SIST-V ETSI/EG 201 817 V1.1.1:2003

• Abstract:

  To study the possibility of introduction of a separate document containing service interactions between all ISDN supplementary services. With the current approach, where the interactions are described in the standard of each supplementary service concerned, it is hard to keep track of where the latest version of the text is located. This trial document will contain the same set of approved supplementary services as the latest draft of the respective stage 3 interaction document. For this trial period the current approach will kept in parallel, i.e. for the supplemantary services currently under work, the interactions are described in the standard of each supplemenatry service. Reference document: EN 300 195-1 V1.4.1/1998-06.

• Status: Published
• Publication Date: 31-Oct-2003
• 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-Nov-2003
• Due Date: 01-Nov-2003
• Completion Date: 01-Nov-2003
• Ref Project: ETSI EG 201 817 V1.1.1 (2000-09) - Integrated Services Digital Network (ISDN); Supplementary service interactions

SIST-V ETSI/EG 201 817 V1.1.1:2003 is the Slovenian version of ETSI EG 201 817 V1.1.1, an ETSI Guide produced by ETSI Technical Committee Services and Protocols for Advanced Networks (SPAN). It gives stage one guidance on interactions between Integrated Services Digital Network (ISDN) supplementary services, so operators, implementers, and test teams can see how the services behave when used together. The document is presented as a trial consolidation of those interactions while service-specific standards continue in parallel.

What does SIST-V ETSI/EG 201 817 V1.1.1:2003 specify?

SIST-V ETSI/EG 201 817 V1.1.1:2003 specifies the interaction guidance for a wide set of ISDN supplementary services in pan-European public networks. Its purpose is to gather interaction text in one place, because the same material was previously spread across individual service standards.

The document is organized as a short front section and one long interaction clause, with definitions and references supporting the technical terms used throughout. Clause 4 is the core of the document: it lists pairs of supplementary services and states whether the interaction is not applicable, has no impact, or needs a detailed description.

Annex	What it covers
Annex A (informative)	Interaction between the UUS supplementary service and the CD (after alerting) and the CFNR supplementary services

What are the key requirements of SIST-V ETSI/EG 201 817 V1.1.1:2003?

The main technical content is the pairwise interaction behavior between supplementary services. In practice, the document tells a network designer or service provider what to do when two services are both present on the same call or subscription.

• Clause 4 uses a matrix to map every service pair to either NA (Not Applicable), NI (No Impact), or a detailed interaction clause. This matters because it lets implementers quickly see which combinations need specific handling in the network.
• Clause 4.9 sets the interaction between CCNR and CCBS. If a CCNR request can be processed, the network gives the user a CCNR recall or notification as defined in EN 301 134, cancels the destination B idle guard timer, and handles CCBS requests according to the CCBS service. For network design, this means recall queues and timer handling must be coordinated, not treated separately.
• Clause 4.56 to 4.58 explains how AOC-S, AOC-D, and AOC-E interact with CONF. The document distinguishes between a conference started from idle state and one created from an active call, and it also distinguishes adding a call, creating private communication, and terminating the conference. The practical effect is that charging information must follow the conference structure, not just the original call structure.
• Clause 4.176 states that if SCF was activated before OCB-UC, the SCF supplementary service is not affected. For operators, this is a stability rule: activating user-controlled outgoing barring must not unexpectedly change an already active selective call forwarding service.
• Clause 4.201, clause 4.203, and Annex A describe UUS interaction with CD and CFNR. The document distinguishes explicit and implicit UUS requests, and whether the request is required or not required for the call to proceed. This matters because the call may need to be forwarded or deflected together with UUI, or the request may have to be rejected or overridden.
• Clause 4.205 explains CONF with UUS. The conference controller can use UUS between the controller and individual conferees, but UUS is not used for communication between conferees themselves. UUI may be sent individually or broadcast by the conference controller, and the network must identify which conferee sent UUI to the controller.
• Clause 4.86, clause 4.100, clause 4.106, and other self-interaction clauses show how the same supplementary service behaves with itself. These cases are useful for switch logic and service-state handling, because the network needs a defined answer even when both ends invoke the same feature.

What terms does SIST-V ETSI/EG 201 817 V1.1.1:2003 define?

The document defines key service terms so the interaction rules can be read consistently.

