ETSI TS 103 672 V1.1.1 (2020-12)

ETSI TS 103 672 V1.1.1 (2020-12)






TECHNICAL SPECIFICATION
Rail Telecommunications (RT);
Global System for Mobile communications (GSM);
Usage of Session Initiation Protocol
with ISUP encapsulation (SIP-I) and other IP based protocols
for interconnection of GSM-R networks

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2 ETSI TS 103 672 V1.1.1 (2020-12)



Reference
DTS/RT-0054
Keywords
GSM-R, IP, railways, SIP
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3 ETSI TS 103 672 V1.1.1 (2020-12)
Contents
Intellectual Property Rights . 6
Foreword . 6
Modal verbs terminology . 6
Introduction . 6
1 Scope . 8
2 References . 8
2.1 Normative references . 8
2.2 Informative references . 9
3 Definition of terms, symbols and abbreviations . 10
3.1 Terms . 10
3.2 Symbols . 10
3.3 Abbreviations . 10
4 Reference system architecture . 12
5 Interface functionality . 14
5.0 General description. 14
5.1 CS domain - transport of SIP-I, SCCP/MTP3, RTP/RTCP . 17
5.1.0 General information . 17
5.1.1 CS bearer services . 18
5.1.2 Teleservices . 18
5.1.2.0 General . 18
5.1.2.1 Speech (telephony, emergency calls) . 18
5.1.2.2 Short Message Service . 19
5.1.2.3 Facsimile transmission . 19
5.1.2.4 Voice Group Service (VGCS, VBS) . 19
5.1.3 GSM supplementary services . 20
5.1.3.0 General . 20
5.1.3.1 CLIP / CLIR . 20
5.1.3.2 CoLP / CoLR . 20
5.1.3.3 Call Forwarding (CFU, CFB, CFNRy, CFNRc) . 20
5.1.3.4 Call Waiting (CW) . 20
5.1.3.5 Call Hold (HOLD) . 21
5.1.3.6 Multi Party service (MPTY) . 21
5.1.3.7 Closed User Group (CUG) . 21
5.1.3.8 Advice of Charge (Information) (AoCI) . 21
5.1.3.9 Advice of Charge (Charging) (AoCC) . 21
5.1.3.10 Barring (BAOC, BOIC, BOIC-exHC, BAIC, BIC-Roam) . 21
5.1.3.11 Unstructured Supplementary Service Data (USSD) . 21
5.1.3.12 Follow me . 21
5.1.3.13 Sub-addressing . 21
5.1.3.14 eMLPP . 21
5.1.3.15 ECT . 22
5.1.3.16 Completion of Calls to Busy Subscribers (CCBS) . 22
5.1.3.17 User-to-User Signalling (UUS1) . 22
5.1.4 Railway specific services . 22
5.1.4.0 General . 22
5.1.4.1 Functional addressing. 22
5.1.4.2 Location dependent addressing . 22
5.1.4.3 Shunting mode . 22
5.1.4.4 Multiple driver communications . 22
5.1.4.5 REC / eREC . 22
5.1.5 IP/TDM interworking for the CS domain . 23
5.1.5.0 Introduction . 23
5.1.5.1 Interworking SIP-I with ISUP, Interworking SS7 . 24
ETSI

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4 ETSI TS 103 672 V1.1.1 (2020-12)
5.1.5.2 Interworking the bearer services . 25
5.2 PS domain - transport of GTP-C, DNS, GTP-U . 25
5.2.1 PS bearer services . 25
5.2.2 DNS services . 25
5.2.3 IP/TDM interworking for the PS domain . 25
6 Signalling interface. 25
6.0 General description. 25
6.1 Network layer protocol . 26
6.2 Transport layer protocols . 26
6.3 Signalling protocols . 27
6.3.1 SIP-I . 27
6.3.2 SS7 . 27
6.4 Interface functionality to signalling interface mapping . 28
6.4.1 CS domain - transport of SIP-I, SCCP/MTP3 . 28
6.4.1.1 CS bearer services . 28
6.4.1.2 Teleservices . 28
6.4.1.2.0 General . 28
6.4.1.2.1 Speech (telephony, emergency calls) . 28
6.4.1.2.2 Short Message Service . 30
6.4.1.2.3 Facsimile transmission . 30
6.4.1.2.4 Voice Group Service (VGCS, VBS) . 30
6.4.1.3 GSM supplementary services . 31
6.4.1.3.0 General . 31
6.4.1.3.1 CLIP / CLIR . 31
6.4.1.3.2 CoLP / CoLR . 31
6.4.1.3.3 Call Forwarding (CFU, CFB, CFNRy, CFNRc) . 31
6.4.1.3.4 Call Waiting (CW) . 31
6.4.1.3.5 Call hold (HOLD). 31
6.4.1.3.6 Multi Party service (MPTY) . 32
6.4.1.3.7 Closed User Group (CUG) . 32
6.4.1.3.8 Advice of Charge (Information) (AoCI) . 32
6.4.1.3.9 Advice of Charge (Charging) (AoCC) . 32
6.4.1.3.10 Barring (BAOC, BOIC, BOIC-exHC, BAIC, BIC-Roam) . 32
6.4.1.3.11 Unstructured Supplementary Service Data (USSD) . 32
6.4.1.3.12 Follow me . 32
6.4.1.3.13 Sub-addressing . 32
6.4.1.3.14 eMLPP . 32
6.4.1.3.15 ECT . 33
6.4.1.3.16 Completion of Calls to Busy Subscribers (CCBS) . 33
6.4.1.3.17 User-to-User Signalling (UUS1) . 33
6.4.1.4 Railway specific services . 33
6.4.1.4.0 General . 33
6.4.1.4.1 Functional addressing . 33
6.4.1.4.2 Location dependent addressing . 33
6.4.1.4.3 Shunting mode . 33
6.4.1.4.4 Multiple driver communications. 34
6.4.1.4.5 REC / eREC . 34
6.4.1.5 IP/TDM interworking for the CS domain (Use Case II) . 34
6.4.1.5.1 Interworking SIP-I with ISUP, interworking SS7 . 34
6.4.1.5.2 Interworking the bearer services . 34
7 Media interface . 35
7.0 General description. 35
7.1 Network layer protocol . 35
7.2 Transport layer protocols . 35
7.3 Real-Time Protocol / Real-Time Control Protocol . 35
7.4 Interface functionality to media interface mapping . 35
7.4.1 CS domain - transport of RTP, RTCP. 35
7.4.1.1 CS bearer services . 35
7.4.1.2 Teleservices . 36
7.4.1.2.0 General . 36
ETSI

