Content for TS 23.078 Word version: 19.0.0

1… 4.2… 4.3… 4.4… 4.5… 4.5.2… 4.5.3… 4.5.4… 4.5.5… 4.5.6… 4.5.7… 4.5.8… 4.6… 4.6.2… 4.6.3… 4.6.7… 4.6.13… 5… 6… 6.5… 6.6… 7… 7.5… 8… 9… 10… 11… 12… A…

4.6.13 VLR to MSC information flows 4.6.14 Internal MSC information flows 4.6.15 gsmSCF to HLR information flows 4.6.16 HLR to gsmSCF information flows 4.7 Interaction with supplementary services
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4.6.13 VLR to MSC information flows p. 520

4.6.13.1 Complete Call p. 520

4.6.13.1.1 Description p. 520

This IF is described in TS 23.018; it is used to instruct the MSC to continue the connection of a call.

4.6.13.1.2 Information Elements p. 521

Complete Call contains the following CAMEL specific information elements:

Information element name	MO	MF	MT	VT	NC	NP	Description
O-CSI	S	-	-	-	-	-	This IE indicates that CAMEL handling applies for an MO call. It shall be present in the response to the first interrogation for an MO call if CAMEL handling applies; otherwise it shall be absent. It shall be absent from the response to the second interrogation for an MO call.
D-CSI	C	-	-	-	-	C	This IE identifies the subscriber as having originating CAMEL dialled services.
Call Reference Number	-	-	-	M	-	-	This IE carries the Call Reference Number provided by the HLR in the Provide Roaming Number IF.
GMSC Address	-	-	-	M	-	-	This IE is the E.164 address of the GMSC.

4.6.13.2 Continue CAMEL Handling p. 521

4.6.13.2.1 Description p. 521

This IF is used to instruct the MSC to continue the CAMEL specific handling.

4.6.13.2.2 Information Elements p. 521

Information element name	Status	Description
VT-CSI	M	This IE identifies the subscriber as having terminating CAMEL services in the VMSC.
IMSI	M	This IE contains the IMSI of the B subscriber.
MSISDN	S	This IE contains the E.164 number of the B subscriber. It will be used to create the redirecting number presented to the C subscriber. It shall be present if the call is to be forwarded or if it has been provided by the HLR in the Provide Roaming Number IF, otherwise it shall be absent.
CUG Interlock	S	For the definition of this IE, see TS 23.085. It shall be present if the VLR has determined that the forwarded call is to be treated as a CUG call in accordance with the rules in TS 23.085, otherwise it shall be absent.
CUG Outgoing Access	S	For the definition of this IE, see TS 23.085. It shall be present if the VLR has determined that the forwarded call is to be treated as a CUG call with outgoing access in accordance with the rules in TS 23.085, otherwise it shall be absent.
Location Information	S	This IE contains the information to define the location of the MS: see definition in TS 23.018. It shall be present if location information was requested and is available; otherwise it shall be absent.
GMSC-Address	M	This IE is the E.164 address of the GMSC which was received in the Provide Roaming Number.
Call Reference Number	M	This IE carries the Call Reference Number provided by the HLR in the Provide Roaming Number IF.
ExtBasic Service Code	M	This IE indicates the type of basic service, i.e. teleservice or bearer service.
Subscriber State	M	This IE indicates the status of the MS. The states are: CAMELBusy: The MS is engaged on a transaction for a mobile originating or terminated circuit-switched call. NetworkDeterminedNotReachable: The network can determine from its internal data that the MS is not reachable. AssumedIdle: The state of the MS is neither "CAMELBusy" nor "NetworkDeterminedNotReachable".

4.6.13.3 Process Call Waiting p. 522

4.6.13.3.1 Description p. 522

This IF is described in TS 23.018; it is used to instruct the MSC to continue the connection of a waiting call.

4.6.13.3.2 Information Elements p. 522

Process Call Waiting contains the following CAMEL specific information elements:

Information element name	Status	Description
Call Reference Number	M	This IE carries the Call Reference Number provided by the HLR in the Provide Roaming Number IF.
GMSC Address	M	This IE is the E.164 address of the GMSC.

4.6.13.4 Send Info For ICA negative response p. 522

4.6.13.4.1 Description p. 522

This IF is used to indicate that the outgoing call leg for which the MSC requested subscription information shall not be connected.

