SIST-TS TS 102 024-9 V4.1.1:2004

SLOVENSKI STANDARD
SIST-TS TS 102 024-9 V4.1.1:2004
01-april-2004
Harmonizacija telekomunikacij in internetnega protokola prek omrežij (TIPHON), 4.
izdaja - Kakovost storitve od konca do konca v sistemih TIPHON - 9. del:
Klasifikacija zmogljivosti klica (govor)
Telecommunications and Internet Protocol Harmonization Over Networks (TIPHON)
Release 4; End-to-End Quality of Service in TIPHON Systems; Part 9: Call performance
Classification (Voice)
Ta slovenski standard je istoveten z: TS 102 024-9 Version 4.1.1
ICS:
33.020 Telekomunikacije na splošno Telecommunications in
general
SIST-TS TS 102 024-9 V4.1.1:2004 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TS TS 102 024-9 V4.1.1:2004

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SIST-TS TS 102 024-9 V4.1.1:2004

ETSI TS 102 024-9 V4.1.1 (2003-01)
Technical Specification


Telecommunications and Internet Protocol
Harmonization Over Networks (TIPHON) Release 4;
End-to-end Quality of Service in TIPHON Systems;
Part 9: Call performance Classification (Voice)

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SIST-TS TS 102 024-9 V4.1.1:2004
 2 ETSI TS 102 024-9 V4.1.1 (2003-01)



Reference
DTS/TIPHON-05016R4
Keywords
IP, performance, QoS, telephony, voice, VoIP
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© European Telecommunications Standards Institute 2003.
All rights reserved.

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SIST-TS TS 102 024-9 V4.1.1:2004
 3 ETSI TS 102 024-9 V4.1.1 (2003-01)
Contents
Intellectual Property Rights.4
Foreword.4
1 Scope.5
2 References.5
3 Definitions and abbreviations.6
3.1 Definitions.6
3.2 Abbreviations.6
4 Parameters.6
4.1 Signalling failure probability.6
4.1.1 Call Setup Failure Probability.6
4.1.2 Call setup error probability.8
4.1.3 Signalling route unavailability.8
4.1.4 Call Premature Release Probability .8
4.1.5 Call Release Failure Probability .8
4.1.6 Percentage of unsuccessful call attempts .9
4.2 Call signalling delays .9
4.2.1 Call setup delay.9
4.2.2 Call Answer Signal Delay.9
4.2.3 Call Release Delay.10
Annex A (normative): Summary of objectives .11
Annex B (informative): Signalling reference connection.12
B.1 General.12
B.2 TIPHON call signalling elements.12
B.3 Signal processing delays of TIPHON components .14
B.4 Total Signalling processing delay for call setup.16
B.4.1 Intra-domain TIPHON connection .17
B.4.2 Inter-domain TIPHON connections.17
B.4.3 Inter-domain connections involving TIPHON and Switched Circuit networks .18
B.4.4 Inter-domain connections involving roaming.19
History .20

ETSI

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SIST-TS TS 102 024-9 V4.1.1:2004
 4 ETSI TS 102 024-9 V4.1.1 (2003-01)
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).
All published ETSI deliverables shall include information which directs the reader to the above source of information.
Foreword
This Technical Specification (TS) has been produced by ETSI Project Telecommunications and Internet Protocol
Harmonization Over Networks (TIPHON).
The present document is part 9 of a multi-part deliverable covering the End-to-end Quality of Service in TIPHON
Systems, as identified below:
TR 102 024-1: "General aspects of Quality of Service (QoS)";
TS 102 024-2: "Definition of Speech Quality of Service (QoS) Classes";
TS 102 024-3: "Signalling and Control of End-to-end Quality of Service (QoS) in a multi-media environment";
TS 102 024-4: "Quality of Service Management";
TS 102 024-5: "Quality of Service (QoS) measurement methodologies";
TR 102 024-6: "Actual measurements of network and terminal characteristics and Performance parameters in
TIPHON networks and their influence on voice quality";
TR 102 024-7: "Design Guide for elements of a TIPHON connection from an End-to-end speech transmission
performance point of view";
TS 102 024-9: "Call performance Classification (Voice)";
TS 102 024-10: "QoS Requirements for TIPHON Terminals".
ETSI

