ETSI TR 103 279 V1.1.1 (2014-08)

End to End Network Architectures (E2NA); Location of Transcoders for voice and video communications

DTR/E2NA-00006-Loc-Transcoders

General Information

• Status: Published
• Publication Date: 28-Aug-2014
• Technical Committee: E2NA - End-to-End Network Architectures
• Current Stage: 12 - Completion
• Due Date: 08-Sep-2014
• Completion Date: 29-Aug-2014

Standards Content (Sample)

ETSI TR 103 279 V1.1.1 (2014-08)






TECHNICAL REPORT
End to End Network Architectures (E2NA);
Location of Transcoders for voice and video communications

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2 ETSI TR 103 279 V1.1.1 (2014-08)



Reference
DTR/E2NA-00006-Loc-Transcoders
Keywords
codec, interconnection, transcoding
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3 ETSI TR 103 279 V1.1.1 (2014-08)
Contents
Intellectual Property Rights . 4
Foreword . 4
Modal verbs terminology . 4
Introduction . 4
1 Scope . 5
2 References . 5
2.1 Normative references . 5
2.2 Informative references . 5
3 Definitions and abbreviations . 5
3.1 Definitions . 5
3.2 Abbreviations . 6
4 Background . 6
5 Review of standards and technical specifications . 6
5.1 Interconnection between service provider networks . 6
5.1.1 Interconnection between circuit-switched networks . 6
5.1.1.1 Direct interconnection between fixed service provider networks . 6
5.1.1.2 Direct interconnection between mobile service provider networks . 7
5.1.1.3 Direct interconnection between a fixed and a mobile service provider network . 7
5.1.1.4 Non-direct interconnection between service provider networks . 7
5.1.2 Interconnection between a circuit-switched service provider network and an IP-based service
provider network . 7
5.1.2.1 Direct interconnection between fixed service provider networks . 7
5.1.2.2 Direct interconnection between mobile service provider networks . 7
5.1.2.3 Direct interconnection between a fixed and a mobile service provider network . 7
5.1.2.4 Non-direct interconnection between service provider networks . 7
5.1.3 Interconnection between IP-based service provider networks . 8
5.1.3.1 Direct interconnection . 8
5.1.3.2 Non-direct interconnection . 8
5.2 Location of transcoders inside networks . 8
5.2.1 Circuit-switched service provider networks . 8
5.2.1.1 Fixed networks . 8
5.2.1.2 Mobile Networks . 8
5.2.2 VoIP service provider networks . 9
5.2.2.1 IMS . 9
5.2.2.2 Other networks . 9
6 Gap Analysis . 9
7 Recommendations . 9
7.1 Guidance for service providers . 9
7.2 Suggested additions to existing standards . 10
History . 11

ETSI

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4 ETSI TR 103 279 V1.1.1 (2014-08)
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://ipr.etsi.org).
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 End-to-End Network Architectures (E2NA).
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "may not", "need", "need not", "will",
"will not", "can" and "cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms
for the expression of provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
Introduction
As the number of voice and video codecs available on the market place increases, resorting to transcoding functions
becomes unavoidable. There seems to be little guidance on where to implement and invoke these functions within and
between networks. Which network (e.g. the originating, transit or terminating network, the fixed or the mobile network)
should be responsible for transcoding and which entity inside this network (e.g. home gateway, edge gateway, border
gateway, trunking gateway, specialized media gateway in the core network, etc.) should perform transcoding are typical
questions that have to be answered to ensure successful call setup procedures with optimal end-to-end quality of
experience.
ETSI

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5 ETSI TR 103 279 V1.1.1 (2014-08)
1 Scope
The present document provides a review of standardization activities on the location of transcoders for voice and video
communications inside and across networks. It identifies issues that are not addressed in current standards and provides
recommendations to fill these gaps.
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee
their long term validity.
2.1 Normative references
The following referenced documents are necessary for the application of the present document.
Not applicable.
2.2 Informative references
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
TM
[i.1] GSMA IN.24: "Voice IPX break in - out interworking scenarios recommendation on IPX
th
Hubbing Quality", Version 1.1, 12 February 2013.
[i.2] i3 forum document: "Voice path engineering in international IP-based networks", Release 3,
May 2011.
[i.3] ETSI TS 123 228: "Digital cellular telecommunications system (Phase 2+); Universal Mobile
Telecommunications System (UMTS); LTE; IP Multimedia Subsystem (IMS); Stage 2
(3GPP TS 23.228)".
[i.4] ETSI TS 123 153: "Digital cellular telecommunications system (Phase 2+); Universal Mobile
Telecommunications System (UMTS); LTE; Out of band transcoder control; Stage 2
(3GPP TS 23.153)".
3 Definitions and abbreviations
3.1 Definitions
For the purposes o
...