SIST-TP TR 101 329-1 V3.1.2:2004

• Abstract:

  Issues affecting quality of service for TIPHON current standardisation activities, minimum requirements for QOS and areas for further specif

• Status: Published
• Publication Date: 31-Mar-2004
• ICS: 33.020 - Telecommunications in general
• Technical Committee: SPN - Services and Protocols for Networks
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Apr-2004
• Due Date: 01-Apr-2004
• Completion Date: 01-Apr-2004
• Ref Project: ETSI TR 101 329-1 V3.1.2 (2002-01) - Telecommunications and Internet Protocol Harmonization Over Networks (TIPHON) Release 3; End-to-end Quality of Service in TIPHON systems; Part 1: General aspects of Quality of Service (QoS)

SIST-TP TR 101 329-1 V3.1.2:2004 is the Slovenian adoption of ETSI TR 101 329-1 V3.1.2 for TIPHON Release 3. It gives general aspects of end-to-end Quality of Service (QoS) in TIPHON systems, with a focus on voice telephony over IP networks and IP-to-SCN interworking. Engineers, planners, quality managers, and buyers can use it to understand the QoS terms, scenarios, and network elements that the TIPHON QoS series relies on.

What does SIST-TP TR 101 329-1 V3.1.2:2004 specify?

SIST-TP TR 101 329-1 V3.1.2:2004 provides QoS-related background information for IP networks that provide voice telephony in accordance with all TIPHON scenarios. It is not a class-definition or measurement-method document on its own; instead, it explains the QoS concepts, reference connections, and physical components that shape TIPHON voice performance.

The document is organized into scope, references, definitions and abbreviations, an introduction to end-to-end QoS, and a section that depicts each TIPHON scenario by its reference connection. Annex A contains the bibliography.

Annex	What it covers
Annex A	Bibliography

What are the key requirements of SIST-TP TR 101 329-1 V3.1.2:2004?

The report does not set out conformance tests, but it does establish the QoS concepts and reference views that TIPHON uses. In practice, it helps you decide which performance figures to measure, which network element may be influencing them, and how to interpret results across IP and SCN parts of a call.

Call set-up quality and call quality

Clause 4.1 separates end-to-end QoS into call set-up quality and call quality. Call set-up quality is mainly described by call set-up time, meaning the time from the caller’s final user action to the first meaningful progress indication. That matters because it is the user’s main signal of responsiveness.

Clause 4.1.2 treats call quality as the overall transmission quality rating R, calculated with the E-Model. The report assumes standard telephone handsets at both ends for this calculation. For a reader, this means handset type and connection type need to be kept consistent when comparing voice quality results.

What drives conversational speech quality

Clause 4.1.3 breaks conversational speech quality into listening quality, talking quality, interaction quality, and background noise transmission quality. These four parts map to the main things users notice in practice: clarity, echo and sidetone, turn-taking delay, and background noise from the far end. That breakdown helps a designer or tester link subjective complaints to specific network or terminal effects.

TIPHON-specific QoS factors

Clause 4.3 identifies factors that are especially relevant to TIPHON, including number of hops, changes in geographic path length during a call, congestion, prioritization or bandwidth reservation, and jitter behavior. This matters because TIPHON voice quality is not driven only by average throughput - packet routing and queueing can change the user experience even when the network is working normally.

Clause 4.3.1 explains delay jitter in packetized speech transport. Packets can arrive at different times, and if a packet arrives later than the receive buffer can accept, the speech in that packet is lost to decoding. In practice, this means late arrival is not just a timing issue - it can become audible speech loss.

Jitter buffers and how they affect voice quality

Clause 4.3.2 describes jitter buffers as receiving-end devices or software that regularize packet delivery to the decoder. It defines dejittering delay and jitter buffer size as measurable parameters. The practical point is simple: a larger buffer reduces timing variation but adds delay, while a smaller buffer reduces delay but can increase loss.

Clause 4.3.3 distinguishes static and dynamic jitter buffers. Static buffers are fixed or configured once, while dynamic buffers adapt to changing network delay. Clause 4.3.4 also notes that jitter can be quantified by statistical variance of interarrival time or by jitter amplitude, and that variance is the more meaningful measure. That helps readers choose a monitoring method that reflects real voice performance rather than just extremes.

Physical components that can affect QoS

Clause 4.4 lists the parts of a TIPHON system that may contribute to end-to-end QoS: IP terminal, IP access network, IP backbone, IWF (gateway/gatekeeper), SCN, and voice terminals connected to the SCN. The report then gives examples for each type.

