Content for TS 23.278 Word version: 18.0.0
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4.6.1.1
4.6.1.2
4.6.1.3
4.6.1.4
4.6.1.5
4.6.1.6
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4.7 Descriptions of information Flows
4.7.1 IM-SSF to gsmSCF information flows
4.7.1.1 Activity Test ack
4.7.1.2 Apply Charging Report
4.7.1.3 Call Gap
4.7.1.4 Call Information Report
4.7.1.5 Event Report BCSM
4.7.1.6 Initial DP
4.7.1.7 Specialized Resource Report
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4.7 Descriptions of information Flows p. 129
This clause contains the detailed description of the information flows used by CAMEL for IP Multimedia Subsystems call control.
Each Information Element (IE) is marked as Mandatory (M), Conditional (C), Specific conditions (S), mutually Exclusive (E), Optional (O) or not applicable (-) for each different traffic case: IP Multimedia Origination (IM_Orig), IP Multimedia Termination (IM_Term). The distinction between IM_Orig and IM_Term calls is not applicable to all Information Flows.
An 'M' IE shall always be included for the corresponding traffic case. A 'C' IE shall be included if the sending entity has the necessary information to populate the IE. The conditions for the inclusion of an 'S' IE are shown in the 'Description' column of the definition table. When a set of 'E' IEs is shown in the definition of an Information Flow or compound IE, only one of those IEs may be included. An 'O' IE may be included or omitted as required by the service logic. A '-' IE shall always be omitted for the corresponding traffic case. This categorization is a functional classification, i.e. it defines the requirements for the stage 2 information. It is not a stage 3 classification to be used for the ASN.1 syntax of the protocol.
Details of errors and exceptions to these rules are specified in TS 29.278.
4.7.1 IM-SSF to gsmSCF information flows p. 129
4.7.1.1 Activity Test ack p. 129
4.7.1.1.1 Description p. 129
This IF is the response to the Activity Test.
4.7.1.1.2 Information Elements p. 129
This IF contains no information elements.
4.7.1.2 Apply Charging Report p. 129
4.7.1.2.1 Description p. 129
This IF is used by the IM-SSF to report to the gsmSCF the information requested in the Apply Charging IF.
4.7.1.2.2 Information Elements p. 129
| Information element name | Status | Description |
|---|---|---|
| Call Result | M | This IE contains the charging information to be provided by the IM-SSF. |
Call Result contains the following information:
| Information element name | Status | Description |
|---|---|---|
| Time Duration Charging Result | M | This IE is a list defined in the next Table. |
Time Duration Charging Result contains the following information:
| Information element name | Status | Description |
|---|---|---|
| Time Information | M | This IE is a choice between Time if No Tariff Switch and Time if Tariff Switch. This IE is described in the next Table. |
| Party To Charge | M | This IE is received in the related ApplyCharging operation to correlate the result to the request. This IE shall be a copy of the corresponding IE received in the Apply Charging operation. |
| Call Active | M | This IE indicates whether the call is active or not. |
| Call Released at Tcp Expiry | C | This element is an indication that the IM-SSF has released the call and terminated the dialogue, due to Tcp expiry. It shall be present when ACR is sent due to Tcp expiry and the IM-SSF has released the call (because "ReleaseIfExceeded" was present in ACH operation). In all other circumstances, this element shall be absent. |
Time Information contains one of the following information:
| Information element name | Status | Description |
|---|---|---|
| Time If No Tariff Switch | C | This IE will be present if no tariff switch has occurred since the reception of the first Apply Charging IF for the connection to the Called Party or the MRFC connection, otherwise it will be absent. If Answer was detected for the connection to the Called Party or the MRFC connection, then the elapsed time since detection of Answer shall be reported. If answer was not detected, it shall be set to "0". |
| Time If Tariff Switch | C | This IE will be present if a tariff switch has occurred since the reception of the first Apply Charging IF for the connection to the Called Party or the MRFC connection, otherwise it will be absent. |
4.7.1.3 Call Gap p. 131
4.7.1.3.1 Description p. 131
This IF is used to activate/modify/remove a call gap mechanism in the IM-SSF. The call gap mechanism is used to reduce the rate at which specific service requests are sent to a gsmSCF.
A Call Gap operation can only be sent on an opened dialogue between a gsmSCF and the IM-SSF.
It is possible to have several call gapping conditions applicable to the same IM-SSF (i.e. each conditions were activated for a defined Service (identified by the serviceKey) by a defined gsmSCF (identified by the gsmSCFAddress).
4.7.1.3.2 Information Elements p. 131
| Information element name | Status | Description |
|---|---|---|
| Gap Criteria | M | This IE specifies the criteria for a call to be subject to call gapping. |
| Gap Indicators | M | This parameter indicates the gapping characteristics. |
| Control Type | O | This parameter indicates the reason for activating call gapping. The value "sCPOverloaded" indicates that an automatic congestion detection and control mechanism in the SCP has detected a congestion situation. The value "manuallyInitiated" indicates that the service and or network/service management centre has detected a congestion situation, or any other situation that requires manually initiated controls. The controlType "manuallyInitiated" will have priority over "sCPOverloaded" call gap. |
| Gap Treatment | O | This parameter indicates how calls that were rejected due to the call gapping condition and for which the Default Call Handling was set to "Release Call" shall be treated. |
|
M:
Mandatory (The IE shall always be sent).