4.6.13.4.2 Information Elements |R5| p. 522

The negative response information elements can take the following values:

Bearer service not provisioned;
Call barred (Operator determined barring);
Call barred (Supplementary service barring);
CUG reject (Inconsistent access information - index incompatible with basic service);
CUG reject (Inconsistent access information - no CUG selected);
CUG reject (Outgoing calls barred within the CUG);
CUG reject (Unknown CUG index);
Teleservice not provisioned.

4.6.13.5 Send Info For Incoming Call ack p. 522

4.6.13.5.1 Description p. 522

This IF is described in TS 23.018; it is used to indicate that the incoming call for which the MSC requested subscription information shall be forwarded.

4.6.13.5.2 Information Elements p. 522

Send Info For Incoming Call ack contains the following CAMEL specific information elements:

Information element name	Status	Description
O-CSI	S	This IE indicates that originating CAMEL service handling applies for a forwarded call. It shall be present if originating CAMEL service handling applies; otherwise it shall be absent.
D-CSI	S	This IE indicates that originating CAMEL dialled service handling applies for a forwarded call. It shall be present if originating CAMEL dialled service handling applies; otherwise it shall be absent.
Suppression Of Announcement	S	This IE indicates that announcements or tones generated when the call is forwarded shall be suppressed. It shall be present if it was received in the Provide Roaming Number for this call.
Call Reference Number	M	This IE carries the Call Reference Number provided by the HLR in the Provide Roaming Number IF.
GMSC Address	M	This IE is the E.164 address of the GMSC.
Supported CAMEL Phases	S	This IE lists the supported CAMEL phases in the GMSC. It shall be present if the VLR received it from the HLR in the Provide Roaming Number.

4.6.13.6 Send Info For Incoming Call negative response p. 523

4.6.13.6.1 Description p. 523

This IF is described in TS 23.018; it is used to indicate that the incoming call for which the MSC requested subscription information shall not be connected.

4.6.13.6.2 Information Elements p. 523

Send Info For Incoming Call negative response contains the following CAMEL specific information element which may be attached as an IE to any of the negative response values defined in TS 23.018:

Information element name	Status	Description
Suppression Of Announcement	S	This IE indicates that announcements or tones generated as a result of unsuccessful call establishment shall be suppressed. It shall be present if it was received in the Provide Roaming Number for this call.

4.6.13.7 Send Info For MT Reconnected Call ack p. 523

4.6.13.7.1 Description p. 523

This IF is used to instruct the MSC to continue the connection of a reconnected MT call.

4.6.13.7.2 Information Elements p. 523

Information element name	Required	Description
O-CSI	S	This IE indicates that originating CAMEL service handling applies for the reconnected call. It shall be present if originating CAMEL service handling applies; otherwise it shall be absent.
D-CSI	S	This IE indicates that originating CAMEL dialled service handling applies for the reconnected call. It shall be present if originating CAMEL dialled service handling applies; otherwise it shall be absent.

4.6.13.8 Send Info For MT Reconnected Call negative response p. 523

4.6.13.8.1 Description p. 523

This IF is used to indicate that the reconnected MT call for which the MSC requested subscription information shall not be connected.

4.6.13.8.2 Information Elements p. 523

The negative response information element can take the following value:

CUG reject

4.6.13.9 Send Info For Reconnected Call ack p. 524

4.6.13.9.1 Description p. 524

This IF is used to instruct the MSC to continue the connection of a reconnected MO call.

4.6.13.9.2 Information Elements p. 524

Send Info For Reconnected Call ack does not contain any information elements.

4.6.13.10 Send Info For Reconnected Call negative response |R5| p. 524

4.6.13.10.1 Description p. 524

This IF is used to indicate that the reconnected MO call for which the MSC requested subscription information shall not be connected.

4.6.13.10.2 Information Elements p. 524

The negative response information element can take the following value:

Call barred (Operator determined barring);
Call barred (Supplementary service barring).

4.6.14 Internal MSC information flows |R5| p. 524

4.6.14.1 Perform Call Forwarding ack p. 524

4.6.14.1.1 Description p. 524

This IF is defined in TS 23.018; it is used to inform the MSC that Call Forwarding is taking place.

4.6.14.1.2 Information Elements p. 524

Perform Call Forwarding ack is defined in TS 23.018. The following differences apply:

Information element name	Status	Description
Forwarded-to Number	M	If the Forwarded-to Number is not available due to CAMEL handling (a Disconnect Leg IF has been received for Leg 2), then the MSC shall populate this parameter with a dummy number.