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5 ETSI TS 103 672 V1.1.1 (2020-12)
7.4.1.2.1 Speech (telephony, emergency calls) . 36
7.4.1.2.2 Short Message Service . 36
7.4.1.2.3 Facsimile transmission . 36
7.4.1.2.4 Voice Group Service (VGCS, VBS) . 36
7.4.1.3 GSM supplementary services . 37
7.4.1.3.0 General . 37
7.4.1.3.1 CLIP / CLIR . 37
7.4.1.3.2 CoLP / CoLR . 37
7.4.1.3.3 Call Forwarding (CFU, CFB, CFNRy, CFNRc) . 37
7.4.1.3.4 Call Waiting (CW) . 37
7.4.1.3.5 Call hold (HOLD). 37
7.4.1.3.6 Multi Party service (MPTY) . 37
7.4.1.3.7 Closed User Group (CUG) . 37
7.4.1.3.8 Advice of Charge (Information) (AoCI) . 37
7.4.1.3.9 Advice of Charge (Charging) (AoCC) . 37
7.4.1.3.10 Barring (BAOC, BOIC, BOIC-exHC, BAIC, BIC-Roam) . 37
7.4.1.3.11 Unstructured Supplementary Service Data (USSD) . 37
7.4.1.3.12 Follow me . 37
7.4.1.3.13 Sub-addressing . 38
7.4.1.3.14 eMLPP . 38
7.4.1.3.15 ECT . 38
7.4.1.3.16 Completion of Calls to Busy Subscribers (CCBS) . 38
7.4.1.3.17 User-to-User Signalling (UUS1) . 38
7.4.1.4 Railway specific services . 38
7.4.1.4.1 Functional addressing . 38
7.4.1.4.2 Location dependent addressing . 38
7.4.1.4.3 Shunting mode . 38
7.4.1.4.4 Multiple driver communications. 38
7.4.1.4.5 REC / eREC . 38
7.4.1.5 IP/TDM interworking for the CS domain (Use Case II) . 38
7.4.1.5.1 Interworking SIP-I with ISUP, interworking SS7 . 38
7.4.1.5.2 Interworking the bearer services . 38
Annex A (normative): Locating SIP entities . 39
Annex B (informative): Quality of service framework . 40
Annex C (informative): Group call control - additional information . 41
History . 42

ETSI

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6 ETSI TS 103 672 V1.1.1 (2020-12)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables 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 (https://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.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
This Technical Specification (TS) has been produced by ETSI Technical Committee Railway Telecommunications
(RT).
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "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
In most of the GSM-R system deployments available at the time of the creation of the present document, the GSM-R
Networks are interconnected using TDM based interfaces.
The present document deals with the introduction of IP interconnection towards external networks using SIP-I as a call
control protocol, which seems to be beneficial both for operators and for network element vendors. ISUP
interconnection and the supporting hardware elements are getting old and less effective compared to the new IP based
interconnection methods already used in public networks.
In addition, the present document deals with MTP3 and MTP2 interworking between IP based interfaces and TDM
based interfaces.
SIP-I is a modern, IP-based call control protocol to be used between core networks. It is applicable in particular, if the
ISDN service interworking is kept completely.
While a number of interoperability specifications for various interfaces at various layers of GSM-R systems exist, the IP
interface between GSM-R networks has not yet been addressed by any interoperability specification activity.
The present document addresses the interoperability specification between any two GSM-R Core Networks, where at
least one of the networks uses IP based transport (Internet Protocol (IP) IETF RFC 791 [2]) for the interconnection.
ETSI

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7 ETSI TS 103 672 V1.1.1 (2020-12)
In addition to the table of contents, the following explanation will help you navigate through and understand the
contents of the present document:
• Clauses 1 to 3 are predefined by ETSI.
• Clause 4 shows and explains the reference system architecture and identifies the interface(s) for the present
document.
• Clause 5 holds the functional requirements for the interfaces subject to the present document.
• Clause 6 specifies in detail the signalling interfaces for all supported functions and services.
• Clause 7 specifies in detail the media interfaces.
ETSI

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8 ETSI TS 103 672 V1.1.1 (2020-12)
1 Scope
The present document defines the IP based signaling and media interfaces between any two GSM-R Core networks of a
set of
...