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SIST-TS TS 102 024-9 V4.1.1:2004
 5 ETSI TS 102 024-9 V4.1.1 (2003-01)
1 Scope
The present document, "TIPHON call performance classification", specifies the signalling aspects associated with the
control of End-to-end QoS within and between TIPHON domains for Voice over IP. It defines call and media
processing parameters, bounds on the values of these parameters and a possible classification system. The specified
parameters apply to session and media flow set-up and close-down as well as to mid-session changes and include issues
of signalling accuracy, signalling latency and signalling reliability.
NOTE: The present document only applies to guaranteed QoS classes. Hence it is not applicable to the best effort
class.
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 and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
[1] ETSI TS 101 314: "Telecommunications and Internet Protocol Harmonization Over Networks
(TIPHON) Release 3; Abstract Architecture and Reference Points Definition; Network
Architecture and Reference Points".
[2] ETSI TS 101 882: "Telecommunications and Internet Protocol Harmonization Over Networks
(TIPHON) Release 3; Protocol Framework Definition; General (meta-protocol)".
[3] ITU-T Recommendation Y.1530 (February 2002): "Call processing performance for voice service
in hybrid IP networks".
[4] ITU-T Recommendation Y.1541: "Network performance objectives for IP-based services".
[5] ITU-T Recommendation Q.766: "Performance objectives in the integrated services digital network
application".
[6] ITU-T Recommendation Q.706: "Message transfer part signalling performance".
[7] ITU-T Recommendation Q.709: "Hypothetical signalling reference connection".
[8] Directive 98/10/EC of the European Parliament and of the Council of 26 February 1998 on the
application of open network provision (ONP) to voice telephony and on universal service for
telecommunications in a competitive environment.
ETSI

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SIST-TS TS 102 024-9 V4.1.1:2004
 6 ETSI TS 102 024-9 V4.1.1 (2003-01)
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
unsuccessful call: call attempt to a valid number, properly dialled following dial tone, where neither called party busy
tone, nor ringing tone, nor answer signal, is recognized on the access line of the calling user within 30 s from the instant
when the address information required for setting up a call is received by the network
unsuccessful call ratio: ratio of unsuccessful calls to the total number of call attempts in a specified time period
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
CASD Call Answer Signal Delay
CPDP Call Premature Disconnect Probability
CPRP Call Premature Release Probability
CRFP Call Release Failure Probability
CRD Call Release Delay
CSD Call Setup Delay
CSEP Call Setup Error Probability
CSFP Call Setup Failure Probability
DNS Domain Name Server
FFS For Further Study
ISDN Integrated Service Digital Network
QoS Quality of Service
SCN Switched Circuit Network
TE Terminal Equipment
4 Parameters
In this clause a set of parameters and values is proposed for consideration for the specification of the call completion
performance classification.
4.1 Signalling failure probability
4.1.1 Call Setup Failure Probability
The Call Setup Failure Probability (CSFP) is the ratio of total call setup attempts that result in call setup failure to the
total call setup attempts in a population of interest.

(a)
(b)
(c)
(d)
    B     B
i j
Originating side Terminating side

Figure 1: Reference events occurring during successful call setup
ETSI

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SIST-TS TS 102 024-9 V4.1.1:2004
 7 ETSI TS 102 024-9 V4.1.1 (2003-01)
With reference to figure 1, the CSFP is defined to occur on any call setup attempt in which either one of the following
outcomes is observed prior to expiration of timer T :
max
• both events (b) and (d) do not occur;
• events (b) and (c) occur, but event (d) does not.
Events (a) to (d) are observable events at specific reference points:
(a) illustrates setup at originating side;
(b) illustrates setup at terminating side;
(c) illustrates alerting at terminating side;
(d) illustrates alerting at originating side.
The reference points for TIPHON Release 4, corresponding to reference points B and B in figure 1 are specified
i j
in TS 101 314 [1]. The events occurring at those reference points correspond to specific TIPHON Metaprotocol
messages as defined in TS 101 882 [2].
In case of TIPHON Scenario 0, reference point B in figure 1 relates to reference point C1 at the originating side, while
i
B relates to reference point C1 at the terminating side. Reference point B relates to TIPHON reference point C3 in case
j j
of TIPHON scenario 1. B relates to TIPHON reference point C3 in case of TIPHON scenario 2.
i
The relationship between events (a) to (d) and the TIPHON Metaprotocol messages are as follows:
(a) corresponds to the entry of U_CallRequest at reference point C1 between the originating terminal device and the
SpoA for call control;
(b) corresponds to the exit of D_CallRequest at reference point C1 between the terminating SpoA and the
terminating terminal device;
(c) corresponds to the entry of U_CallAltert at reference point C1 between the terminating terminal device and the
terminating SpoA;
(d) corresponds to the exit of D_CallReport at reference point C1 between the originating SpoA and the
originating terminal device.
NOTE 1: The exact value of T is for further study.

