SIST ETS 300 544 E1:2003
(Main)European digital cellular telecommunications system (Phase 2); Call Waiting (CW) and Call Hold (HOLD) supplementary services; Stage 2 (GSM 03.83)
European digital cellular telecommunications system (Phase 2); Call Waiting (CW) and Call Hold (HOLD) supplementary services; Stage 2 (GSM 03.83)
....
Evropski digitalni celični telekomunikacijski sistem (faza 2) – Dopolnilna storitev: čakajoči klic (CW) in zadržanje klica (HOLD) – Stopnja 2 (GSM 03.83)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST ETS 300 544 E1:2003
01-december-2003
(YURSVNLGLJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHP ID]D ±'RSROQLOQDVWRULWHY
þDNDMRþLNOLF &: LQ]DGUåDQMHNOLFD +2/' ±6WRSQMD *60
European digital cellular telecommunications system (Phase 2); Call Waiting (CW) and
Call Hold (HOLD) supplementary services; Stage 2 (GSM 03.83)
Ta slovenski standard je istoveten z: ETS 300 544 Edition 1
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST ETS 300 544 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST ETS 300 544 E1:2003
EUROPEAN ETS 300 544
TELECOMMUNICATION March 1995
STANDARD
Source: ETSI TC-SMG Reference: DE/SMG-030383P
ICS: 33.060.30
European digital cellular telecommunications system, Global System for Mobile communications
Key words:
(GSM)
European digital cellular telecommunications system (Phase 2);
Call Waiting (CW) and Call Hold (HOLD)
supplementary services - Stage 2
(GSM 03.83)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - secretariat@etsi.fr
X.400: Internet:
Tel.: +33 92 94 42 00 - Fax: +33 93 65 47 16
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 1995. All rights reserved.
New presentation - see History box
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Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.
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ETS 300 544: March 1995 (GSM 03.83 version 4.4.1)
Contents
Foreword.5
0 General .7
0.1 Scope .7
0.2 Normative references .7
0.3 Definitions and abbreviations.7
1 Call waiting (CW) .8
1.1 Handling of call waiting .8
1.1.1 Activation.8
1.1.2 Deactivation.8
1.1.3 Interrogation .9
1.2 Functions and information flows.10
1.2.1 Description of overall SDL-diagram of call waiting.11
1.2.1.1 Behaviour during the "Pending Ack" state.11
1.2.1.2 Behaviour during the "Waiting" State .12
1.3 Information stored in the HLR.30
1.4 State transition model.30
1.5 Transfer of information from HLR to VLR .31
1.6 Information stored in the VLR.31
1.7 Handover.31
2 Call hold (HOLD).32
2.1 Functions and information flows.32
2.2 Information stored in the HLR.38
2.3 State transition model.38
2.4 Transfer of information from HLR to VLR .39
2.5 Information stored in the VLR.39
2.6 Handover.39
History.40
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ETS 300 544: March 1995 (GSM 03.83 version 4.4.1)
Foreword
This European Telecommunication Standard (ETS) has been produced by the Special Mobile Group
(SMG) Technical Committee (TC) of the European Telecommunications Standards Institute (ETSI).
This ETS defines the stage 2 of the Call Waiting (CW) and Call Hold (HOLD) supplementary services for
the European digital cellular telecommunications system (Phase 2).
This ETS corresponds to GSM Technical Specification (GSM-TS) GSM 03.83 version 4.4.1.
The specification from which this ETS has been derived was originally based on CEPT documentation,
hence the presentation of this ETS may not be entirely in accordance with the ETSI/PNE rules.
Reference is made within this ETS to GSM-TSs (NOTE).
NOTE: TC-SMG has produced documents which give the technical specifications for the
implementation of the European digital cellular telecommunications system. Historically,
these documents have been identified as GSM Technical Specifications (GSM-TSs).
These TSs may have subsequently become I-ETSs (Phase 1), or ETSs (Phase 2),
whilst others may become ETSI Technical Reports (ETRs). GSM-TSs are, for editorial
reasons, still referred to in current GSM ETSs.