• CCNR recall is the indication telling user A that the network is ready to initiate a CCNR call and is waiting for a response.
• Conference controller is the served user who invokes CONF and controls adding and removing conferees.
• Diversion is the general term for forwarding and deflection, where a call is redirected instead of being answered.
• Freephone number is the number assigned under FPH and used together with a service access code to form the national part of an ISDN number.
• No Impact (NI) means one supplementary service does not affect the operation of the other.
• Not Applicable (NA) means the supplementary service has no interaction with itself.
• User-to-User Information (UUI) is information carried by the UUS supplementary service.
• Explicit request and implicit request describe how UUS is requested, either by a direct request or by sending UUI without an explicit activation request.

Who uses SIST-V ETSI/EG 201 817 V1.1.1:2003?

SIST-V ETSI/EG 201 817 V1.1.1:2003 is used by European public telecommunications operators, network operators, and service providers that offer ISDN supplementary services. It is also relevant to engineers who design or maintain switches and signaling behavior, because the document shows how services interact at call setup, during a call, and when a call is forwarded, deflected, or conferenced.

Test laboratories and quality teams use it to check that implementations match the expected behavior for service combinations such as AOC, CCBS, CCNR, CFNR, UUS, and CONF. Buyers and product managers can also use it to confirm that a platform supports the service combinations they need in operational networks.

What changed in SIST-V ETSI/EG 201 817 V1.1.1:2003 from the previous edition?

The document is presented as a trial consolidation of stage one supplementary service interactions. The scope and introduction say that the same interactions continue to exist in the individual supplementary service standards during the trial period, so the approved standards remain in parallel while the interactions are collected in one place.

Which standards are used with SIST-V ETSI/EG 201 817 V1.1.1:2003?

The document relies on service descriptions and related guidance for the individual supplementary services it compares.

• EN 301 134 provides the CCNR service description and is explicitly used for the CCNR recall and timer handling in clause 4.9.
• EN 300 195-1 is named as the reference document in the scope, and the bibliography also cites EN 300 195-1 V1.4.3 as the protocol specification for supplementary service interactions.
• The ETSI service descriptions for CW, CLIP, MMC, CONF, CFB, CFU, CFNR, FPH, CCBS, ECT, CD, UUS, MWI, OCB-F, OCB-UC, SCF, MSN, TP, SUB, DDI, CLIR, COLP, COLR, MCID, CUG, HOLD, AOC-S, AOC-D, AOC-E, and 3PTY provide the behavior that each interaction depends on.
• ITU-T E.164, I.112, I.210, and I.221 provide numbering, vocabulary, and service principles used in the definitions.

What does the SIST-V ETSI/EG 201 817 V1.1.1:2003 document contain?

The document contains one overview figure for the interaction matrix and a long set of pairwise interaction clauses in clause 4. Those clauses are used for service design and implementation because they state what happens when two supplementary services meet on the same call.

It also contains a detailed definitions clause, which is important for reading the interaction text correctly. Annex A adds a small decision table for UUS with CD (after alerting) and CFNR, showing how requests and UUI are forwarded or deflected in different request types.

The bibliography lists the service-description standards that support the interaction rules. For a reader, that means the document is not a full service specification by itself - it is the place to check how ISDN supplementary services interact and which companion standards define the services being combined.

SLOVENSKI STANDARD
01-november-2003
Digitalno omrežje z integriranimi storitvami (ISDN) - Vzajemno vplivanje
dopolnilnih storitev
Integrated Services Digital Network (ISDN) - Supplementary service interactions
Ta slovenski standard je istoveten z: EG 201 817 Version 1.1.1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

ETSI Guide
Integrated Services Digital Network (ISDN);
Supplementary service interactions

