SIST EN 300 646-1 V4.2.2:2005

Integrated Services Digital Network (ISDN); Signalling System No.7 (SS7); Digital cellular telecommunications system (Phase 2); Application of ISDN User Part (ISUP) version 2 for the ISDN-Public Land Mobile Network (PLMN) signalling interface; Part 1: Protocol specification (GSM 09.12 version 4.2.2)

Amend ETS 300 646-1 (GSM 09.12) to take account of the results from voting (V9717), and Change Requests; - CR 09.12 v.4.1.0 A001 - CR 09.12 v.4.1.0 A003 Supporting ETSI Members: Vodafone Ltd, Marconi Communications Ltd, Lucent Technologies and Cable & Wireless Communications Ltd.

Digitalno omrežje z integriranimi storitvami (ISDN) - Signalizacija št. 7 (SS7) - Digitalni celični telekomunikacijski sistem (faza 2) - Aplikacija druge različice ISDN-uporabniškega dela (ISUP) za signalizacijski vmesnik ISDN - javno kopensko mobilno omrežje (PLMN) - 1. del: Specifikacija protokola (GSM 09.12, različica 4.2.2)

General Information

• Status: Published
• Publication Date: 31-Mar-2005
• ICS: 33.080 - Integrated Services Digital Network (ISDN)
• Technical Committee: SPN - Services and Protocols for Networks
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Apr-2005
• Due Date: 01-Apr-2005
• Completion Date: 01-Apr-2005
• Ref Project: ETSI EN 300 646-1 V4.2.2 (1999-05) - Integrated Services Digital Network (ISDN); Signalling System No.7 (SS7); Digital cellular telecommunications system (Phase 2); Application of ISDN User Part (ISUP) version 2 for the ISDN-Public Land Mobile Network (PLMN) signalling interface; Part 1: Protocol specification (GSM 09.12 version 4.2.2)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 300 646-1 V4.2.2:2005
01-april-2005
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'LJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHPID]D$SOLNDFLMDGUXJHUD]OLþLFH,6'1
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PRELOQRRPUHåMH3/01GHO6SHFLILNDFLMDSURWRNROD*60UD]OLþLFD

Integrated Services Digital Network (ISDN); Signalling System No.7 (SS7); Digital
cellular telecommunications system (Phase 2); Application of ISDN User Part (ISUP)
version 2 for the ISDN-Public Land Mobile Network (PLMN) signalling interface; Part 1:
Protocol specification (GSM 09.12 version 4.2.2)
Ta slovenski standard je istoveten z: EN 300 646-1 Version 4.2.2
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST EN 300 646-1 V4.2.2:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 300 646-1 V4.2.2:2005

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SIST EN 300 646-1 V4.2.2:2005
EN 300 646-1 V4.2.2 (1999-05)
European Standard (Telecommunications series)
Integrated Services Digital Network (ISDN);
Signalling System No.7;
Digital cellular telecommunications system (Phase 2);
Application of ISDN User Part (ISUP) version 2 for the
ISDN-Public Land Mobile Network (PLMN) signalling interface;
Part 1: Protocol specification
(GSM 09.12 version 4.2.2)
R
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS

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SIST EN 300 646-1 V4.2.2:2005
GSM 09.12 version 4.2.2 2 ETSI EN 300 646-1 V4.2.2 (1999-05)
Reference
REN/SPS-01070 (5zc920pc.PDF)
Keywords
ISDN, SS7, ISUP, GSM, mobile, radio, PLMN,
interworking, DSC
ETSI
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comment to: [e-mail]
Copyright Notification
No part may be reproduced except as authorized by written permission.
The copyright and the foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1999.
All rights reserved.
ETSI