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ETS 300 544: March 1995 (GSM 03.83 version 4.4.1)
0 General
0.1 Scope
This specification gives the stage 2 description of the call completion supplementary services.
The group of call completion supplementary services is divided into the following two supplementary
services:
- Call waiting (CW) (section 1);
- Call hold (HOLD) (section 2).
0.2 Normative references
This ETS incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply
to this ETS only when incorporated in it by amendment or revision. For undated references, the latest
edition of the publication referred to applies.
[1] GSM 01.04 (ETR 100): "European digital cellular telecommunications system
(Phase 2); "Abbreviations and acronyms".
[2] GSM 02.82 (ETS 300 515): "European digital cellular telecommunications
system (Phase 2); Call Forwarding (CF) supplementary services - Stage 1".
[3] GSM 03.11 (ETS 300 529): "European digital cellular telecommunications
system (Phase 2); Technical realization of supplementary services".
[4] GSM 04.08 (ETS 300 557): "European digital cellular telecommunications
system (Phase 2); Mobile radio interface layer 3 specification".
0.3 Definitions and abbreviations
Abbreviations used in this specification are listed in GSM 01.04.
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1 Call waiting (CW)
1.1 Handling of call waiting
1.1.1 Activation
The call waiting supplementary service is activated at the request of the user. The activation request
indicates the basic services to which the activation request refers.
The information flow for activation of call waiting is shown in figure 1.1.
MS MSC VLR HLR
�˜˜˜¿ �˜˜˜¿ �˜˜˜¿ �˜˜˜¿
‡ ‡ Activate CW ‡ ‡ ‡ ‡ ‡ ‡
‡ ˆ˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜>‡ ‡ ‡ ‡ ‡ ‡
‡ ‡ ‡ ‡ Activate CW ‡ ‡ ‡ ‡
‡ ‡ ‡ ˆ˜˜˜˜˜˜˜˜˜˜˜˜˜>‡ ‡ ‡ ‡
‡ ‡ ‡ ‡ ‡ ‡ Activate CW ‡ ‡
‡ ‡ ‡ ‡ ‡ ˆ˜˜˜˜˜˜˜˜˜˜˜˜˜>‡ ‡
‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡
‡ ‡ ‡ ‡ ‡ ‡ Acknowledge ‡ ‡
‡ ‡ ‡ ‡ ‡ ‡<˜˜˜˜˜˜˜˜˜˜˜˜˜· ‡
‡ ‡ ‡ ‡ Acknowledge ‡ ‡ ‡ ‡
‡ ‡ ‡ ‡<˜˜˜˜˜˜˜˜˜˜˜˜˜· ‡ ‡ ‡
‡ ‡Release Complete‡ ‡ ‡ ‡ ‡ ‡
‡ ‡<˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜· ‡ ‡ ‡ ‡ ‡
‡ ‡ /Facility ‡ ‡ ‡ ‡ ‡ ‡
‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡
‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡
Figure 1.1: Activation of call waiting
1.1.2 Deactivation
The call waiting supplementary service is deactivated at the request of the user. The deactivation request
indicates the basic services to which the deactivation request refers.
The information flow for deactivation of call waiting is shown in figure 1.2.