2 ETSI EG 201 817 V1.1.1 (2000-09)
Reference
DEG/SPAN-020083
Keywords
ISDN, supplementary service, interaction
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ETSI
3 ETSI EG 201 817 V1.1.1 (2000-09)
Contents
Intellectual Property Rights.8
Foreword.8
Introduction .8
1 Scope .9
2 References .9
3 Definitions and abbreviations.10
3.1 Definitions.10
3.2 Abbreviations .13
4 Description of supplementary service interactions.14
4.1 The AOC-D and AOC-E supplementary services .15
4.2 The AOC-S and CCBS supplementary services.15
4.3 The AOC-D and CCBS supplementary services .15
4.4 The AOC-E and CCBS supplementary services .15
4.5 The CCBS and CCBS supplementary services .15
4.6 The AOC-S and CCNR supplementary services .15
4.7 The AOC-D and CCNR supplementary services .15
4.8 The AOC-E and CCNR supplementary services.15
4.9 The CCBS and CCNR supplementary services.15
4.10 The CCNR and CCNR supplementary services .16
4.11 The AOC-S and CD supplementary services .16
4.12 The AOC-D and CD supplementary services.16
4.13 The AOC-E and CD supplementary services .16
4.14 The CCBS and CD supplementary services .17
4.15 The CCNR and CD supplementary services .17
4.16 The AOC-S and CFB supplementary services .17
4.17 The AOC-D and CFB supplementary services.18
4.18 The AOC-E and CFB supplementary services .18
4.19 The CCBS and CFB supplementary services .18
4.20 The CCNR and CFB supplementary services .19
4.21 The CD and CFB supplementary services.19
4.22 The AOC-S and CFNR supplementary services .19
4.23 The AOC-D and CFNR supplementary services.19
4.24 The AOC-E and CFNR supplementary services .19
4.25 The CCBS and CFNR supplementary services .20
4.26 The CCNR and CFNR supplementary services.20
4.27 The CD and CFNR supplementary services.20
4.28 The AOC-S and CFU supplementary services .21
4.29 The AOC-D and CFU supplementary services .21
4.30 The AOC-E and CFU supplementary services.21
4.31 The CCBS and CFU supplementary services.21
4.32 The CCNR and CFU supplementary services .22
4.33 The CD and CFU supplementary services .22
4.34 The CFB and CFU supplementary services .22
4.35 The CFNR and CFU supplementary services.22
4.36 The CCNR and CLIP supplementary services .22
4.37 The CD and CLIP supplementary services.22
4.38 The CFB and CLIP supplementary services.22
4.39 The CFNR and CLIP supplementary services.23
4.40 The CFU and CLIP supplementary services .23
4.41 The CCNR and CLIR supplementary services.23
4.42 The CD and CLIR supplementary services .23
4.43 The CFB and CLIR supplementary services .23
4.44 The CFNR and CLIR supplementary services .23
ETSI
4 ETSI EG 201 817 V1.1.1 (2000-09)
4.45 The CFU and CLIR supplementary services.23
4.46 The CLIP and CLIR supplementary services .23
4.47 The CD and COLP supplementary services .24
4.48 The CFB and COLP supplementary services .24
4.49 The CFNR and COLP supplementary services .24
4.50 The CFU and COLP supplementary services.24
4.51 The CD and COLR supplementary services.24
4.52 The CFB and COLR supplementary services.25
4.53 The CFNR and COLR supplementary services.25
4.54 The CFU and COLR supplementary services .25
4.55 The COLP and COLR supplementary services .25
4.56 The AOC-S and CONF supplementary services .25
4.57 The AOC-D and CONF supplementary services.26
4.58 The AOC-E and CONF supplementary services .27
4.59 The CCBS and CONF supplementary services .28
4.60 The COLP and CONF supplementary services .28
4.61 The CONF and CONF supplementary services.28
4.62 The CCNR and CUG supplementary services.28
4.63 The CD and CUG supplementary services.29
4.64 The CFB and CUG supplementary services.29
4.65 The CFNR and CUG supplementary services .29
4.66 The CFU and CUG supplementary services.29
4.67 The CONF and CUG supplementary services.29
4.68 The CCBS and CW supplementary services .29
4.69 The CCNR and CW supplementary services.30
4.70 The CD and CW supplementary services.30
4.71 The CFB and CW supplementary services.30
4.72 The CFNR and CW supplementary services.30
4.73 The CFU and CW supplementary services.30
4.74 The CLIP and DDI supplementary services .31
4.75 The COLP and DDI supplementary services.31
4.76 The CUG and DDI supplementary services .31
4.77 The AOC-S and ECT supplementary services .31
4.78 The AOC-D and ECT supplementary services.31
4.79 The AOC-E and ECT supplementary services .32
4.80 The CD and ECT supplementary services.32
