type blocks to support Video over IP monitoring for IPTV and videoconferencing endpoint reporting. |
Mar
2006 |
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IETF AVT Group RTP MIB V2 | Defines Management Information Base objects for managing Real-Time Transport Protocol (RTP) systems (RFC 3550). |
Feb
2006 |
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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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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
2003 |
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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 |
(i) Telchemy DOES have granted patents related to the technology described in this contribution
(ii) Telchemy DOES NOT claim IPR related to the technology described in this contribution
Telchemy MAY have IPR related to some aspects of options or implementations related to other contributions
WARNING: Telchemy does have a wide range of IPR and some of our standards contributions may contain material covered by patent applications. As a matter of policy, we do disclose this IPR to the relevant committee and make appropriate declarations with regard to the inclusion of our IPR in published standards. We do not grant rights to our IPR in relation to contributions that we make that are not incorporated into published standards. In situations where we make declarations to one committee with regard to a published standard and that standard is subsquently referenced by other committees we may not disclose to the other committees that we have IPR - as we have no way to know if and when one committee may reference the work of another. The contributions listed above DO in many cases incorporate Telchemy IPR, and hence we advise that you check with us or with the appropriate standards organization prior to incorporating any of the ideas described into any product, technology or service.
For more information about Telchemy patents, please see our Patent Portfolio.