max
NOTE 2: Call setup attempts that are cleared by the network portion as a result of incorrect performance or
non-performance on the part of an entity outside the network portion are excluded.
NOTE 3: A call setup attempt can fail as a result of user blocking. Such failures are excluded from network
performance measurement. Examples of user blocking include the following:
- the called user issues a message to reject the call setup attempt;
- the connect message reference event fails to occur at the originating MPT boundary due to the lack
of a connect message reference event at the terminating MPT boundary;
- the called user delays excessively in generating the connect message reference event during the call
period, with the result that a call is not established before the time-out;
- all channels at the called TE are in use.
-5
Objective: The Call Setup Failure Probability as defined above for a TIPHON network shall not exceed 3 x 10 .
NOTE 4: This is a provisional value. The actual target value is for further study.
ETSI

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SIST-TS TS 102 024-9 V4.1.1:2004
 8 ETSI TS 102 024-9 V4.1.1 (2003-01)
4.1.2 Call setup error probability
Call setup error probability is the ratio of total call setup attempts that result in call setup error to the total call setup
attempts in a population of interest.
With reference to figure 1, a call setup error is defined to occur on any call setup attempt in which event (d) occurs, but
event (c) does not occur at an appropriate boundary prior to expiration of timer T.
Call setup error is essentially the case of a network-caused "wrong number". It occurs when the network responds to a
valid call request by erroneously establishing a call to a destination Terminal Equipment (TE) other than the one
designated in the call request, and does not correct the error prior to the user information transfer. It may be caused, for
example, by network operator administrative or maintenance actions.
Call setup error is distinguished from successful call setup by the fact that the intended called user is not contacted and
not committed to the session during the call setup attempt.
4.1.3 Signalling route unavailability
Important remark: The signalling route unavailability parameter is only applicable to the SCN network portions of
TIPHON systems. Hence it is not an End-to-end parameter.
The availability of a signalling route set is determined by the availability of the individual components of the signalling
network and by the structure of the signalling network. (i.e. the arrangements for redundancy and alternative routing in
the event of the unavailability of a component.)
ITU-T recommendation [6] Q.706, clause 1.1, recommends that the availability of a signalling route set should be not
less than 0,99998. This corresponds to a downtime of not more than ten minutes per year.
4.1.4 Call Premature Release Probability
The Call Premature Release Probability (CPRP) for a network portion is the probability, in any given second, that a call
experiences a premature disconnect generated within that portion.
A premature disconnect is defined as an occurrence of a Disconnect request or a Release message [2] exiting the
network portion at its originating or terminating network boundary,
• either in the absence of a previous corresponding Modify or Release message occurring at the other boundary
of the network;
• or when a premature disconnect stimulus occurs within the network boundaries and is transferred across its
originating or terminating boundaries.
The network portion boundaries are the same (B , B ) as shown in figure 1. They also correspond to the reference point
i j
between FE5 and FE6 for the originating side of a TIPHON network and the reference point between FE8 and FE9 for
the terminating side.
-5
Objective: The Call Premature Disconnect Probability (CPDP) as defined in this clause should not exceed 1,5 x 10 .
NOTE: This is a provisional value. The actual target value is for further study.
4.1.5 Call Release Failure Probability
The Call Release Failure Probability (CRFP) is the ratio of total call clearing failures to the total call clearing attempts
in a population
...