MS MSC VLR HLR
�˜˜˜¿ �˜˜˜¿ �˜˜˜¿ �˜˜˜¿
‡ ‡Deactivate CW ‡ ‡ ‡ ‡ ‡ ‡
‡ ˆ˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜>‡ ‡ ‡ ‡ ‡ ‡
‡ ‡ ‡ ‡Deactivate CW ‡ ‡ ‡ ‡
‡ ‡ ‡ ˆ˜˜˜˜˜˜˜˜˜˜˜˜˜>‡ ‡ ‡ ‡
‡ ‡ ‡ ‡ ‡ ‡Deactivate CW ‡ ‡
‡ ‡ ‡ ‡ ‡ ˆ˜˜˜˜˜˜˜˜˜˜˜˜˜>‡ ‡
‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡
‡ ‡ ‡ ‡ ‡ ‡ Acknowledge ‡ ‡
‡ ‡ ‡ ‡ ‡ ‡<˜˜˜˜˜˜˜˜˜˜˜˜˜· ‡
‡ ‡ ‡ ‡ Acknowledge ‡ ‡ ‡ ‡
‡ ‡ ‡ ‡<˜˜˜˜˜˜˜˜˜˜˜˜˜· ‡ ‡ ‡
‡ ‡Release Complete‡ ‡ ‡ ‡ ‡ ‡
‡ ‡<˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜· ‡ ‡ ‡ ‡ ‡
‡ ‡ /Facility ‡ ‡ ‡ ‡ ‡ ‡
‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡
‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡
Figure 1.2: Deactivation of call waiting
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1.1.3 Interrogation
Status check
The status check procedure enables the mobile subscriber to obtain information about the status of the call
waiting supplementary service with respect to subscribed basic service groups.
The interrogation of call waiting is for all applicable basic services.
The information flow for interrogation of call waiting is shown in figure 1.3.
MS MSC VLR HLR
�˜˜˜¿ �˜˜˜¿ �˜˜˜¿ �˜˜˜¿
‡ ‡Interrogate CW ‡ ‡ ‡ ‡ ‡ ‡
‡ ˆ˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜>‡ ‡ ‡ ‡ ‡ ‡
‡ ‡ ‡ ‡Interrogate CW‡ ‡ ‡ ‡
‡ ‡ ‡ ˆ˜˜˜˜˜˜˜˜˜˜˜˜˜>‡ ‡ ‡ ‡
‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡
‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡
‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡
‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡
‡ ‡ ‡ ‡ Acknowledge ‡ ‡ ‡ ‡
‡ ‡ ‡ ‡<˜˜˜˜˜˜˜˜˜˜˜˜˜· ‡ ‡ ‡
‡ ‡Release Complete‡ ‡ ‡ ‡ ‡ ‡
‡ ‡<˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜· ‡ ‡ ‡ ‡ ‡
‡ ‡ /Facility ‡ ‡ ‡ ‡ ‡ ‡
‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡
‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡
Figure 1.3: Interrogation of call waiting
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1.2 Functions and information flows
TS GSM 04.08 specifies the procedures for call control. These shall also be used for waiting calls when
applicable.
The following Mobile Additional Function has been identified for the call waiting service:
MAF013
Call waiting related authorizations examination
The ability of a PLMN component to determine the authorizations relating to call waiting. See figure
1.4.
Location: VLR
Definitions:
Subscriber B:
The subscriber who is provided by the network with the call waiting supplementary service.
The subscriber B is always a mobile subscriber.
User B:
The user who reacts to call waiting at subscriber B. The user B is always a mobile user.
User C:
The user who has originated a call to subscriber B which causes the call waiting
supplementary service to be invoked. The user C may be a mobile user.
User A:
The user who is engaged in a call with user B. The user A may be a mobile user.
Timer T1:
This timer corresponds to T303 + T310 (as defined in TS GSM 04.08).
Timer T2:
Call Waiting Timer. This shall limit the duration of the call in the waiting condition.
Timer T3:
No Reply Condition Timer (see TS GSM 02.82).
CFNRc:
Call Forwarding on Not Reachable (see TS GSM 02.82).
CFNRy:
Call Forwarding on No Reply (see TS GSM 02.82).
CW:
Call Waiting.
The overall SDL diagram of call waiting is shown in figure 1.5. This represents the network as a whole.
The information flows are shown in figure 1.6. In these flows it is assumed that user A and user C are fixed
users and that user B is a mobile user. Functions to be performed by the fixed ISDN are not shown in the
information flows. Only the functions to be performed by the PLMN are shown.
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1.2.1 Description of overall SDL-diagram of call waiting
In the SDL-diagrams the states are dimensioned in two dimensions. The first dimension is a normal basic
call state, e.g. null or active. The second dimension is an auxiliary state associated with hold, e.g. idle or
held. Active call is represented by (active, idle) state, held call by (active, held) state.
