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TECHNICAL SPECIFICATION
Digital cellular telecommunications system (Phase 2+) (GSM);
Universal Mobile Telecommunications System (UMTS);
LTE;
Bearer-independent circuit-switched core network;
Stage 2
(3GPP TS 23.205 version 15.0.0 Release 15)
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3GPP TS 23.205 version 15.0.0 Release 15 1 ETSI TS 123 205 V15.0.0 (2018-09)
Reference
RTS/TSGC-0423205vf00
Keywords
GSM,LTE, UMTS
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All rights reserved.
TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.
TM TM
3GPP and LTE are trademarks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
oneM2M logo is protected for the benefit of its Members.
GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI
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3GPP TS 23.205 version 15.0.0 Release 15 2 ETSI TS 123 205 V15.0.0 (2018-09)
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 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
.
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.
ETSI
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3GPP TS 23.205 version 15.0.0 Release 15 3 ETSI TS 123 205 V15.0.0 (2018-09)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 15
1 Scope . 16
2 References . 16
3 Symbols and abbreviations . 18
3.1 Symbols . 18
3.2 Abbreviations . 18
3.3 Definitions . 19
4 Main Concepts . 19
4.1 General . 19
4.2 Bearer-Independent Call Control . 19
4.3 H.248/MEGACO . 20
5 General Circuit Switched Core Network Domain Architecture . 20
5.1 Logical Architecture . 20
5.1.1 CS Core Network Nodes . 20
5.1.1.1 MSC Server . 20
5.1.1.2 GMSC Server . 20
5.1.1.3 Media Gateway . 20
5.1.2 CS Core Network Interfaces and Reference Points . 21
5.1.2.1 Mc Interface . 21
5.1.2.2 Nc Interface . 21
5.1.2.3 Nb Interface. 21
5.2 Network Interworking . 21
5.2.1 Interworking on the Nc Reference Point . 21
5.2.2 Interworking on the Nb Reference Point . 21
6 Call Establishment . 21
6.1 Basic Mobile Originating Call. 21
6.1.1 Forward bearer establishment . 21
6.1.1.1 MGW selection . 21
6.1.1.2 Initial addressing . 22
6.1.1.3 Network side bearer establishment . 22
6.1.1.4 Access bearer assignment . 22
6.1.1.5 Framing protocol initialisation . 22
6.1.1.6 Confirmation of bearer establishment . 22
6.1.1.7 Through-Connection . 23
6.1.1.8 Interworking function. 23
6.1.1.9 Codec handling . 23
6.1.1.10 Voice Processing function . 23
6.1.1.11 Failure handling in MSC server . 23
6.1.1.12 Example . 23
6.1.2 Backward bearer establishment . 26
6.1.2.1 MGW selection . 26
6.1.2.2 Network side bearer establishment . 26
6.1.2.3 Initial addressing . 26
6.1.2.4 Access bearer assignment . 27
6.1.2.5 Framing protocol initialisation . 27
6.1.2.6 Confirmation of bearer establishment . 27
6.1.2.7 Through-Connection . 27
6.1.2.8 Interworking function. 27
ETSI
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3GPP TS 23.205 version 15.0.0 Release 15 4 ETSI TS 123 205 V15.0.0 (2018-09)
6.1.2.9 Codec handling . 28
6.1.2.10 Voice Processing function . 28
6.1.2.11 Failure handling in MSC server . 28
6.1.2.12 Example . 28
6.1.3 Originating Call Establishment For Iu Interface on IP . 30
6.1.4 Forward bearer establishment with Trace Session Activation . 31
6.1.4.1 Trace activation . 31
6.1.4.2 Example . 32
6.1.5 Originating Call Establishment for A interface over IP . 34
6.2 Basic Mobile Terminating Call . 35
6.2.1 Forward bearer establishment . 35
6.2.1.1 GMSC server. 35
6.2.1.1.1 MGW selection . 35
6.2.1.1.2 Initial addressing . 36
