SIST EN 300 359-1 V1.2.4:2005

SLOVENSKI STANDARD
01-julij-2005
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Integrated Services Digital Network (ISDN); Completion of Calls to Busy Subscriber
(CCBS) supplementary service; Digital Subscriber Signalling System No. one (DSS1)
protocol; Part 1: Protocol specification
Ta slovenski standard je istoveten z: EN 300 359-1 Version 1.2.4
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.

EN 300 359-1 V1.2.4 (1998-06)
European Standard (Telecommunications series)
Integrated Services Digital Network (ISDN);
Completion of Calls to Busy Subscriber (CCBS)
supplementary service;
Digital Subscriber Signalling System No. one (DSS1) protocol;
Part 1: Protocol specification

2 EN 300 359-1 V1.2.4 (1998-06)
Reference
REN/SPS-05145-G-1 (3bo90iqo.PDF)
Keywords
ISDN, CCBS, DSS1, supplementary service
ETSI
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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 1998.
All rights reserved.
ETSI
3 EN 300 359-1 V1.2.4 (1998-06)
Contents
Intellectual Property Rights.6
Foreword .6
1 Scope.8
2 Normative references .8
3 Definitions.9
4 Abbreviations.10
5 Description.10
6 Operational requirements.11
6.1 Provision and withdrawal. 11
6.2 Requirements on the network A side . 11
6.3 Requirements on the network B side. 11
7 Coding requirements .12
8 State definitions .15
8.1 User A states . 15
8.2 User B states . 15
8.3 Network A states. 16
8.4 Network B states. 16
9 Signalling procedures at the coincident S and T reference point .16
9.1 Activation . 16
9.1.1 Normal operation . 16
9.1.2 Exceptional procedures . 17
9.2 User initiated deactivation procedure . 19
9.2.1 Normal operation . 19
9.2.2 Exceptional procedures . 19
9.3 Interrogation . 19
9.3.1 General interrogation. 19
9.3.1.1 Normal operation. 19
9.3.1.2 Exceptional procedures. 20
9.3.2 Specific interrogation . 20
9.3.2.1 Normal operation. 20
9.3.2.2 Exceptional procedures. 20
9.4 Invocation and operation . 21
9.4.1 Recall indication. 21
9.4.1.1 Normal operation. 21
9.4.1.2 Exceptional procedures. 21
9.4.2 CCBS call request . 22
9.4.2.1 Normal operation. 22
9.4.2.2 Exceptional procedures. 22
9.4.3 CCBS call establishment . 23
9.4.3.1 Normal operation. 23
9.4.3.2 Exceptional procedures. 23
9.4.4 Network initiated deactivation procedures. 24
9.4.4.1 Normal operation. 24
9.4.4.2 Exceptional procedures. 24
9.4.5 B free but A busy procedure. 24
9.4.5.1 Normal operation. 24
9.4.5.2 Exceptional procedures. 25
9.4.6 User A monitoring procedure. 25
9.4.6.1 Normal operation. 25
9.4.6.2 Exceptional procedures. 25
9.5 Procedures at network B . 25
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4 EN 300 359-1 V1.2.4 (1998-06)
9.5.1 Determination that CCBS is available. 25
9.5.1.1 Normal operation. 25
9.5.1.2 Exceptional procedures. 26
9.5.2 Acceptance of a CCBS request . 26
9.5.2.1 Normal operation. 26
9.5.2.2 Exceptional procedures. 26
9.5.3 Queue B processing. 26
9.5.3.1 Normal operation. 26
9.5.3.2 Exceptional procedures. 27
9.5.4 Determination of user B free . 27
9.5.4.1 Normal operation. 27
9.5.4.2 Exceptional procedures. 28
9.5.5 CCBS call. 28
9.5.5.1 Normal operation. 28
9.5.5.2 Exceptional procedures. 29
9.6 Call information retention. 29
9.6.1 Normal operation . 29
9.6.2 Exceptional procedures . 30
9.7 Basic call information and compatibility checking at user A. 30
9.7.1 Normal operation . 30
9.7.2 Exceptional procedures . 30
10 Procedures for interworking with private ISDNs .31
10.1 Procedures for the originating T reference point . 31
10.1.1 CCBS available indication . 31
10.1.1.1 Normal operation. 31