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SIST EN 300 646-1 V4.2.2:2005
GSM 09.12 version 4.2.2 3 ETSI EN 300 646-1 V4.2.2 (1999-05)
Contents
Intellectual Property Rights . 5
Foreword. 5
1 Scope. 6
2 References . 7
3 Definitions and abbreviations. 9
3.1 Definitions . 9
3.2 Abbreviations. 10
4 General principles. 10
5 Exceptions and clarifications for basic call. 11
5.1 Formats and codes . 11
5.2 Basic call signalling procedures. 11
5.2.1 Signalling procedures for connection type allowing fallback. 11
5.2.2 Echo control procedure . 11
5.2.3 Calls from the PLMN to the fixed network . 11
5.2.3.1 Gateway in the PLMN . 11
5.2.3.1.1 Initial address message. 11
5.2.4 Calls from the fixed network to the PLMN . 12
5.2.4.1 Gateway in the fixed network . 12
5.2.4.1.1 Initial address message. 12
5.2.4.2 Gateway in the PLMN . 12
5.2.4.2.1 Address complete message . 12
6 Exceptions and clarifications for supplementary services. 13
6.1 Considerations on ISDN supplementary services . 13
6.1.1 Handling of number parameters related to supplementary services . 13
6.1.1.1 Calling Line Identification Presentation/Restriction (CLIP/CLIR) supplementary services. 13
6.1.1.2 Connected Line Identification Presentation/Restriction (COLP/COLR) supplementary services . 13
6.1.1.3 Terminal Portability (TP) supplementary service. 14
6.1.1.4 User-to-User Signalling (UUS) supplementary service . 14
6.1.1.5 Closed User Group (CUG) supplementary service. 14
6.1.1.6 Subaddressing (SUB) supplementary service . 14
6.1.1.7 Malicious Call Identification (MCID) supplementary service. 14
6.1.1.8 Conference call, add-on (CONF) supplementary service .14
6.1.1.9 Explicit Call Transfer (ECT) supplementary service. 14
6.1.1.10 Diversion supplementary services (Call Forwarding Unconditional (CFU)/Call Forwarding on
Busy (CFB)/Call Forwarding on No Reply (CFNR)/Call Deflection (CD)). 15
6.1.1.11 Call Hold (HOLD) supplementary service . 15
6.1.1.12 Call Waiting (CW) supplementary service . 15
6.1.1.13 Completion of Calls to Busy Subscriber (CCBS) supplementary service. 15
6.1.1.14 Three party (3PTY) supplementary service. 15
6.2 Considerations on GSM unique supplementary services . 15
6.2.1 Call Forwarding on Mobile Subscriber Not Reachable (CFNRc) supplementary service. 15
6.2.2 Advice of Charge (AoC) supplementary service. 15
6.2.3 Call Barring (CB) supplementary service . 16
6.2.4 Unstructured Supplementary Service Data (USSD). 16
ETSI

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SIST EN 300 646-1 V4.2.2:2005
GSM 09.12 version 4.2.2 4 ETSI EN 300 646-1 V4.2.2 (1999-05)
7 Message Transfer Part (MTP) protocol requirements. 16
Annex A (informative): Considerations on teleservices . 17
A.1 Relation between ISDN teleservices and GSM teleservices . 17
Annex B (informative): Considerations on bearer services. 18
Annex C (informative): Mapping of parameters between ISUP and MAP . 19
C.1 Mapping of parameters from IAM to MAP_SEND_ROUTING_INFORMATION req. 19
C.2 Mapping of parameters from MAP_SEND_ROUTING_INFORMATION rsp. to IAM. 19
Annex D (normative): Formats and codes . 20
D.1 Exceptions to table 4 of ITU-T Recommendation Q.763 as modified by ETS 300 356-1. 20
D.2 Exceptions to table 5 of ITU-T Recommendation Q.763 as modified by ETS 300 356-1. 20
D.3 Exceptions and clarifications to clause 3 of ITU-T Recommendation Q.763 as modified by
ETS 300 356-1. 20
Annex E (informative): Examples of echo control procedures. 22
E.1 Outgoing call in a Mobile-service Switching Centre (MSC) . 22
E.2 Incoming call in the MSC. 22
E.3 Examples of echo control procedure . 23
E.3.1 Call from a mobile station to a mobile station via the fixed network. 23
E.3.2 Call from a mobile station to fixed network with no echo control device. 23
E.3.3 Call from a mobile station to fixed network with echo control device. 24
E.3.4 Call from fixed network with no echo control device to a mobile station roaming in a PLMN of another
country . 24
E.3.5 Call from fixed network with echo control device to a mobile station roaming in a PLMN of another
country . 24
E.3.6 Call from fixed network with no echo control device to a mobile station. 25
E.3.7 Call from fixed network with echo control device to a mobile station. 25
E.3.8 Call forwarded by the VMSC . 25
E.3.9 Call forwarded by the VMSC to the fixed network with no echo control device. 25
E.3.10 Call with no outgoing echo control device included in a preceding exchange forwarded by the VMSC to
the fixed network with no echo control device in the terminating network. The VMSC knows that an
outgoing half echo control device is not necessary. 26
E.3.11 Call with no outgoing echo control device included in a preceding exchange forwarded by the VMSC to
the fixed network with echo control device in the terminating network. The VMSC knows that an
outgoing half echo control device is not necessary. 26
E.3.12 Call with no outgoing echo control device included in a preceding exchange forwarded by the VMSC to
the fixed network with no echo control device in the terminating network. The VMSC knows that an
outgoing half echo control device is necessary. 26
E.3.13 Call with no outgoing echo control device included in a preceding exchange forwarded by the VMSC to
the fixed network with echo control device in the terminating network. The VMSC knows that an
outgoing half echo control device is necessary. 27
History. 28
ETSI