6.2.1.1.3 Outgoing side bearer establishment . 36
6.2.1.1.4 Incoming side bearer establishment. 36
6.2.1.1.5 Framing protocol initialisation . 36
6.2.1.1.6 Through-Connection . 36
6.2.1.1.7 Confirmation of bearer establishment . 36
6.2.1.1.8 Voice Processing function . 37
6.2.1.1.9 Failure handling in GMSC server . 37
6.2.1.2 MSC server . 37
6.2.1.2.1 Paging . 37
6.2.1.2.2 Call setup . 37
6.2.1.2.3 MGW selection . 37
6.2.1.2.4 Network side bearer establishment . 37
6.2.1.2.5 Access bearer assignment . 37
6.2.1.2.6 Framing protocol initialisation . 38
6.2.1.2.7 Called party alerting . 38
6.2.1.2.8 Called party answer . 38
6.2.1.2.9 Through-Connection . 38
6.2.1.2.10 Interworking function . 39
6.2.1.2.11 Codec handling . 39
6.2.1.2.12 Voice Processing function . 39
6.2.1.2.13 Failure handling in MSC server . 39
6.2.1.2.14 Example . 39
6.2.2 Backward bearer establishment . 42
6.2.2.1 GMSC server. 42
6.2.2.1.1 MGW selection . 42
6.2.2.1.2 Outgoing side bearer establishment . 42
6.2.2.1.3 Initial addressing . 42
6.2.2.1.4 Incoming side bearer establishment. 42
6.2.2.1.5 Framing protocol initialisation . 42
6.2.2.1.6 Through-Connection . 43
6.2.2.1.7 Confirmation of bearer establishment . 43
6.2.2.1.8 Voice Processing function . 43
6.2.2.1.9 Failure handling in GMSC server . 43
6.2.2.2 MSC server . 43
6.2.2.2.1 Paging . 43
6.2.2.2.2 Call setup . 43
6.2.2.2.3 MGW selection . 44
6.2.2.2.3 Network side bearer establishment . 44
6.2.2.2.4 Access bearer assignment . 44
6.2.2.2.5 Framing protocol initialisation . 44
6.2.2.2.6 Called party alerting . 45
6.2.2.2.7 Called party answer . 45
6.2.2.2.8 Through-Connection . 45
6.2.2.2.9 Interworking function . 45
6.2.2.2.10 Codec handling . 45
6.2.2.2.11 Voice Processing function . 45
6.2.2.2.12 Failure handling in MSC server . 45
6.2.2.2.13 Example . 45
ETSI
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3GPP TS 23.205 version 15.0.0 Release 15 5 ETSI TS 123 205 V15.0.0 (2018-09)
6.2.3 Terminating Call Establishment For Iu Interface on IP . 49
6.2.4 Terminating Call Establishment For A Interface over IP . 51
7 Call Clearing . 51
7.1 Network Initiated . 52
7.1.1 GMSC server . 52
7.1.1.1 Call clearing from the incoming side . 52
7.1.1.2 Call clearing to the outgoing side . 52
7.1.2 MSC server . 52
7.1.2.1 Call clearing from the network side . 52
7.1.2.2 Call clearing to the UE . 52
7.1.2.3 Example . 53
7.2 User Initiated . 54
7.2.1 Void . 55
7.2.2 MSC server . 55
7.2.2.1 all clearing from the UE . 55
7.2.2.2 Call clearing to the network side . 55
7.2.2.3 Example . 55
7.3 (G)MSC server Initiated . 56
7.3.1 GMSC server . 56
7.3.1.1 Call clearing to the destination side . 56
7.3.1.2 Call clearing to the originating side . 56
7.3.2 MSC server . 57
7.3.2.1 Call clearing to the UE . 57
7.3.2.2 Call clearing to the network side . 57
7.3.2.3 Example . 57
7.4 MGW Initiated . 59
7.4.1 GMSC server . 59
7.4.1.1 Bearer released on the destination side . 59
7.4.1.2 Bearer released on the originating side . 59
7.4.2 MSC server . 59
7.4.2.1 Bearer released on the access side . 59
7.4.2.2 Bearer released on the network side . 59
7.4.2.3 Example . 59
7.5 Call Clearing for Iu Interface on IP . 61
8 Handover/Relocation . 63
8.1 UMTS to UMTS . 63
8.1.1 Intra-MSC SRNS/SBSS Relocation . 63
8.1.1.1 Relocation Required . 64
8.1.1.2 Relocation Command/Relocation Detect . 64
8.1.1.3 Relocation Complete . 64
8.1.1.4 Interworking function. 64
8.1.1.5 Codec handling . 64
8.1.1.6 Voice Processing function . 64
8.1.1.7 Handling of multiple bearers (multicall) . 64
8.1.1.8 Failure Handling
...