4.81 The CFNR and ECT supplementary services.32
4.82 The CLIR and ECT supplementary services .32
4.83 The COLR and ECT supplementary services.32
4.84 The CONF and ECT supplementary services.32
4.85 The CUG and ECT supplementary services.32
4.86 The ECT and ECT supplementary services.33
4.87 The AOC-S and FPH supplementary services.33
4.88 The AOC-D and FPH supplementary services.33
4.89 The AOC-E and FPH supplementary services .33
4.90 The CCBS and FPH supplementary services .33
4.91 The CCNR and FPH supplementary services.33
4.92 The CD and FPH supplementary services.34
4.93 The CFB and FPH supplementary services.34
4.94 The CFNR and FPH supplementary services .34
4.95 The CFU and FPH supplementary services.35
4.96 The CLIR and FPH supplementary services .35
4.97 The COLP and FPH supplementary services .35
4.98 The COLR and FPH supplementary services.35
4.99 The ECT and FPH supplementary services.35
4.100 The FPH and FPH supplementary services .35
4.101 The AOC-D and HOLD supplementary services .36
4.102 The CCNR and HOLD supplementary services.36
4.103 The CONF and HOLD supplementary services .36
4.104 The CW and HOLD supplementary services .36
4.105 The ECT and HOLD supplementary services .36
4.106 The HOLD and HOLD supplementary services.36
ETSI
5 ETSI EG 201 817 V1.1.1 (2000-09)
4.107 The CD and MCID supplementary services.36
4.108 The CFB and MCID supplementary services.37
4.109 The CFNR and MCID supplementary services .37
4.110 The CFU and MCID supplementary services.37
4.111 The CLIR and MCID supplementary services .37
4.112 The CONF and MCID supplementary services.37
4.113 The DDI and MCID supplementary services .37
4.114 The ECT and MCID supplementary services.38
4.115 The FPH and MCID supplementary services .38
4.116 The CCBS and MMC supplementary services.38
4.117 The CCNR and MMC supplementary services .38
4.118 The CONF and MMC supplementary services .38
4.119 The ECT and MMC supplementary services.38
4.120 The HOLD and MMC supplementary services .38
4.121 The CFB and MSN supplementary services.38
4.122 The CFNR and MSN supplementary services.39
4.123 The CFU and MSN supplementary services .39
4.124 The CLIP and MSN supplementary services.39
4.125 The CUG and MSN supplementary services.39
4.126 The DDI and MSN supplementary services .39
4.127 The MCID and MSN supplementary services.39
4.128 The CFB and MWI supplementary services.39
4.129 The CFNR and MWI supplementary services.40
4.130 The CFU and MWI supplementary services .40
4.131 The MSN and MWI supplementary services.40
4.132 The CCBS and OCB-F supplementary services.40
4.133 The CCNR and OCB-F supplementary services .40
4.134 The CD and OCB-F supplementary services.40
4.135 The CFB and OCB-F supplementary services.40
4.136 The CFNR and OCB-F supplementary services.40
4.137 The CFU and OCB-F supplementary services .41
4.138 The CUG and OCB-F supplementary services.41
4.139 The FPH and OCB-F supplementary services.41
4.140 The MSN and OCB-F supplementary services .41
4.141 The CCBS and OCB-UC supplementary services.41
4.142 The CCNR and OCB-UC supplementary services.41
4.143 The CD and OCB-UC supplementary services .41
4.144 The CFB and OCB-UC supplementary services .41
4.145 The CFNR and OCB-UC supplementary services .42
4.146 The CFU and OCB-UC supplementary services .42
4.147 The CUG and OCB-UC supplementary services .42
4.148 The FPH and OCB-UC supplementary services .42
4.149 The MSN and OCB-UC supplementary services .42
4.150 The OCB-F and OCB-UC supplementary services .42
4.151 The AOC-S and SCF supplementary services.42
4.152 The AOC-D and SCF supplementary services .43
4.153 The AOC-E and SCF supplementary services.43
4.154 The CCBS and SCF supplementary services.43
4.155 The CCNR and SCF supplementary services.43
4.156 The CD and SCF supplementary services .43
4.157 The CFB and SCF supplementary services .43
4.158 The CFNR and SCF supplementary services .43
4.159 The CFU and SCF supplementary services.43
4.160 The CLIP and SCF supplementary services .44
4.161 The CLIR and SCF supplementary services.44
4.162 The COLP and SCF supplementary services.44
4.163 The COLR and SCF supplementary services .44
4.164 The CONF and SCF supplementary services .44
4.165 The CUG and SCF supplementary services .44
4.166 The CW and SCF supplementary services .44
4.167 The DDI and SCF supplementary services.44
4.168 The ECT and SCF supplementary services .44