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SIST EN 300 646-1 V4.2.2:2005
GSM 09.12 version 4.2.2 5 ETSI EN 300 646-1 V4.2.2 (1999-05)
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 SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect
of ETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on the
ETSI Web server (http://www.etsi.org/ipr).
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 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 European Standard (Telecommunications series) has been produced by ETSI Technical Committees Signalling
Protocols and Switching (SPS) and the Special Mobile Group (SMG).
The present document is part 1 of a multi-part standard covering Signalling System No.7; Digital cellular
telecommunications system (Phase 2); Application of ISDN User Part (ISUP) version 2 for the ISDN-Public Land
Mobile Network (PLMN) signalling interface as described below:
Part 1: "Protocol specification";
Part 2: "Protocol Implementation Conformance Statement (PICS) proforma specification";
Part 3: "Test Suite Structure and Test Purposes (TSS&TP) specification";
Part 4: "Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT)
proforma specification".
The present document corresponds to GSM Technical Specification (GSM-TS) GSM 09.12 version 4.2.2.
ETS 300 303 (1994) covers the application of ISUP version 1 for the ISDN-PLMN interface.
National transposition dates
Date of adoption of this EN: 30 April 1999
Date of latest announcement of this EN (doa): 31 July 1999
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 January 2000
Date of withdrawal of any conflicting National Standard (dow): 31 January 2000
ETSI

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SIST EN 300 646-1 V4.2.2:2005
GSM 09.12 version 4.2.2 6 ETSI EN 300 646-1 V4.2.2 (1999-05)
1 Scope
The present document specifies the second version of the Integrated Services Digital Network (ISDN) - Global System
for Mobile communications (GSM) Public Land Mobile Network (PLMN) signalling interface. The present document is
applicable to the interconnection of PLMN and ISDN.
The ISUP interface defined is the trunk signalling interface between the PLMN and the ISDN. It is assumed that the
interface between PLMN and ISDN can occur at any point in a national network, provided that the exchange in the
national network has this ISDN-PLMN signalling interface.
This signalling interface is based on ISUP version 2 (as given in ETS 300 356-1 to ETS 300 356-19 ([1] to [18])). The
functionality in the GSM system is based on GSM Phase 2.
NOTE 1: Support of new functionality in the GSM system applicable for this interface may be included in the
present document as amendments or be published as a new EN.
Connection types:
The following ISUP version 2 connection types can be supported:
- speech;
- 3,1 kHz audio;
- 64 kbit/s unrestricted;
- 64 kbit/s unrestricted preferred;
-2 · 64 kbit/s unrestricted;
- 384 kbit/s unrestricted;
- 1 536 kbit/s unrestricted;
- 1 920 kbit/s unrestricted.
NOTE 2: 2 · 64 kbit/s, 384 kbit/s, 1 536 kbit/s, 1 920 kbit/s unrestricted and 64 kbit/s unrestricted preferred
connection types are not supported by the GSM access, however the connection types may be used in
order to support other access methods via the GSM network.
Supplementary services:
The following ISUP version 2 supplementary services can be supported:
- Calling Line Identification Presentation (CLIP)/Calling Line Identification Restriction (CLIR);
- Connected Line Identification Presentation (COLP)/Connected Line Identification Restriction (COLR);
- Terminal portability (TP);
- User-to-User Signalling (UUS);
- Closed User Group (CUG);
- Subaddressing (SUB);
- Malicious Call Identification (MCID);
- Conference call, add-on (CONF);
- Explicit Call Transfer (ECT);
- Call Forwarding Unconditional (CFU)/Call Forwarding on Busy (CFB)/Call Forwarding on No Reply (CFNR);
- Call Deflection (CD);
ETSI