10.1.1.2 Exceptional procedures. 31
10.1.2 CCBS supplementary service request. 31
10.1.2.1 Normal operation. 31
10.1.2.2 Exceptional procedures. 32
10.1.3 User B free indication . 32
10.1.3.1 Normal operation. 32
10.1.3.2 Exceptional procedures. 32
10.1.4 Suspend request. 33
10.1.4.1 Normal operation. 33
10.1.4.2 Exceptional procedures. 33
10.1.5 Resume request . 33
10.1.5.1 Normal operation. 33
10.1.5.2 Exceptional procedures. 33
10.1.6 CCBS call establishment . 33
10.1.6.1 Normal operation. 33
10.1.6.2 Exceptional procedures. 33
10.1.7 Deactivation . 34
10.1.7.1 Normal operation. 34
10.1.7.2 Exceptional procedures. 34
10.2 Procedures for the destination T reference point . 34
10.2.1 CCBS available indication . 34
10.2.1.1 Normal operation. 34
10.2.1.2 Exceptional procedures. 34
10.2.2 CCBS supplementary service request. 35
10.2.2.1 Normal operation. 35
10.2.2.2 Exceptional procedures. 35
10.2.3 User B free indication . 36
10.2.3.1 Normal operation. 36
10.2.3.2 Exceptional procedures. 36
10.2.4 Suspend request. 36
10.2.4.1 Normal operation. 36
10.2.4.2 Exceptional procedures. 36
10.2.5 Resume request . 36
10.2.5.1 Normal operation. 36
10.2.5.2 Exceptional procedures. 37
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5 EN 300 359-1 V1.2.4 (1998-06)
10.2.6 CCBS call establishment . 37
10.2.6.1 Normal operation. 37
10.2.6.2 Exceptional procedures. 37
10.2.7 Deactivation . 38
10.2.7.1 Normal operation. 38
10.2.7.2 Exceptional procedures. 38
11 Interactions with other networks.38
12 Interactions with other supplementary services.38
13 Parameter values (timers).38
14 Dynamic description (SDL diagrams) .39
Annex A (informative): CCBS signalling flows.77
Annex B (normative): Provision of status request procedures.85
Annex C (informative): Assignment of object identifier values.86
Annex D (informative): Changes with respect to the previous ETS 300 359-1 .87
History.88
ETSI
6 EN 300 359-1 V1.2.4 (1998-06)
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.fr/ipr or 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 Committee Signalling
Protocols and Switching (SPS).
The present document is part 1 of a multi-part standard covering the Digital Subscriber Signalling System No. one
(DSS1) protocol specification for the Integrated Services Digital Network (ISDN) Completion of Calls to Busy
Subscriber (CCBS) supplementary service, 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 for the user";
Part 4: "Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT)
proforma specification for the user";
Part 5: "Test Suite Structure and Test Purposes (TSS&TP) specification for the network";
Part 6: "Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT)
proforma specification for the network".
In accordance with CCITT Recommendation I.130, the following three level structure is used to describe the
supplementary telecommunication services as provided by European public telecommunications operators under the
pan-European ISDN:
- Stage 1: is an overall service description, from the user's standpoint;
- Stage 2: identifies the functional capabilities and information flows needed to support the service described in
stage 1; and
- Stage 3: defines the signalling system protocols and switching functions needed to implement the service
described in stage 1.
The present document details the stage 3 aspects (signalling system protocols and switching functions) to support the
CCBS supplementary service. The stage 1 and stage 2 aspects are detailed in ETS 300 357 and ETS 300 358,
respectively.
The present version updates the references to the basic call specifications.