4.6.15 gsmSCF to HLR information flows |R5| p. 524

4.6.15.1 Send Routeing Info p. 524

4.6.15.1.1 Description p. 524

This IF is defined in TS 23.018 and subclause 4.6.10.1; it is used to request information from the HLR to route a gsmSCF initiated call.

Refer to TS 29.007 for the usage of ISDN BC, ISDN LLC, ISDN HLC and MSISDN for the selection of the PLMN Basic Service.

4.6.15.1.2 Information Elements p. 525

Send Routeing Info from the gsmSCF contains the following information elements:

Information element name	Status	Description
MSISDN	M	This IE indicates the MSISDN of the called subscriber.
Alerting Pattern	O	This IE indicates the kind of Alerting Pattern to be applied.
CUG Interlock	O	For the definition of this IE, see TS 23.085.
CUG Outgoing Access	O	For the definition of this IE, see TS 23.085.
Suppression Of Announcement	O	This IE indicates that announcements or tones generated as a result of unsuccessful call establishment shall be suppressed.
Suppress T-CSI	M	This IE indicates that CAMEL subscription information should not be returned in the first Send Routeing Info ack (to avoid the need for a second interrogation).
Supported CAMEL Phases	M	This IE indicates the CAMEL Phases supported by the gsmSCF.
Offered CAMEL4 CSIs	S	This IE indicates the CAMEL phase 4 CSIs offered by the gsmSCF. This IE shall be present when the Supported CAMEL Phases IE indicates support of CAMEL Phase 4. This IE is described in a Table below.
Call Reference Number	M	This IE carries the Call Reference Number allocated for the call by the gsmSCF.
GMSC Or gsmSCF Address	M	This IE is the E.164 address of the gsmSCF.
Call Diversion Treatment Indicator	O	This IE indicates whether or not the call is allowed to be forwarded on behalf of the called party using the Call Forwarding supplementary service.
Pre-paging Supported	S	This IE shall be present if the gsmSCF supports pre-paging, otherwise it shall be absent.
Interrogation Type	M	This IE shall contain the value "Basic Call".
Long FTN Supported	O	This IE indicates that the gsmSCF supports Long Forwarded to Numbers.
gsmSCF Initiated Call	M	This IE indicates that the IF was originated by a gsmSCF.
Suppress Incoming Call Barring	O	This IE indicates that Incoming Call Barrings shall be suppressed for the called party.
Suppress VT-CSI	O	This IE indicates that VT-CSI shall be suppressed.
ISDN BC	O	ISDN bearer capability. See TS 23.018.
ISDN LLC	O	ISDN lower layer compatibility. See TS 23.018.
ISDN HLC	O	ISDN higher layer compatibility. See TS 23.018.
Suppress MT SS	O	This IE indicates the MT supplementary services that shall be suppressed for the called party.

Offered CAMEL4 CSIs contains the following information elements:

Information element name	Status	Description
O-CSI	S	This IE indicates the offer of CAMEL phase 4 O-CSI.
D-CSI	S	This IE indicates the offer of CAMEL phase 4 D-CSI.
T-CSI	S	This IE indicates the offer of CAMEL phase 4 T-CSI.

4.6.16 HLR to gsmSCF information flows |R5| p. 525

4.6.16.1 Send Routeing Info ack p. 525

4.6.16.1.1 Description p. 525

This IF is described in subclause 4.6.9.1; it is used by the HLR to transfer the requested routeing information to the gsmSCF.

4.6.16.2 Send Routeing Info negative response p. 525

4.6.16.2.1 Description p. 525

This IF is described in TS 23.018; it is used by the HLR to indicate that the routeing information is not available.

4.7 Interaction with supplementary services p. 526

When the gsmSCF initiates a call to a subscriber, the gsmSCF can indicate to the HLR the MT supplementary services that shall be suppressed for this call.

4.7.1 Line identification p. 526

For a call subject to CAMEL control, the gsmSCF shall have the option to send the Calling Party Restriction Indicator to the gsmSSF. This information element will be sent to the MSC and shall indicate whether the CLI Presentation Indicator present in the Calling Party Number shall be set by CAMEL action to Restricted.