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SIST EN 300 646-1 V4.2.2:2005
GSM 09.12 version 4.2.2 7 ETSI EN 300 646-1 V4.2.2 (1999-05)
- Call Hold (HOLD);
- Call Waiting (CW);
- Completion of Calls to Busy Subscriber (CCBS);
- Three party (3PTY).
The support of supplementary services on this interface does not necessarily imply that the supplementary services are
supported in one or the other of the networks interconnected.
The Direct Dialling In (DDI) supplementary service and Multiple Subscriber Number (MSN) supplementary service
have no impact on this interface.
This interface can be used within national networks, however messages and parameters that are marked for national use
(@) in ETS 300 356-1 [1] are not described in the present document.
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, edition number, version number, etc.) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies.
• A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the same
number.
[1] ETS 300 356-1 (1995): "Integrated Services Digital Network (ISDN); Signalling System No.7;
ISDN User Part (ISUP) version 2 for the international interface; Part 1: Basic services [ITU-T
Recommendations Q.761 to Q.764 (1993), modified]".
[2] ETS 300 356-2 (1995): "Integrated Services Digital Network (ISDN); Signalling System No.7;
ISDN User Part (ISUP) version 2 for the international interface; Part 2: ISDN supplementary
services [ITU-T Recommendation Q.730 (1993), modified]".
[3] ETS 300 356-3 (1995): "Integrated Services Digital Network (ISDN); Signalling System No.7;
ISDN User Part (ISUP) version 2 for the international interface; Part 3: Calling Line Identification
Presentation (CLIP) supplementary service [ITU-T Recommendation Q.731, clause 3 (1993),
modified]".
[4] ETS 300 356-4 (1995): "Integrated Services Digital Network (ISDN); Signalling System No.7;
ISDN User Part (ISUP) version 2 for the international interface; Part 4: Calling Line Identification
Restriction (CLIR) supplementary service [ITU-T Recommendation Q.731, clause 4 (1993),
modified]".
[5] ETS 300 356-5 (1995): "Integrated Services Digital Network (ISDN); Signalling System No.7;
ISDN User Part (ISUP) version 2 for the international interface; Part 5: Connected Line
Identification Presentation (COLP) supplementary service [ITU-T Recommendation Q.731,
clause 5 (1993), modified]".
[6] ETS 300 356-6 (1995): "Integrated Services Digital Network (ISDN); Signalling System No.7;
ISDN User Part (ISUP) version 2 for the international interface; Part 6: Connected Line
Identification Restriction (COLR) supplementary service [ITU-T Recommendation Q.731,
clause 6 (1993), modified]".
ETSI