ETSI
7 EN 300 359-1 V1.2.4 (1998-06)
National transposition dates
Date of adoption of this EN: 19 June 1998
Date of latest announcement of this EN (doa): 30 September 1998
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 March 1999
Date of withdrawal of any conflicting National Standard (dow): 31 March 1999
ETSI
8 EN 300 359-1 V1.2.4 (1998-06)
1 Scope
This first part of EN 300 359 specifies the stage three of the Completion of Calls to Busy Subscriber (CCBS)
supplementary service for the pan-European Integrated Services Digital Network (ISDN) as provided by European
public telecommunications operators at the T reference point or coincident S and T reference point (as defined in
ITU-T Recommendation I.411 [6]) by means of the Digital Subscriber Signalling System No. one (DSS1) protocol.
Stage three identifies the protocol procedures and switching functions needed to support a telecommunication service
(see CCITT Recommendation I.130 [3]).
In addition, the present document specifies the protocol requirements at the T reference point where the service is
provided to the user via an intermediate private ISDN.
The present document does not specify the additional protocol requirements where the service is provided to the user via
a telecommunications network that is not an ISDN.
The CCBS supplementary service enables user A, encountering a busy destination B, to have the call completed without
having to make a new call attempt when the busy destination B becomes not busy.
The CCBS supplementary service is applicable to all circuit-switched telecommunication services, except the video
telephony teleservice involving a second connection.
Further parts of EN 300 359 specify the method of testing required to identify conformance to the present document.
The present document is applicable to equipment supporting the CCBS supplementary service, to be attached at either
side of a T reference point or coincident S and T reference point when used as an access to the public ISDN.
2 Normative references
References may be made to:
a) specific versions of publications (identified by date of publication, edition number, version number, etc.), in
which case, subsequent revisions to the referenced document do not apply; or
b) all versions up to and including the identified version (identified by "up to and including" before the version
identity); or
c) all versions subsequent to and including the identified version (identified by "onwards" following the version
identity); or
d) publications without mention of a specific version, in which case 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] CCITT Recommendation E.164: "Numbering plan for the ISDN era".
[2] ITU-T Recommendation I.112: "Vocabulary of terms for ISDNs".
[3] CCITT Recommendation I.130 (1988): "Method for the characterization of telecommunication
services supported by an ISDN and network capabilities of an ISDN".
[4] ITU-T Recommendation I.210: "Principles of telecommunication services supported by an ISDN
and the means to describe them".
[5] ITU-T Recommendation I.221 (1993): "Common specific characteristics of services".
[6] ITU-T Recommendation I.411 (1993): "ISDN user-network interfaces - Reference configurations".
[7] CCITT Recommendation Q.9 (1988): "Vocabulary of switching and signalling terms".
[8] CCITT Recommendation X.208 (1988): "Specification of Abstract Syntax Notation One
(ASN.1)".
ETSI
9 EN 300 359-1 V1.2.4 (1998-06)
[9] CCITT Recommendation X.219 (1988): "Remote Operations: Model, notation and service
definition".
[10] CCITT Recommendation Z.100 (1988): "Specification and Description Language (SDL)".
[11] EN 300 403-1: "Integrated Services Digital Network (ISDN); Digital Subscriber Signalling System
No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control; Part 1:
Protocol specification [ITU-T Recommendation Q.931 (1993), modified]".
[12] EN 300 403-2: "Integrated Services Digital Network (ISDN); Digital Subscriber Signalling System
No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control; Part 2:
Specification and Description Language (SDL) diagrams".
[13] EN 300 195-1: "Integrated Services Digital Network (ISDN); Supplementary service interactions;
Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification".
[14] EN 300 196-1: "Integrated Services Digital Network (ISDN); Generic functional protocol for the
support of supplementary services; Digital Subscriber Signalling System No. one (DSS1) protocol;
Part 1: Protocol specification".
