ETSI TS 102 744-4-1 V1.1.1 (2015-10)

ETSI TS 102 744-4-1 V1.1.1 (2015-10)






TECHNICAL SPECIFICATION
Satellite Earth Stations and Systems (SES);
Family SL Satellite Radio Interface (Release 1);
Part 4: Enhanced Services and Applications;
Sub-part 1: Multiple Voice Services

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2 ETSI TS 102 744-4-1 V1.1.1 (2015-10)



Reference
DTS/SES-00299-4-1
Keywords
3GPP, GPRS, GSM, GSO, interface, MSS, radio,
satellite, TDM, TDMA, UMTS
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© European Telecommunications Standards Institute 2015.
All rights reserved.

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DECT , PLUGTESTS , UMTS and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members.
TM
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GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association.
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3 ETSI TS 102 744-4-1 V1.1.1 (2015-10)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 5
Introduction . 5
1 Scope . 6
2 References . 6
2.1 Normative references . 6
2.2 Informative references . 6
3 Symbols and abbreviations . 6
3.1 Symbols . 6
3.2 Abbreviations . 6
4 General . 7
4.1 Overview . 7
4.2 System architecture . 7
4.3 Access to the VoIP domain . 8
5 Mobile PBX Requirements . 9
5.1 General Requirements . 9
5.1.1 Number of Concurrent Calls . 9
5.1.2 Support for Direct Inward Dialling . 9
5.1.3 Support for Short Code Dialling . 9
5.1.4 Support for Call Barring . 10
5.1.5 Configuration Requirements . 10
5.2 Functional Requirements . 10
5.2.1 Domain Selection Requirements . 10
5.2.2 Circuit Switched Call Handling Requirements . 10
5.2.2.1 CS Domain Supplementary Services Requirements . 10
5.2.2.2 Support for Direct Inward Dialling in the CS Domain . 10
5.2.2.3 Call Waiting in the CS Domain. 10
5.2.2.3.0 General . 10
5.2.2.3.1 CS Voice Calls . 11
5.2.3 Domain Independent Supplementary Services Settings. 11
5.3 Protocol Requirements . 11
5.3.0 General . 11
5.3.1 Session Management Requirements . 11
5.3.1.0 General . 11
5.3.1.1 Primary PDP Context Activation . 11
5.3.1.2 Secondary PDP Context Definition . 12
5.3.1.3 Secondary PDP Context Activation, Modification and Deactivation . 12
5.3.2 SIP Protocol Requirements . 13
5.3.2.0 General . 13
5.3.2.1 SIP Registration . 13
5.3.2.2 SIP Options . 13
5.3.2.3 SIP Call Setup (originating from PBX) . 13
5.3.2.4 SIP Call Setup (terminating on PBX). 13
5.3.2.5 SIP Call Maintenance . 14
5.3.3 Media Handling Requirements . 14
5.3.3.1 Codec . 14
5.3.3.2 Codec Frame Packetization . 14
5.3.3.3 DTMF Handling . 14
5.3.4 SIP Domain Supplementary Services Requirements . 14
5.3.4.1 Calling Number Presentation on Inbound Calls . 14
5.3.4.2 Calling Number Presentation on Outbound Calls . 15
5.3.4.3 Supplementary Services Settings related to Calling Number Delivery . 15
5.3.4.4 Call Waiting and Call Hold in the SIP Domain . 15
ETSI

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4 ETSI TS 102 744-4-1 V1.1.1 (2015-10)
Annex A (normative): VoIP Domain Call Service Codes . 16
History . 17

ETSI

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5 ETSI TS 102 744-4-1 V1.1.1 (2015-10)
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 Specification (TS) has been produced by ETSI Technical Committee Satellite Earth Stations and
Systems (SES).
The present document is part 4, sub-part 1 of a multi-part deliverable. Full details of the entire series can be found in
ETSI TS 102 744-1-1 [4].
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
This multi-part deliverable (Release 1) defines a satellite radio interface that provides UMTS services to users of mobile
terminals via geostationary (GEO) satellites in the frequency range 1 518,000 MHz to 1 559,000 MHz (downlink) and
1 626,500 MHz to 1 660,500 MHz and 1 668,000 MHz to 1 675,000 MHz (uplink).
ETSI