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SIST EN 300 646-1 V4.2.2:2005
GSM 09.12 version 4.2.2 8 ETSI EN 300 646-1 V4.2.2 (1999-05)
[7] ETS 300 356-7 (1995): "Integrated Services Digital Network (ISDN); Signalling System No.7;
ISDN User Part (ISUP) version 2 for the international interface; Part 7: Terminal Portability (TP)
supplementary service [ITU-T Recommendation Q.733, clause 4 (1993), modified]".
[8] ETS 300 356-8 (1995): "Integrated Services Digital Network (ISDN); Signalling System No.7;
ISDN User Part (ISUP) version 2 for the international interface; Part 8: User-to-User Signalling
(UUS) supplementary service [ITU-T Recommendation Q.737, clause 1 (1993), modified]".
[9] ETS 300 356-9 (1995): "Integrated Services Digital Network (ISDN); Signalling System No.7;
ISDN User Part (ISUP) version 2 for the international interface; Part 9: Closed User Group (CUG)
supplementary service [ITU-T Recommendation Q.735, clause 1 (1993), modified]".
[10] ETS 300 356-10 (1995): "Integrated Services Digital Network (ISDN); Signalling System No.7;
ISDN User Part (ISUP) version 2 for the international interface; Part 10: Subaddressing (SUB)
supplementary service [ITU-T Recommendation Q.731, section 8 (1992), modified]".
[11] ETS 300 356-11 (1995): "Integrated Services Digital Network (ISDN); Signalling System No.7;
ISDN User Part (ISUP) version 2 for the international interface; Part 11: Malicious Call
Identification (MCID) supplementary service".
[12] ETS 300 356-12 (1995): "Integrated Services Digital Network (ISDN); Signalling System No.7;
ISDN User Part (ISUP) version 2 for the international interface; Part 12: Conference call, add-on
(CONF) supplementary service [ITU-T Recommendation Q.734, clause 1 (1993), modified]".
[13] ETS 300 356-14 (1995): "Integrated Services Digital Network (ISDN); Signalling System No.7;
ISDN User Part (ISUP) version 2 for the international interface; Part 14: Explicit Call Transfer
(ECT) supplementary service".
[14] ETS 300 356-15 (1995): "Integrated Services Digital Network (ISDN); Signalling System No.7;
ISDN User Part (ISUP) version 2 for the international interface; Part 15: Diversion supplementary
services [ITU-T Recommendation Q.732, clauses 2 to 5 (1993), modified]".
[15] ETS 300 356-16 (1995): "Integrated Services Digital Network (ISDN); Signalling System No.7;
ISDN User Part (ISUP) version 2 for the international interface; Part 16: Call Hold (HOLD)
supplementary service [ITU-T Recommendation Q.733, clause 2 (1993), modified]".
[16] ETS 300 356-17 (1995): "Integrated Services Digital Network (ISDN); Signalling System No.7;
ISDN User Part (ISUP) version 2 for the international interface; Part 17: Call Waiting (CW)
supplementary service [ITU-T Recommendation Q.733, section 1 (1992), modified]".
[17] ETS 300 356-18 (1995): "Integrated Services Digital Network (ISDN); Signalling System No.7;
ISDN User Part (ISUP) version 2 for the international interface; Part 18: Completion of Calls to
Busy Subscriber (CCBS) supplementary service".
[18] ETS 300 356-19 (1995): "Integrated Services Digital Network (ISDN); Signalling System No.7;
ISDN User Part (ISUP) version 2 for the international interface; Part 19: Three party (3PTY)
supplementary service [ITU-T Recommendation Q.734, clause 2 (1993), modified]".
[19] ETS 300 121 (1992): "Integrated Services Digital Network (ISDN); Application of the ISDN User
Part (ISUP) of CCITT Signalling System No.7 for international ISDN interconnections (ISUP
version 1)".
[20] ETS 300 008 (1991): "Integrated Services Digital Network (ISDN); Signalling System No.7;
Message Transfer Part (MTP) to support international interconnection".
[21] ETS 300 540: "Digital cellular telecommunications system (Phase 2); Transmission planning
aspects of the speech service in the GSM Public Land Mobile Network (PLMN) system
(GSM 03.50)".
[22] ITU-T Recommendation Q.763 (1993): "Formats and codes of the ISDN User Part of Signalling
System No. 7".
[23] ETS 300 542: "Digital cellular telecommunications system (Phase 2); Line identification
supplementary services - Stage 2 (GSM 03.81)".
ETSI