[15] EN 300 267-1: "Integrated Services Digital Network (ISDN); Telephony 7 kHz and
videotelephony teleservices; Digital Subscriber Signalling System No. one (DSS1) protocol;
Part 1: Protocol specification".
[16] ETS 300 358: "Integrated Services Digital Network (ISDN); Completion of Calls to Busy
Subscriber (CCBS) supplementary service; Functional capabilities and information flows".
3 Definitions
For the purposes of the present document, the following definitions apply:
busy: See ITU-T Recommendation I.221 [5], subclause 2.1.5.
call: See CCITT Recommendation Q.9 [7], definition 2201.
call information retention: A procedure of network A to store the call information of a specific call so that it can be
used for that call.
call state: A state as defined in EN 300 403-1 [11], subclause 2.1 for either the user or the network as appropriate. A
call state may exist for each call reference value (and for each additional responding CEI in the incoming call states).
CCBS busy: Any one of the following conditions will cause a CCBS busy condition:
- maximum number of calls reached at user A (see ITU-T Recommendation I.221 [5], subclause 2.1.3,
item 2));
- no B-channels available at user A;
- CCBS recall pending on user A.
CCBS call: A call which is established under the control of the CCBS supplementary service.
CCBS recall: The procedure where user A is requested to complete the communication when user B ceases to be busy.
CCBS request retention: If an attempt to establish a CCBS call fails because the destination is busy again, then the
network provider option "CCBS request retention" defines whether the CCBS supplementary service shall continue or
not, i.e. if the "CCBS request retention" is supported, the original CCBS request shall retain its position in the queue B,
and monitoring of user B shall continue. Otherwise the CCBS request will be deactivated.
destination B: The entity addressed in the original call.
existing service: The basic telecommunication service associated with speech, 3,1 kHz audio and 64 kbit/s unrestricted
bearer capabilities.
ETSI
10 EN 300 359-1 V1.2.4 (1998-06)
Integrated Services Digital Network (ISDN): See ITU-T Recommendation I.112 [2], definition 308.
invoke component: See EN 300 196-1 [14], subclause 8.2.2.1. Where reference is made to an "xxxx" invoke
component, an invoke component is meant with its operation value set to the value of the operation "xxxx".
ISDN number: A number conforming to the numbering plan and structure specified in CCITT Recommendation
E.164 [1].
network: The DSS1 protocol entity at the network side of the user-network interface.
network A: The network, at the coincident S and T reference point, to which user A is attached.
network B: The network, at the coincident S and T reference point, which is identified as destination B.
private network: The DSS1 protocol entity at the user side of the user-network interface at the T reference point.
public network: The DSS1 protocol entity at the network side of the user-network interface at the T reference point.
queue A: A buffer at network A for the control of CCBS requests associated with user A, provided on a per-ISDN
number basis.
queue B: A buffer at network B for the control of CCBS requests associated with destination B. Resource is provided in
the buffer for each ISDN number, but the buffer is processed on a per-access basis. The buffer is used to support the
monitoring of user B to become not busy.
reject component: See EN 300 196-1 [14], subclause 8.2.2.4.
return error component: See EN 300 196-1 [14], subclause 8.2.2.3. Where reference is made to an "xxxx" return error
component, a return error component is meant which is related to an "xxxx" invoke component.
return result component: See EN 300 196-1 [14], subclause 8.2.2.2. Where reference is made to an "xxxx" return
result component, a return result component is meant which is related to an "xxxx" invoke component.
service; telecommunication service: See ITU-T Recommendation I.112 [2], definition 201.
supplementary service: See ITU-T Recommendation I.210 [4], subclause 2.4.
user: The DSS1 protocol entity at the user side of the user-network interface.
user A: The user, at the coincident S and T reference point, who originated the call and to whom the CCBS
supplementary service is provided.
user B: The user, at the coincident S and T reference point, which is identified as destination B.