When call waiting is active and the subscriber is connected to at least one call (active or held), the arrival
of a subsequent incoming call from user C to user B shall, if no other call is waiting, be signalled to the
mobile equipment at B as described in TS GSM 04.08. The network shall then await an acknowledgement
from the mobile termination at user B within a specific time period T1. In figure 1.5, the mobile terminated
call from user C is described as being in the "Pending Ack" state during this period. The call waiting service
is suspended for further incoming calls.
1.2.1.1 Behaviour during the "Pending Ack" state
Expiry of call control timers in T1
If no acknowledgement is received by the network from the mobile termination at user B within the time
period T1 (timer T1 expires) then the network shall initiate clearing towards the calling user C and served
user B in accordance with TS GSM 04.08. Following the expiry of call control timers in T1 the call waiting
service shall be resumed for further incoming calls.
Release of active call
User A or B may release the active call between them in the normal manner. This does not change the
state of the call from user C. Note that the MS has to indicate a normal ringing tone to the served
subscriber.
Release of call by user C
User C may release the call to user B. In this case, call clearing shall take place in the normal manner, and
the call waiting service shall be resumed for further incoming calls.
Call hold service
User B can operate the call hold service on any active calls in the normal manner.
Indication of UDUB
User B may release the call from user C using the indication of UDUB. In this case, if CFB is active the call
from user C shall be forwarded, if CFB is not active the call from user C shall be cleared. The call waiting
service is resumed for further incoming calls.
Rejection of call from user C
User B may reject the call from user C. In this case, the call from user C shall be cleared. The call waiting
service is resumed for further incoming calls.
Acknowledgement of call from user C
If the mobile termination at user B acknowledges the incoming call within the time period T1, a call is
waiting indication shall be sent towards calling user C. Timer T1 is stopped. Upon reception of alerting the
network shall await an acceptance from the controlling user B within the time period T2. In figure 1.5, the
mobile terminated call is described as being in the "Waiting" state during this period. In case the controlling
subscriber B has call forwarding on no reply active the network shall await an acceptance from user B
within the time period T3 < T2. The call waiting service is still suspended for further incoming calls.
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1.2.1.2 Behaviour during the "Waiting" State
Expiry of Timer T3
If no acceptance is received by the network within the time period T3 (timer T3 expires) the waiting call
shall be forwarded on no reply and clearing shall be initiated towards the controlling user B. The call
waiting service is resumed for further incoming calls.
Expiry of Timer T2
If call forwarding on no reply is not active and no acceptance is received within the time period T2 (timer
T2 expires), the waiting call shall be cleared by the network towards the controlling user B and the calling
user C. The call waiting service is resumed for further incoming calls.
Other Events
The following events are treated as described in section 1.2.1.1:
- release of active call;
- release of call by user C;
- call hold service;
- indication of UDUB;
- rejection of call from user C.
Acceptance of waiting call
A precondition for the acceptance of the waiting call is that there is no other call in the (active, idle) state.
The user can achieve this by releasing active calls, or using the call hold service. When user B accepts the
call from user C it becomes the (active, idle) call. Timer T2 or T3 is stopped. The call waiting service is
resumed for further incoming calls.
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Process MAF013 383_14(1)
Figure 1.4
idle
initiate
handling idle
of CW
activation is checked
CW
no
for the basic service
activated for
of the already active
the BS
call.
yes
applicability is checked
CW
no
for the basic service
applicable
of the already active
to BS
call.
yes
set indicator = set indicator =
’CW available’ ’CW not available’
process
call
waiting
CW: Call Waiting
BS: Basic Service
idle
Figure 1.4: MAF013 Call waiting related authorisations examination (VLR)
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Process Call_Waiting 383_151(9)
Figure 1.5 (sheet 1 of 10)
(active, idle)
(active, idle) (active, held)
(active, held)
mobile mobile mobile
terminated call terminated call terminated call
yes yes yes
CW available CW available CW available
(MAF013) (MAF013) (MAF013)
no no no
offer call offer call offer call
start T1 A start T1 A start T1 A
(active, idle)
(active, idle) (active, held) (active, idle)
(active, idle) (active, held) (active, held)
pending ack pending ack (active, held)
pending ack
- Messages to/from left refer to the radio interface.