For example, Clause 4.4.2 names LAN, PSTN, xDSL, cable modem, BRAN, DECT, UMTS, ISDN, and GSM access as possible IP access media. Clause 4.4.4 notes that IWF functions may be local or distributed. Clauses 4.4.5 and 4.4.6 show that SCN branches and connected voice terminals can vary widely in technology and operating mode, so QoS assessment must match the actual network path.

TIPHON scenarios and reference connections

Clause 5 depicts each TIPHON scenario by a reference connection and relates the five scenarios to ITU-T Recommendation G.177 connection arrangements. It also notes that the maximum geographical length of the reference connections is not defined. In practice, the figures give a common planning view for scenario 0 through scenario 4, which is useful when comparing IP-to-IP, IP-to-SCN, SCN-to-IP, SCN-to-SCN over IP, and IP-to-IP over SCN arrangements.

What terms does SIST-TP TR 101 329-1 V3.1.2:2004 define?

The document defines a small set of timing terms that are central to TIPHON QoS work.

• end-to-end delay jitter - the statistical variance of voice frame interarrival time, measured in milliseconds, used to describe timing variation in speech delivery.
• interarrival jitter - the statistical variance of RTP packet interarrival time, also measured in milliseconds, used for packet timing variation.
• jitter amplitude - the absolute difference in arrival time between the fastest and slowest packet or voice frame.
• IWF - InterWorking Function, the gateway/gatekeeper element that connects IP and SCN parts of a TIPHON connection.
• QoS - Quality of Service, the performance experienced by the user across the call path.
• RTP - Real Time Protocol, the packet format whose interarrival timing is used when assessing jitter in packet speech.
• SCN - Switched Communications Network, the non-IP network side that can interwork with TIPHON systems.

Who uses SIST-TP TR 101 329-1 V3.1.2:2004?

SIST-TP TR 101 329-1 V3.1.2:2004 is aimed at people working on IP telephony and interworking with traditional networks. That includes network engineers, voice service designers, terminal and gateway developers, test engineers, and quality managers.

It is especially useful for teams that need to compare QoS across TIPHON scenarios, select or assess access networks, interpret jitter and delay behavior, or plan voice performance at the interface between IP networks and SCN environments.

Which standards are used with SIST-TP TR 101 329-1 V3.1.2:2004?

Standard	Role in this report
ETSI EG 202 306	Provides guidelines for access networks for residential customers.
ETSI TS 101 312	Defines TIPHON network architecture and reference configurations for Scenario 1.
ETSI TS 101 329-2	Defines TIPHON QoS classes used alongside this general report.
ETSI TS 101 329-5	Gives QoS measurement methodologies referenced for delay and speech-quality measurement.
ITU-T E.600	Gives terms and definitions for traffic engineering, including post-dialling delay concepts.
ITU-T G.103	Provides general guidance on hypothetical reference connections.
ITU-T G.107	Defines the E-Model used to calculate overall transmission quality rating R.
ITU-T G.177	Provides connection arrangements for voiceband services over hybrid Internet/PSTN connections.
ITU-T I.350	Gives general aspects of QoS and network performance in digital networks.
ITU-T P.310	Covers transmission characteristics for telephone-band digital telephones.
TS 101 329-3	Companion TIPHON QoS part on signalling and control.
TR 101 329-6	Companion TIPHON QoS part on actual measurements of network and terminal characteristics.
TR 101 329-7	Companion design guide for TIPHON connection elements.
TS 102 024	Later Release 4 QoS document set noted in the foreword.
TS 102 025	Later Release 5 QoS document set noted in the foreword.

What does the SIST-TP TR 101 329-1 V3.1.2:2004 document contain?

The document contains the QoS overview, definitions, abbreviations, and a structured introduction to the main TIPHON performance topics. It includes a figure showing the structure of the TIPHON QoS documentation for Release 3, figures that illustrate delay jitter and jitter buffering, and figures for the five TIPHON scenario reference connections.

It also includes a comparison table that relates TIPHON scenarios to ITU-T G.177 connection arrangements. Annex A provides the bibliography, including the related TIPHON parts and later Release 4 and Release 5 references.