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SIST EN 300 646-1 V4.2.2:2005
GSM 09.12 version 4.2.2 9 ETSI EN 300 646-1 V4.2.2 (1999-05)
[24] ETS 300 543: "Digital cellular telecommunications system (Phase 2); Call Forwarding (CF)
supplementary services - Stage 2 (GSM 03.82)".
[25] ETS 300 544: "European digital cellular telecommunications system (Phase 2); Call Waiting (CW)
and Call Hold (HOLD) supplementary services - Stage 2 (GSM 03.83)".
[26] ETS 300 545: "European digital cellular telecommunications system (Phase 2); MultiParty
(MPTY) supplementary services - Stage 2 (GSM 03.84)".
[27] ETS 300 546: "Digital cellular telecommunications system (Phase 2); Closed User Group (CUG)
supplementary services - Stage 2 (GSM 03.85)".
[28] ETS 300 547: "European digital cellular telecommunications system (Phase 2); Advice of Charge
(AoC) supplementary services - Stage 2 (GSM 03.86)".
[29] ETS 300 548: "European digital cellular telecommunications system (Phase 2); Call Barring (CB)
supplementary services - Stage 2 (GSM 03.88)".
[30] ETS 300 549: "Digital cellular telecommunications system (Phase 2); Unstructured Supplementary
Service Data (USSD) - Stage 2 (GSM 03.90)".
[31] ETS 300 601: "European digital cellular telecommunications system (Phase 2); Interworking
between the Public Land Mobile Network (PLMN) and the Circuit Switched Public Data Network
(CSPDN) (GSM 09.04)".
[32] ETS 300 602: "European digital cellular telecommunications system (Phase 2); Interworking
between a Public Land Mobile Network (PLMN) and a Packet Switched Public Data Network
(PSPDN) for Packet Assembly/Disassembly facility (PAD) access (GSM 09.05)".
[33] ETS 300 603: "European digital cellular telecommunications system (Phase 2); Interworking
between the Public Land Mobile Network (PLMN) and the Packet Switched Public Data
Network/Integrated Services Digital Network (PSPDN/ISDN) for the support of packet switched
data transmission services (GSM 09.06)".
[34] ETS 300 604: "Digital cellular telecommunications system (Phase 2); General requirements on
interworking between the Public Land Mobile Network (PLMN) and the Integrated Services
Digital Network (ISDN) or Public Switched Telephone Network (PSTN) (GSM 09.07)".
[35] ETS 300 599: "Digital cellular telecommunications system (Phase 2); Mobile Application Part
(MAP) specification (GSM 09.02)".
[36] ETS 300 303 (1994): "Integrated Services Digital Network (ISDN); ISDN - Global System for
Mobile communications (GSM) Public Land Mobile Network (PLMN) signalling interface".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
gateway: exchange which switches the call to or from another network
Gateway Mobile-service Switching Centre (GMSC): GMSC is an exchange with the functional entity which performs
interrogation to the Home Location Register (HLR)
international gateway: exchange (at the end of an international circuit) which switches a call destined to or originating
from another country
Public Land Mobile Network (PLMN): PLMN is in the present document referring to the GSM network
ETSI

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SIST EN 300 646-1 V4.2.2:2005
GSM 09.12 version 4.2.2 10 ETSI EN 300 646-1 V4.2.2 (1999-05)
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
3PTY Three-Party
ACM Address Complete Message
AoC Advice of Charge
CB Call Barring
CCBS Completion of Calls to Busy Subscriber
CD Call Deflection
CFB Call Forwarding on Busy
CFNR Call Forwarding on No Reply
CFNRc Call Forwarding on Mobile Subscriber Not Reachable
CFU Call Forwarding Unconditional
CLIP Calling Line Identification Presentation
CLIR Calling Line Identification Restriction
COLP Connected Line Identification Presentation
COLR Connected Line Identification Restriction
CONF Conference call
CPG Call Progress message
CUG Closed User Group
CW Call Waiting
DDI Direct Dialling In
ECT Explicit Call Transfer
GMSC Gateway Mobile-service Switching Centre
GSM Glob
...