- Messages to/from right refer to the network interface.
- Clearing of active calls by a remote subscriber is not shown for clarity.
Moreover, this is possible and is described in the text.
Figure 1.5 (sheet 1 of 10): Overall SDL diagram of call waiting
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Process Call_Waiting 383_152(9)
Figure 1.5 (sheet 2 of 10)
Call hold can operate on the (active, idle)
call as shown in the call hold stage 2.
(active, idle)
pending ack
clear clear
T1 clear clear
ack pending pending
expires pending (active, idle)
(busy) (reject)
clear clear
stop T1 stop T1 stop T1 stop T1
pending (active, idle)
pending ack
clear clear
notify call
A pending pending
is waiting
call call
yes
CFNRy
(active, idle)
active
no
mobile
terminated
call
start T2 start T3
A
(active, idle) CFNRy: Call Forwarding on No Reply (active, idle)
waiting pending ack
Figure 1.5 (sheet 2 of 10): Overall SDL diagram of call waiting
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Process Call_Waiting 383_153(9)
Figure 1.5 (sheet 3 of 10)
Call retrieve can operate on the (active, retrieve)
call as shown in the call hold stage 2.
(active, held)
pending ack
clear clear
T1 clear clear
ack pending pending
expires pending (active, held)
(busy) (reject)
clear clear
stop T1 stop T1 stop T1 stop T1
pending (active, held)
pending ack
clear clear
notify call
A pending pending
is waiting
call call
yes
CFNRy
(active, held)
active
accept mobile
pending terminated
no
call call
start T2 start T3 stop T1 A
ANS
(active, held) CFNRy: Call Forwarding on No reply. (active, idle) (active, held)
waiting (active, held) pending ack
Figure 1.5 (sheet 3 of 10): Overall SDL diagram of call waiting
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Process Call_Waiting 383_154(9)
Figure 1.5 (sheet 4 of 10)
Call hold service can be used to alternate between
(active, idle)
the active calls as shown in the call hold stage 2.
(active, held)
pending ack
clear clear
T1 clear clear
ack pending pending
expires pending (active, idle)
(busy) (reject)
clear clear
stop T1 stop T1 stop T1 stop T1
pending (active, idle)
(active, held)
pending ack
clear clear
notify call
A pending pending
is waiting
call call
yes
CFNRy (active, idle)
active (active, held)
no
mobile
clear
terminated
(active, held)
call
start T2 start T3
clear
A
(active, held)
(active, idle)
CFNRy: Call Forwarding on No reply. (active, idle) (active, idle)
(active, held)
pending ack pending ack
waiting
Figure 1.5 (sheet 4 of 10): Overall SDL diagram of call waiting
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Process Call_Waiting 383_155(9)
Figure 1.5 (sheet 5 of 10)
There is no active call in this case.
pending ack
clear clear accept
T1 clear
ack pending pending pending
expires pending
(busy) (reject) call
clear
stop T1 stop T1 stop T1 stop T1 stop T1
pending
ANS
clear clear
ACM A pending pending
call call
(active, idle)
yes
CFNRy
null
active
no
mobile
terminated
call
start T2 start T3
A
waiting CFNRy: Call Forwarding on No reply. pending ack
Figure 1.5 (sheet 5 of 10): Overall SDL diagram of call waiting
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Process Call_Waiting 383_156(9)
Figure 1.5 (sheet 6 of 10)
Call hold can operate on the (active, idle)
call as shown in the call hold stage 2.