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6 ETSI TS 102 744-4-1 V1.1.1 (2015-10)
1 Scope
The present document specifies the mandatory requirements for User Equipment (UE) implementing multiple voice
communications via the Voice-over-IP (VoIP) service for the Family SL satellite radio interface.
2 References
2.1 Normative 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
reference 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.
The following referenced documents are necessary for the application of the present document.
[1] IETF RFC 3261 (2002): "SIP: Session Initiation Protocol", J. Rosenberg.
[2] IETF RFC 4733 (2006): "RTP Payload for DTMF Digits, Telephony Tones and Telephony
Signals", H. Schulzrinne.
[3] ETSI TS 102 744-1-4: "Satellite Earth Stations and Systems (SES); Family SL Satellite Radio
Interface (Release 1); Part 1: General Specifications; Sub-part 4: Applicable External
Specifications, Symbols and Abbreviations".
[4] ETSI TS 102 744-1-1: "Satellite Earth Stations and Systems (SES); Family SL Satellite Radio
Interface (Release 1); Part 1: General Specifications; Sub-part 1: Services and Architectures".
[5] ETSI TS 124 008: "Digital cellular telecommunications system (Phase 2+); Universal Mobile
Telecommunications System (UMTS); LTE; Mobile radio interface Layer 3 specification; Core
network protocols; Stage 3 (3GPP TS 24.008)".
2.2 Informative 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
reference document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
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.
Not applicable.
3 Symbols and abbreviations
3.1 Symbols
For the purposes of the present document, the symbols given in ETSI TS 102 744-1-4 [3], clause 3 apply.
3.2 Abbreviations
For the purposes of the present document, the abbreviations given in ETSI TS 102 744-1-4 [3], clause 3 apply.
ETSI

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7 ETSI TS 102 744-4-1 V1.1.1 (2015-10)
4 General
4.1 Overview
The Circuit Switched (CS) domain is designed to carry only one active voice call per subscriber identity at any time.
For User Equipment (UE) that is shared among users, e.g. on ships or aircraft, it is desirable to overcome this limitation
and to offer the ability to handle more than one concurrent voice call.
Additional voice calls can be provided by a Voice-over-IP (VoIP) service domain using the Packet Switched (PS)
domain as its transport. The general principle of operation assumes that the first preference is to use the CS domain to
set up a call. Only if the CS domain is unavailable (i.e. one voice call is already in progress between the user and
another party), will any additional calls be set up using the VoIP domain.
The present document specifies the mandatory requirements for equipment implementing a User Agent in the VoIP
service domain. This User Agent is essentially providing a Private Branch Exchange (PBX) in the mobile domain, as
shown in Figure 4.1, and is therefore referred to as "Mobile PBX" throughout the present document.

Figure 4.1: Equipment Configuration for support of Multiple Voice service
A Mobile PBX can be implemented either as an integral part of a UE or as external hardware that can be connected to
an existing UE. In general, the requirements specified in the present document apply to both implementations unless
indicated otherwise.
4.2 System architecture
The solution described in the present document is based upon the integration of a VoIP domain containing infrastructure
operating in tandem with the Circuit Switched domain and operating via the Packet Switched Domain. A simplified
representation of the overall system architecture is represented in Figure 4.2, where the VoIP domain is functionally
provided by a VoIP server.
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8 ETSI TS 102 744-4-1 V1.1.1 (2015-10)

Figure 4.2: Overall System Architecture for support of Multiple Voice service
A new VoIP Domain, provided via a VoIP server, is introduced into the Family SL ground segment, and provides an
interface between the existing Circuit Switched domain and the Packet Switched domain for transport of multiple voice
calls when the single CS voice circuit towards a mobile terminal is busy.
The interface with the PSTN is handled by the existing Circuit Switched domain for both mobile terminated and mobile
originated calls. The existing voice mail system will be used to support per-MSISDN voice mail.
Multiple MSISDN numbers are allocated to the subscriber. These numbers may be allocated to individual handsets by
configuration of the mobile terminal or the external VoIP PBX. Alternatively functionality may be provided in the
mobile terminal or VoIP PBX to determine which handset to alert upon Mobile Terminated call initiation utilizing the
primary MSISDN.
4.3 Access to the VoIP domain
The Mobile Terminal registers with the Radio Access Network and then initiates an Attach procedure towards both the
CS and PS domains. During these Attach procedures the MT is authenticated, and Security Mode procedures are
initiated to secure the signalling and user-plane between the Radio Access Network and the Mobile Terminal.
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Figure 4.3: Simplified Presentation of Initial Access Procedure
Conditional on successful CS and PS attach procedures , the mobile terminal initiates a background Primary PDP
context towards the Inmarsat VoIP APN, which is authorized by the HLR if the subscriber is granted access to Multiple
Voice services. Conditional on the Mobile Terminal subscriber being authorized to access VoIP domain infrastructure,
an IP address is allocated to the mobile terminal and the PDP context activated.
The Mobile Terminal then performs a DNS lookup to obtain the IP address of the SIP server within the VoIP domain
(the fully qualified domain name of the SIP server will be configured in the Mobile Terminal). The Mobile Terminal
then initiates a SIP registration procedure towards the SIP server.
5 Mobile PBX Requirements
5.1 General Requirements
5.1.1 Number of Concurrent Calls
The Mobile PBX shall support a minimum of four concurrent voice calls (one call placed via the CS domain and an
additional three placed through the PS domain). I
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