ETSI
6 ETSI EG 201 817 V1.1.1 (2000-09)
4.169 The FPH and SCF supplementary services .45
4.170 The HOLD and SCF supplementary services.45
4.171 The MCID and SCF supplementary services .45
4.172 The MMC and SCF supplementary services.45
4.173 The MSN and SCF supplementary services .45
4.174 The MWI and SCF supplementary services .45
4.175 The OCB-F and SCF supplementary services .45
4.176 The OCB-UC and SCF supplementary services.45
4.177 The SCF and SCF supplementary services.46
4.178 The CCBS and SUB supplementary services.46
4.179 The CCNR and SUB supplementary services .46
4.180 The CD and SUB supplementary services .46
4.181 The CFB and SUB supplementary services .46
4.182 The CFNR and SUB supplementary services.46
4.183 The CFU and SUB supplementary services .46
4.184 The CLIP and SUB supplementary services .46
4.185 The COLP and SUB supplementary services.46
4.186 The MWI and SUB supplementary services .47
4.187 The SCF and SUB supplementary services.47
4.188 The AOC-S and TP supplementary services .47
4.189 The AOC-D and TP supplementary services.47
4.190 The AOC-E and TP supplementary services.47
4.191 The CCBS and TP supplementary services.47
4.192 The CCNR and TP supplementary services .47
4.193 The CONF and TP supplementary services .47
4.194 The CW and TP supplementary services.48
4.195 The HOLD and TP supplementary services .48
4.196 The MCID and TP supplementary services.48
4.197 The SCF and TP supplementary services .48
4.198 The TP and TP supplementary services .48
4.199 The CCBS and UUS supplementary services.48
4.200 The CCNR and UUS supplementary services .48
4.201 The CD and UUS supplementary services .48
4.202 The CFB and UUS supplementary services .49
4.203 The CFNR and UUS supplementary services .50
4.204 The CFU and UUS supplementary services .50
4.205 The CONF and UUS supplementary services .51
4.206 The CW and UUS supplementary services .51
4.207 The ECT and UUS supplementary services .51
4.208 The MMC and UUS supplementary services .51
4.209 The SCF and UUS supplementary services.52
4.210 The TP and UUS supplementary services .52
4.211 The AOC-S and 3PTY supplementary services .52
4.212 The AOC-D and 3PTY supplementary services.52
4.213 The AOC-E and 3PTY supplementary services .52
4.214 The CONF and 3PTY supplementary services.52
4.215 The CUG and 3PTY supplementary services.52
4.216 The CW and 3PTY supplementary services.53
4.217 The ECT and 3PTY supplementary services.53
4.218 The HOLD and 3PTY supplementary services .53
4.219 The MMC and 3PTY supplementary services.53
4.220 The MSN and 3PTY supplementary services.53
4.221 The SCF and 3PTY supplementary services .53
4.222 The TP and 3PTY supplementary services.53
4.223 The UUS and 3PTY supplementary services .54
4.224 The 3PTY and 3PTY supplementary services.54
ETSI
7 ETSI EG 201 817 V1.1.1 (2000-09)
Annex A (informative): Interaction between the UUS supplementary service and the CD
(after alerting) and the CFNR supplementary services.55
Bibliography.56
History .58
ETSI
8 ETSI EG 201 817 V1.1.1 (2000-09)
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://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 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 ETSI Guide (EG) has been produced by ETSI Technical Committee Services and Protocols for Advanced
Networks (SPAN).
Introduction
In the present document the stage one of the ISDN supplementary service interactions have been collected into a single
document. With the current approach of the supplementary service standardization in ETSI, where the interactions are
described in the standards of each supplementary service concerned, it is hard to keep track of where the latest version
of the text is located. This trial document contains the same set of approved supplementary services as the latest version
of the respective stage three interaction document (EN 300 195-1 V1.4.3). For this trial period the current approach will
be kept in parallel, i.e. for the supplementary services currently under work, the interactions are described in the
standards of each supplementary service. Also the approved standards will not be modified by deleting the texts on
interactions.
ETSI
9 ETSI EG 201 817 V1.1.1 (2000-09)
1 Scope
The present document gives guidance on the stage one of the supplementary service interactions for the pan-European