(active, idle)
waiting
clear clear
T2 clear clear
waiting waiting
expires waiting (active, idle)
(busy) (reject)
clear clear
stop T2 or T3 stop T2 or T3 stop T2 or T3
waiting (active, idle)
waiting
clear clear
A waiting waiting
call call
(active, idle)
mobile
T3 expires terminated
call
clear waiting
call to MS
CFNRy: Call Forwarding on No reply
MS: Mobile Station
invoke
A
CFNRy
(active, idle)
(active, idle)
waiting
Figure 1.5 (sheet 6 of 10): Overall SDL diagram of call waiting
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Process Call_Waiting 383_157(9)
Figure 1.5 (sheet 7 of 10)
Retrieve can operate on the (active, held)
call as shown in the call hold stage 2.
(active, held)
waiting
clear clear
accept T2 clear clear
waiting waiting
waiting call expires waiting (active, held)
(busy) (reject)
clear clear
ANS stop T2 or T3 stop T2 or T3 stop T2 or T3
waiting (active, held)
waiting
clear clear
connect
A waiting waiting
waiting call
call call
mobile
(active, idle)
(active, held) T3 expires terminated
(active, held)
call
clear waiting
call to MS
CFNRy: Call Forwarding on No reply invoke
A
MS: Mobile Station CFNRy
(active, held)
(active, held)
waiting
Figure 1.5 (sheet 7 of 10): Overall SDL diagram of call waiting
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Process Call_Waiting 383_158(9)
Figure 1.5 (sheet 8 of 10)
The call hold service can be used alternate between
(active, idle)
the active calls as shown in the call hold stage 2.
(active, held)
waiting
clear clear
clear T2 clear clear
waiting waiting
(active, idle) expires waiting (active, held)
(busy) (reject)
clear clear clear
stop T2 or T3 stop T2 or T3 stop T2 or T3
(active, idle) waiting (active, held)
(active, idle)
waiting
clear clear
(active, held)
A waiting waiting
waiting
call call
mobile
(active, idle)
T3 expires terminated
(active, held)
call
clear waiting
call to MS
CFNRy: Call Forwarding on No reply invoke
A
MS: Mobile Station CFNRy
(active, idle)
(active, idle)
(active, held)
(active, held)
waiting
Figure 1.5 (sheet 8 of 10): Overall SDL diagram of call waiting
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Process Call_Waiting 383_159(9)
Figure 1.5 (sheet 9 of 10)
waiting
clear clear
accept T2 clear
waiting waiting
waiting call expires waiting
(busy) (reject)
clear
ANS stop T2 or T3 stop T2 or T3 stop T2 or T3
waiting
clear clear
connect
A waiting waiting
waiting call
call call
mobile
(active, idle) null T3 expires terminated
call
clear waiting
call to MS
CFNRy: Call Forwarding on No reply invoke
A
MS: Mobile Station CFNRy
null waiting
Figure 1.5 (sheet 9 of 10): Overall SDL diagram of call waiting
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SIST ETS 300 544 E1:2003
Page 23
ETS 300 544: March 1995 (GSM 03.83 version 4.4.1)
Macro CW_Macro_A 383_15A(1)
Figure 1.5 (sheet 10 of 10)
A CFB: Call Forwarding on mobile subscriber Busy
yes
CFB
active
no
invoke
clear call
CFB
Figure 1.5 (sheet 10 of 10): Overall SDL diagram of call waiting
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SIST ETS 300 544 E1:2003
Page 24
ETS 300 544: March 1995 (GSM 03.83 version 4.4.1)
TEa LEa TEc LEc VLR MSC MS
�˜¿ �˜¿ �˜¿ �˜¿ �˜˜˜˜˜˜¿ �˜˜˜˜˜˜¿ �˜¿
‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡
‡CHANNEL NOT AVAILABLE ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡
‡subscriber C wants to set up connection C-B ‡ ‡ ‡ ‡ ‡ ‡
‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡
‡ ‡ ‡ ‡ ‡ ‡ set-up ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡
‡ ‡ ‡ ‡ ‡ ‡˜˜˜˜˜˜˜˜˜>‡ ‡interrogation ‡ ‡ ‡ ‡ ‡ ‡
‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡˜˜˜˜˜˜˜˜˜˜˜˜˜> ‡ ‡
...
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