4.7.2 Call forwarding services p. 526

4.7.2.1 Registration of Call Forwarding p. 526

The functional behaviour for the registration of the Call Forwarding supplementary service is defined in TS 23.082. The procedure specific to CAMEL is defined in this subclause:

CAMEL_Check_CF_Interaction.

(not reproduced yet)

Figure 4.120-1: Procedure CAMEL_Check_CF_Interaction (sheet 1)

4.7.2.2 Invocation of Call Forwarding p. 527

The functional behaviour for the invocation of the Call Forwarding supplementary service is defined in TS 23.018 and TS 23.082. The following additional requirements apply.

When Call Forwarding is invoked for a CAMEL subscriber with O-CSI, the gsmSSF shall send the FTN to the gsmSCF in the format in which it was received from the HLR. When Call Forwarding is invoked for a CAMEL subscriber with D-CSI or if an N-CSI is present in the forwarding MSC, then the FTN shall be treated as defined in subclause 4.2.1.2.2.

If the Service Interaction Indicators Two parameter was included in the Initial Address Message, the Continue With Argument information flow or the Connect message, the appropriate indicator shall be applied for the forwarded call.

An HLR shall not send an FTN which is not in international format to a GMSC which does not support CAMEL phase 2, i.e. if the HLR is handling a request from a GMSC for routeing information and the forwarded-to number is registered in a format other than international, the service logic in the HLR shall behave as if the call forwarding is provisioned but not registered.

4.7.2.3 Invocation of Call Deflection p. 528

The functional behaviour for the invocation of the Call Deflection supplementary service is defined in TS 23.018 and TS 23.072. The following additional requirements apply.

When Call Deflection is invoked by a CAMEL subscriber with O-CSI, the gsmSSF shall send the DTN to the gsmSCF in the format in which it was received from the MS. When Call Deflection is invoked by a CAMEL subscriber with D-CSI or if a N-CSI is present in the VMSC, then the DTN shall be treated as defined in subclause 4.2.1.2.2.

If the Service Interaction Indicators Two parameter was included in the Initial Address Message, the Continue With Argument information flow or the Connect information flow, the appropriate indicator shall be applied for the deflected call.

4.7.3 Call Barring services p. 528

When a CAMEL subscriber with O-CSI and TIF-CSI attempts to activate a conditional call barring service (BOIC,BOIC-exHC), the HLR shall not check the interactions with call forwarding.

When the gsmSCF initiates a call to a subscriber, the gsmSCF can indicate to the HLR that incoming call barrings shall be suppressed for this call.

When the gsmSCF creates an additional call leg in an existing call, the gsmSCF can indicate to the VLR (via the gsmSSF and MSC) that outgoing call barrings shall be suppressed for this call leg.

4.7.4 Closed User Group p. 528

For a CUG subscriber with CAMEL services:

The HLR shall store (and transfer to the VLR) the necessary subscriber data to ensure that the served subscriber is not unnecessarily prevented by CUG constraints from originating calls.
The HLR shall store the necessary subscriber data to ensure that the served subscriber is not unnecessarily prevented by CUG constraints from receiving calls.

For an MO, MF or TO call, the CUG information for that call shall be sent to the gsmSCF in the Initial DP information flow.

If the gsmSCF returns a Continue information flow, the call shall continue with the original CUG information unchanged.

If the gsmSCF returns a Connect or Continue With Argument information flow, the CUG handling in Table 4.7 applies.

Table 4.7: CUG handling on receipt of Connect or Continue With Argument for an MO, MF or TO call

CUG parameters in information flow	Handling
Non-CUG call (note 1)	Remove CUG information for the call and continue as a non-CUG call
CUG information (note 2)	Call shall continue with modified CUG information
No CUG information	Call shall continue with original CUG information
NOTE 1: Received in Service Interaction Indicators Two IE. NOTE 2: CUG information consists of at least one of CUG Interlock Code and Outgoing Access Indicator.

For an MT call which is to be routed to the terminating subscriber, the CUG information shall be extracted from the Send Routeing Information ack and sent to the gsmSCF in the Initial DP, but the gsmSCF shall not have the ability to change the CUG information for the call.

For an VT call which is to be routed to the terminating subscriber, the CUG information shall be extracted from the incoming ISUP IAM and sent to the gsmSCF in the Initial DP, but the gsmSCF shall not have the ability to change the CUG information for the call.

For an MT or VT call which is subject to CAMEL forwarding, the gsmSCF shall return a Connect information flow and the CUG handling in Table 4.7 applies.