SLOVENSKI STANDARD
01-april-2004
Harmonizacija telekomunikacij in internetnega protokola prek omrežij (TIPHON), 3.
izdaja - Kakovost storitve od konca do konca v sistemih TIPHON - 1. del: Splošni
vidiki kakovosti storitve (QoS)
Telecommunications and Internet Protocol Harmonization Over Networks (TIPHON)
Release 3; End-to-end Quality of Service in TIPHON systems; Part 1: General aspects of
Quality of Service (QoS)
Ta slovenski standard je istoveten z: TR 101 329-1 Version 3.1.2
ICS:
33.020 Telekomunikacije na splošno Telecommunications in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

Technical Report
Telecommunications and Internet Protocol
Harmonization Over Networks (TIPHON) Release 3;
End-to-end Quality of Service in TIPHON systems;
Part 1: General aspects of Quality of Service (QoS)

2 ETSI TR 101 329-1 V3.1.2 (2002-01)

Reference
RTR/TIPHON-05007 [2]
Keywords
internet, telephony, quality
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All rights reserved.
ETSI
3 ETSI TR 101 329-1 V3.1.2 (2002-01)
Contents
Intellectual Property Rights.4
Foreword.4
Introduction .5
1 Scope.6
2 References.6
3 Definitions and abbreviations.6
3.1 Definitions.6
3.2 Abbreviations.7
4 Introduction to end-to-end Quality of Service (QoS).8
4.1 Main QoS parameters influenced by TIPHON systems .8
4.1.1 Call set-up quality.8
4.1.2 Call quality.8
4.1.3 Conversational speech quality .8
4.2 Further QoS parameters.9
4.3 TIPHON specific QoS relevant factors .9
4.3.1 Delay Jitter.9
4.3.2 Jitter buffers.10
4.3.3 Jitter Buffer Implementations .11
4.3.4 Jitter buffer monitoring capabilities.12
4.4 Physical components based on which a TIPHON service may be provided .12
4.4.1 IP terminal.12
4.4.2 IP access network .13
4.4.3 IP backbone.13
4.4.4 IWF (gateway/gatekeeper).13
4.4.5 SCN.13
4.4.6 Voice terminal connected to the SCN.14
5 Depiction of each TIPHON scenario by its reference connection.15
5.1 Reference connection for TIPHON scenario #0.15
5.2 Reference connection for TIPHON scenario #1.16
5.3 Reference connection for TIPHON scenario #2.16
5.4 Reference connection for TIPHON scenario #3.17
5.5 Reference connection for TIPHON scenario #4.17
Annex A: Bibliography.18
History .19

ETSI
4 ETSI TR 101 329-1 V3.1.2 (2002-01)
Intellectual Property Rights
IPRs essential or potentially essential to the present document 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); 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 (http://webapp.etsi.org/IPR/home.asp).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried 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.
Foreword
This Technical Report (TR) has been produced by ETSI Project Telecommunications and Internet Protocol
Harmonization Over Networks (TIPHON).
The present document is part 1 of a multi-part deliverable covering End-to-end Quality of Service in TIPHON systems,
as identified below:
TR 101 329-1: "General aspects of Quality of Service (QoS)";
TS 101 329-2: "Definition of speech Quality of Service (QoS) classes";
TS 101 329-3: "Signalling and control of end-to-end Quality of Service (QoS)";
TS 101 329-5: "Quality of Service (QoS) measurement methodologies";
TR 101 329-6: "Actual measurements of network and terminal characteristics and performance parameters in
TIPHON networks and their influence on voice quality";
TR 101 329-7: "Design guide for elements of a TIPHON connection from an end-to-end speech transmission
performance point of view".
Quality of Service aspects of TIPHON Release 4 and 5 Systems will be covered in TS 102 024 and
TS 102 025 respectively (see Bibliography), and more comprehensive versions of the Release 3 documents listed above
will be published as part of Release 4 and 5 as work progresses.
ETSI
5 ETSI TR 101 329-1 V3.1.2 (2002-01)
Introduction
The present document forms one of a series of technical specifications and technical reports produced by TIPHON
Working Group 5addressing Quality of Service (QoS) in TIPHON Systems. The structure of this work is illustrated in
figure 1.
Introduction Definition of 5
Speech Classes
TR 101 329-1 TS 101 329-2
General Speech
QoS
Aspects
of QoS Classes
SPEC
REPORT
Generic QoS
Specific Aspects of QoS
TS 101 329-5 TR 101 329-6 TR 101 329-7
TS 101 329-3
QoS Measure- Actual Design
Control ment Test Guidelines
Methods Results
SPEC REPORT REPORT
SPEC
QoS signalling Measurement Repository of Useful info for
requirements methodologies real test results designers