4 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ASN.1 Abstract Syntax Notation One
CCBS Completion of Calls to Busy Subscriber
DCR Dummy Call Reference
DSS1 Digital Subscriber Signalling System No. one
ISDN Integrated Services Digital Network
5 Description
The CCBS supplementary service enables user A, encountering a busy destination B, to have the call completed without
having to make a new call attempt when the destination B becomes not busy.
When user A requests the CCBS supplementary service, the network B will monitor destination B for becoming not
busy.
ETSI
11 EN 300 359-1 V1.2.4 (1998-06)
When the destination B becomes not busy, (i.e. access resources e.g. one B-channel are not busy) then the network will
wait a short time in order to allow the resources to be reused for originating a call. If the resources are not reused within
this time by destination B, then the network B will automatically recall user A.
When user A accepts the CCBS recall, then network A will automatically generate a CCBS call to destination B.
6 Operational requirements
6.1 Provision and withdrawal
CCBS may be provided to subscribers by the service provider on a subscription basis or may be generally available.
Withdrawal may happen on subscriber's request or for administrative reasons.
As a service provider option, the CCBS supplementary service can be offered with a subscription option which shall
apply to the whole access of user A.
Table 1 summarizes the subscription options for the CCBS supplementary service.
Table 1: Subscription option
Subscription option Value Meaning
Recall mode Global recall CCBS recall offered to all compatible terminals.
Specific recall CCBS recall offered to the terminal which has activated the
CCBS supplementary service.
If the subscription option is not offered, one of the two values shall be chosen by the network provider.
Table 2 summarizes the network options which apply to the CCBS supplementary service.
Table 2: Network options
Network option Value Meaning
Check for identical calls Yes The network checks if CCBS is requested for a call
identical to a call for which CCBS is already activated.
No The network does not check if CCBS is requested for a call
identical to a call for which CCBS is already activated.
CCBS request retention Yes User A's CCBS request is continued if user B is busy
again.
No User A's CCBS request does not continue if user B is busy
again. User A can activate CCBS again.
6.2 Requirements on the network A side
The network A side shall register whether the CCBS supplementary service specific functions have to be performed in
network A or in an attached private ISDN.
6.3 Requirements on the network B side
The network B side shall register whether the CCBS supplementary service specific functions have to be performed in
the network B or in an attached private ISDN.
ETSI
12 EN 300 359-1 V1.2.4 (1998-06)
7 Coding requirements
Tables 3 and 4 show the definition of the operations and errors required for the CCBS supplementary service using
ASN.1 as defined in CCITT Recommendation X.208 [8] and using the OPERATION and ERROR macro as defined in
figure 4/X.219 of CCITT Recommendation X.219 [9].
The formal definition of the component types to encode these operations is provided in EN 300 196-1 [14], clause D.1.
The inclusion of components in Facility information elements is defined in EN 300 196-1 [14], subclause 11.2.
Table 3: ASN.1 description of CCBS operations and errors used at the
coincident S and T reference point
CCBS-Operations-and-Errors {ccitt identified-organization etsi(0) 359 operations-and-errors(1)}
DEFINITIONS EXPLICIT TAGS ::=
BEGIN
EXPORTS       CallInfoRetain, EraseCallLinkageID,
CCBSRequest, CCBSDeactivate, CCBSInterrogate, CCBSErase,
CCBSRemoteUserFree, CCBSCall, CCBSStatusRequest, CCBSBFree,