O:
Optional (Service logic dependent).
|
||
Gap Criteria contains one of the following (Choice):
| Information element name | Status | Description |
|---|---|---|
| Basic Gap Criteria | O | This IE is a choice of various basic criteria. |
| Compound Gap Criteria | O | This IE is a choice of various criteria including an ScfID. |
|
O:
Optional (Service logic dependent).
|
||
Compound Gap Criteria contains the following Information:
| Information element name | Status | Description |
|---|---|---|
| Basic Gap Criteria | M | This IE is a choice of various criteria. |
| ScfID | O | This IE contains the address of the gsmSCF which initiated the CallGapping. |
|
M:
Mandatory (The IE shall always be sent).
O:
Optional (Service logic dependent).
|
||
Basic Gap Criteria contains one of the following (Choice):
| Information element name | Status | Description |
|---|---|---|
| Called Address | O | This parameter contains a string of digits. At each call attempt, when the leading digits of the dialled number match this specific value, the call gapping treatment shall be applied to this call. |
| Service | O | This parameter contains a service key value. At each call attempt, when the service key matches this specific value, the call gapping treatment shall be applied to this call. |
| Called Address and Service | O | This parameter contains a specific string of digits and a service key value. At each call attempt, when the leading digits of the dialled number and the service key of a call match these specific values, the call gapping treatment shall be applied to this call. |
| Calling Address and Service | O | This parameter contains a specific string of digits and a service key value. At each call attempt, when the leading digits of the calling party number and the service key match these specific values, the call gapping treatment shall be applied to this call. |
|
O:
Optional (Service logic dependent).
|
||
Gap Indicators contains the following information:
| Information element name | Status | Description |
|---|---|---|
| Duration | M | Duration specifies the total time interval during which call gapping for the specified gap criteria will be active. A duration of 0 indicates that gapping is to be removed. A duration of -2 indicates a network specific duration. Other values indicate duration in seconds. |
| Interval | M | This parameter specifies the minimum time between calls being allowed through. An interval of 0 indicates that calls meeting the gap criteria are not to be rejected. An interval of -1 indicates that all calls meeting the gap criteria are to be rejected. Other values indicate interval in milliseconds. |
|
M:
Mandatory (The IE shall always be sent).
|
||
Gap Treatment contains one of the following (choice):
| Information element name | Status | Description |
|---|---|---|
| Information To Send | O | This parameter indicates an announcement or a tone to be sent to the calling party. At the end of information sending, the call shall be released. |
| Release Cause | O | If the call is to be released, this IE indicates a specific cause value to be sent in the release message. See ETSI EN 300 356-1 [20] for the coding. |
|
O:
Optional (Service logic dependent).
|
||
Information To Send contains one of the following (choice):
| Information element name | Status | Description |
|---|---|---|
| In-band Info | O | This parameter specifies the in-band information to be sent. |
| Tone | O | This parameter specifies a tone to be sent to the end-user. |
|
O:
Optional (Service logic dependent).
|
||
In-band Info contains the following information:
| Information element name | Status | Description |
|---|---|---|
| Message Id | M | This parameter indicates the message(s) to be sent, it can be one of the following. |
| Message Duration | O | This parameter indicates the maximum time duration in seconds that the message shall be played/repeated. ZERO indicates endless repetition. |
|
M:
Mandatory (The IE shall always be sent).
O:
Optional (Service logic dependent).
|
||
Message Id contains one of the following (choice):
| Information element name | Status | Description |
|---|---|---|
| Elementary Message Id | O | This parameter indicates a single announcement. |
|
O:
Optional (Service logic dependent).
|
||
4.7.1.4 Call Information Report p. 133
4.7.1.4.1 Description p. 133
This IF is used to send specific call information for a single call to the gsmSCF as requested from the gsmSCF in a previous Call Information Request.
4.7.1.4.2 Information Elements p. 133
| Information element name | Status | Description |
|---|---|---|
| Requested Information List | M | This IE specifies a list of Requested information Values which are requested. |
| Leg ID | M | This IE indicates the party in the call for which information shall be collected. |
4.7.1.5 Event Report BCSM p. 133
4.7.1.5.1 Description |R7| p. 133
This IF is used to notify the gsmSCF of a call-related event (i.e. BCSM events as answer and disconnect) previously requested by the gsmSCF in a Request Report BCSM Event IF.