Figure 1: Structure of TIPHON QoS Documentation for Release 3
ETSI
6 ETSI TR 101 329-1 V3.1.2 (2002-01)
1 Scope
The present document presents QoS related background information for IP networks that provide voice telephony in
accordance with all TIPHON scenarios.
It contains:
- a depiction of each TIPHON scenario by its reference connection;
- an overview of the physical components based on which a TIPHON service may be provided.
2 References
For the purposes of this Technical Report (TR) the following references apply:
[1] ETSI EG 202 306: "Transmission and Multiplexing (TM); Access networks for residential
customers".
[2] ETSI TS 101 312: "Telecommunications and Internet Protocol Harmonization Over Networks
(TIPHON); Network architecture and reference configurations; Scenario 1".
[3] ETSI TS 101 329-2: "Telecommunications and Internet Protocol Harmonization over Networks
(TIPHON); End to End Quality of Service in TIPHON Systems; Part 2: Definition of Quality of
Service (QoS) Classes".
[4] ETSI TS 101 329-5: "Telecommunications and Internet protocol Harmonization Over Networks
(TIPHON) Release 3; Technology Compliance Specification; Part 5: Quality of Service (QoS)
measurement methodologies".
[5] ITU-T Recommendation E.600: "Terms and definitions of traffic engineering".
[6] ITU-T Recommendation G.103: "Hypothetical reference connections".
[7] ITU-T Recommendation G.107: "The E-Model, a computational model for use in transmission
planning".
[8] ITU-T Recommendation G.177: "Transmission planning for voiceband services over hybrid
Internet/PSTN connections".
[9] ITU-T Recommendation I.350: "General aspects of quality of service and network performance in
digital networks, including ISDNs".
[10] ITU-T Recommendation P.310: "Transmission characteristics for telephone-band (300-3 400 Hz)
digital telephones".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
end-to-end delay jitter: estimate of the statistical variance of the voice frames interarrival time measured in
milliseconds and expressed as an unsigned integer
NOTE: The end-to-end delay jitter is defined to be the mean deviation (smoothed absolute value) of the
difference in voice frame spacing at the receiver compared to the sender for a pair of voice frames.
ETSI
7 ETSI TR 101 329-1 V3.1.2 (2002-01)
interarrival jitter: estimate of the statistical variance of the RTP data packet interarrival time measured in milliseconds
and expressed as an unsigned integer
NOTE: The interarrival jitter is defined to be the mean deviation (smoothed absolute value) of the difference in
packet spacing at the receiver compared to the sender for a pair of packets.
jitter amplitude: absolute difference in arrival time between the fastest and the slowest data packet or voice frame
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ADSL Asymmetric Digital Subscriber Line
BRAN Broadband Radio Access Networks
FDM Frequency Division Multiplex
GSM Global System for Mobile communications
ISDN Integrated Services Digital Network
IP Internet Protocol
ITU International Telecommunication Union
ITU-T ITU Telecommunication Standardization Sector (former CCITT)
IWF InterWorking Function
LAN Local Area Network
PSTN Public Switched Telephone Network
QoS Quality of Service
RTP Real Time Protocol
SCN Switched Communications Network
TDM Time Division Multiplex
UMTS Universal Mobile Telecommunications System
VDSL Very High Speed Digital Subscriber Line
xDSL ADSL, VDSL and other Digital Subscriber Line Techniques
ETSI
8 ETSI TR 101 329-1 V3.1.2 (2002-01)
4 Introduction to end-to-end Quality of Service (QoS)
4.1 Main QoS parameters influenced by TIPHON systems
End-to-end QoS in a TIPHON system is characterized in the TIPHON QoS documentation under two broad headings:
• call set-up quality; and
• call quality.
4.1.1 Call set-up quality
Call set-up quality is mainly characterized by the call set-up time which is perceived by the user as the responsiveness
of the service. Call set-up time is the time elapsed from the end of the user interface command by the caller (keypad
dialling, E-mail alias typing, etc.) to the receipt by the caller of a meaningful progress information. The present
document provides the exact definition of the various call set-up times for use in TIPHON systems, whereas ITU-T
Recommendation E.600 [5] provides more information on the definition of post-dialling delay in SCN systems.
4.1.2 Call quality
Call quality is characterized by the overall transmission quality rating R. Overall transmission quality rating (R)
describes the full acoustic-to-acoustic (mouth to
...