CCBSStopAlerting,
InvalidCallLinkageID, InvalidCCBSReference, LongTermDenial, ShortTermDenial,
CCBSIsAlreadyActivated, AlreadyAccepted, OutgoingCCBSQueueFull,
CallFailureReasonNotBusy, NotReadyForCall;
IMPORTS       OPERATION, ERROR
FROM Remote-Operation-Notation
{joint-iso-ccitt remote-operations(4) notation(0)}
notSubscribed, supplementaryServiceInteractionNotAllowed
FROM General-Errors
{ccitt identified-organization etsi(0) 196 general-errors(2)}
Address, PartyNumber, PartySubaddress
FROM Addressing-Data-Elements
{ccitt identified-organization etsi(0) 196 addressing-data-elements(6)}
Q931InformationElement
FROM Embedded-Q931-Types
{ccitt identified-organization etsi(0) 196 embedded-q931-types(7)};
CallInfoRetain       ::= OPERATION
ARGUMENT  callLinkageID    CallLinkageID
EraseCallLinkageID     ::= OPERATION
ARGUMENT  callLinkageID    CallLinkageID
CCBSRequest         ::= OPERATION
ARGUMENT  callLinkageID    CallLinkageID
RESULT SEQUENCE {
recallMode     RecallMode,
cCBSReference    CCBSReference}
ERRORS   {notSubscribed, InvalidCallLinkageID, ShortTermDenial,
LongTermDenial, CCBSIsAlreadyActivated,
supplementaryServiceInteractionNotAllowed,
OutgoingCCBSQueueFull, CallFailureReasonNotBusy}
CCBSInterrogate       ::= OPERATION
ARGUMENT SEQUENCE {
cCBSReference    CCBSReference OPTIONAL,
partyNumberOfA   PartyNumber OPTIONAL}
RESULT SEQUENCE {
recallMode     RecallMode,
callDetails     CallDetails OPTIONAL}
ERRORS   {InvalidCCBSReference, notSubscribed}
CCBSDeactivate       ::= OPERATION
ARGUMENT  cCBSReference    CCBSReference
RESULT
ERRORS {InvalidCCBSReference}
ETSI
13 EN 300 359-1 V1.2.4 (1998-06)
Table 3 (continued): ASN.1 description of CCBS operations and errors used at the
coincident S and T reference point
CCBSErase          ::= OPERATION
ARGUMENT SEQUENCE {
recallMode     RecallMode,
cCBSReference    CCBSReference,
addressOfB     Address,
q931InfoElement   Q931InformationElement,
eraseReason     CCBSEraseReason}
-- The Bearer capability, High layer compatibility (optional) and Low layer compatibility
-- (optional) information elements shall be embedded in q931InfoElement.
CCBSRemoteUserFree     ::= OPERATION
ARGUMENT SEQUENCE {
recallMode     RecallMode,
cCBSReference    CCBSReference,
addressOfB     Address,
q931InfoElement   Q931InformationElement}
-- The Bearer capability, High layer compatibility (optional) and Low layer compatibility
-- (optional) information elements shall be embedded in q931InfoElement.
CCBSBFree          ::= OPERATION
ARGUMENT SEQUENCE {
recallMode     RecallMode,
cCBSReference    CCBSReference,
addressOfB     Address,
q931InfoElement   Q931InformationElement}
-- The Bearer capability, High layer compatibility (optional) and Low layer compatibility
-- (optional) information elements shall be embedded in q931InfoElement.
CCBSCall          ::= OPERATION
ARGUMENT  cCBSReference    CCBSReference
ERRORS   {InvalidCCBSReference, AlreadyAccepted,
NotReadyForCall}
CCBSStatusRequest      ::= OPERATION
ARGUMENT SEQUENCE {
recallMode     RecallMode,
cCBSReference    CCBSReference,
q931InfoElement   Q931InformationElement}
RESULT BOOLEAN -- free=TRUE, busy=FALSE
-- The Bearer capability, High layer compatibility (optional) and Low layer compatibility
-- (optional) information elements shall be embedded in q931InfoElement.
CCBSStopAlerting      ::= OPERATION
ARGUMENT  cCBSReference    CCBSReference
CallDetails         ::= SEQUENCE SIZE(1.5) OF CallInformation
CallInformation       ::= SEQUENCE {
addressOfB     Address,
q931InfoElement   Q931InformationElement,
cCBSReference    CCBSReference,
subAddressOfA    PartySubaddress OPTIONAL}
-- The Bearer capability, High layer compatibility (optional) and Low layer compatibility
-- (optional) information elements shall be embedded in q931InfoElement.
InvalidCallLinkage
...