Integrated Services Digital Network (ISDN) as provided by European public telecommunications operators.
The interactions between the Advice of Charge: charging information at call set-up time (AOC-S), Advice of Charge:
charging information during the call (AOC-D), Advice of Charge: charging information at the end of the call (AOC-E),
Completion of Calls to Busy Subscriber (CCBS), Completion of Calls on No Reply (CCNR), Call Deflection (CD), Call
Forwarding Busy (CFB), Call Forwarding No Reply (CFNR), Call Forwarding Unconditional (CFU), Calling Line
Identification Presentation (CLIP), Calling Line Identification Restriction (CLIR), Connected Line Identification
Presentation (COLP), Connected Line Identification Restriction (COLR), Conference call, add-on (CONF), Explicit
Call Transfer (ECT), Closed User Group (CUG), Call Waiting (CW), Direct Dialling In (DDI), Freephone (FPH), Call
Hold (HOLD), Malicious Call Identification (MCID), Multiple Subscriber Number (MSN), Message Waiting Indication
(MWI), Outgoing Call Barring-Fixed (OCB-F), Outgoing Call Barring-User Controlled (OCB-UC), Selective Call
Forwarding (SCF), Subaddressing (SUB), Terminal Portability (TP), User-to-User Signalling (UUS) and Three-Party
(3PTY) supplementary services are covered 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, subsequent revisions do apply.
[1] ETSI ETS 300 056 (1991) including amendment A1 (1996): "Integrated Services Digital Network
(ISDN); Call Waiting (CW) supplementary service; Service description".
[2] ETSI ETS 300 089 (1992): "Integrated Services Digital Network (ISDN); Calling Line
Identification Presentation (CLIP) supplementary service; Service description".
[3] ETSI ETS 300 164 (1992): "Integrated Services Digital Network (ISDN); Meet-Me Conference
(MMC) supplementary service; Service description".
[4] ETSI ETS 300 183 (1992) including amendment A1 (1998): "Integrated Services Digital Network
(ISDN); Conference call, add-on (CONF) supplementary service; Service description".
[5] ETSI ETS 300 199 (1994): "Integrated Services Digital Network (ISDN); Call Forwarding Busy
(CFB) supplementary service; Service description".
[6] ETSI ETS 300 200 (1994): "Integrated Services Digital Network (ISDN); Call Forwarding
Unconditional (CFU) supplementary service; Service description".
[7] ETSI ETS 300 201 (1994) including amendment A1 (1996): "Integrated Services Digital Network
(ISDN); Call Forwarding No Reply (CFNR) supplementary service; Service description".
[8] ETSI ETS 300 208 (1996): "Integrated Services Digital Network (ISDN); Freephone (FPH)
supplementary service; Service description".
[9] ETSI ETS 300 357 (1995): "Integrated Services Digital Network (ISDN); Completion of Calls to
Busy Subscriber (CCBS) supplementary service; Service description".
[10] ETSI ETS 300 367 (1995): "Integrated Services Digital Network (ISDN); Explicit Call Transfer
(ECT) supplementary service; Service description".
[11] ETSI EN 301 134 (V1.1.1): "Integrated Services Digital Network (ISDN); Completion of Calls on
No Reply (CCNR) supplementary service; Service description".
ETSI
10 ETSI EG 201 817 V1.1.1 (2000-09)
[12] ITU-T Recommendation E.164 (1997): "The international public telecommunication numbering
plan".
[13] ITU-T Recommendation I.112 (1993): "Vocabulary of terms for ISDNs".
[14] ITU-T Recommendation I.210 (1993): "Principles of telecommunication services supported by an
ISDN and the means to describe them".
[15] ITU-T Recommendation I.221 (1993): "Common specific characteristics of services".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply.
active call: call on which the connection has already been established
barring program: selection of type of calls to which the calls can be barred
busy: see ITU-T Recommendation I.221 [15], clause 3
call forwarding: general term applied to any functionality whereby a call is redirected automatically by the service
provider to another user. The forms of forwarding are: unconditional, whereby all calls are redirected; busy, whereby
calls encountering busy are redirected; and, no reply, whereby calls which are not answered within a time period are
redirected
called party number: ITU-T Recommendation E.164 [12] number provided by the calling user, when originating the
call in order to identify the called user in the call
calling party number: number provided by the public network which identif
...