4.7.1.5.2 Information Elements p. 133
| Information element name | Status | Description |
|---|---|---|
| Event type BCSM | M | This IE specifies the type of event that is reported. |
| Event Specific Information BCSM | C | This IE indicates the call related information specific to the event. |
| Leg ID | M | This IE indicates the party in the call for which the event is reported. |
| Misc Call Info | M | This IE indicates the DP type. |
If the Event Type BCSM IE contains either O_Answer or T_Answer, then the Event Specific Information BCSM IE contains the following information elements:
| Information element name | Status | Description |
|---|---|---|
| Destination address | M | This IE specifies the destination address for the call leg. The NatureOfAddress indicator may contain a national-specific value. For some national-specific NatureOfAddress indicator values the length of the digit part of destination address may be zero. |
If the Event Type BCSM IE contains one of Route_Select_Failure, O_Called_Party_Busy, O_Disconnect, T_Busy, or T_Disconnect, then the Event Specific Information BCSM IE contains the following information element:
| Information element name | Status | Description |
|---|---|---|
| Cause | C | This IE indicates the cause. |
If the Event Type BCSM IE contains O_No_Answer then the Event Specific Information BCSM IE is not included.
4.7.1.6 Initial DP p. 134
4.7.1.6.1 Description p. 134
This IF is generated by the IM-SSF when a trigger is detected at a DP in the BCSM, to request instructions from the gsmSCF.
4.7.1.6.2 Information Elements p. 135
| Information element name | IM_Orig | IM_Term | Description |
|---|---|---|---|
| Media Type Info List | M | M | This IE indicates the media types associated with the SIP call session. This IE shall contain the media description(s) received from the S-CSCF. |
| Called Party Number | C | C | This IE contains the ISDN number used to identify the called party in the forward direction.
The ISDN called party number is received from the gsmSCF due to the previous CAMEL processing or is derived from the SIP URL received from the S-CSCF for the destination address.
For all IM terminating call scenarios, at least one of the following IEs shall be present:
|
| Called Party URL | C | C | This IE contains the SIP URL used to identify the called party in the forward direction.
For all IM terminating call scenarios, at least one of the following IEs shall be present:
|
| Calling Party Number | C | C | This IE carries the ISDN calling party number to identify the calling party or the origin of the call.
For all IM originating call scenarios, at least one of the following IEs shall be present:
|
| Calling Party URL | C | C | This IE contains the SIP URL used to identify the calling party or the origin of the call.
For all IM originating call scenarios, at least one of the following IEs shall be present:
|
| Calling Party Category | C | C | Indicates the type of calling party (e.g., operator, pay phone, ordinary subscriber). |
| CallGap Encountered | C | C | This parameter indicates the type of gapping the related call has been subjected to. This parameter shall be present only if a call gapping context is applicable to the initialDP operation. |
| SIP Call ID | M | M | This IE represents a globally unique identifier for the SIP call. This IE may be used by the gsmSCF for inclusion in a network optional gsmSCF call record. This IE is received from the SIP request message from S-CSCF. |
| Cause | C | C | This IE indicates the cause specific to the armed BCSM DP event. This IE is applicable to DP Route_Select_Failure and DP T_Busy. The cause may be used by the SCF to decide about the further handling of the call. For IM Termination for an unregistered subscriber, the Cause IE shall be set to indicate Subscriber Absent. |
| Event Type BCSM | M | M | This IE indicates the armed BCSM DP event, resulting in the Initial DP IF. This IE shall be set to indicate DP T_Busy if a not reachable event is detected (e.g. IM termination to a subscriber not currently registered). |
| IMSI | M | M | This IE identifies the mobile subscriber. This IE shall contain the IMSI value received from the S-CSCF during notification of a SIP registration. |
| IP SSP Capabilities | C | C | This IE indicates which MRFC resources are supported within the IM-SSF and are available. If this IE is absent, this indicates that no MRFC is attached and available. |
| IM-SSF Address | M | M | This IE represents the E.164 address of the IM-SSF from which the InitialDP operation is sent from. |
| Original Called Party ID | C | C | This contains the ISDN number used to identify the original destination number if the call has been forwarded on route to the IM-SSF or is forwarded by the gsmSCF due to the previous CAMEL processing. |
| Original Called Party URL | C | C | This IE contains the SIP URL identifying the original destination number if the call has been forwarded on route to the IM-SSF or is forwarded by the gsmSCF due to the previous CAMEL processing. |
| Redirecting Party ID | C | C | This IE indicates the ISDN number identifying the directory number the call was redirected from. This IE shall also be sent if it was received from the gsmSCF due to the previous CAMEL processing. |
| Redirecting Party URL | C | C | This IE indicates the SIP URL identifying the directory number the call was redirected from. This IE shall also be sent if it was received from the gsmSCF due to the previous CAMEL processing. |
| Redirection Information | C | C | This IE contains forwarding related information, such as redirection reason. This IE shall also be sent if it was received from the gsmSCF due to the previous CAMEL processing. |
| Service Key | M | M | This IE indicates to the gsmSCF the requested CAMEL Service. It is used to address the required application/SLP within the gsmSCF. |
| Subscriber State | - | C | This IE indicates the status of the IMS Subscriber. The states are:
|
| Time And Timezone | M | M | This IE contains the time that the IM-SSF was triggered, and the time zone the IM-SSF resides in. |
4.7.1.7 Specialized Resource Report p. 136
4.7.1.7.1 Description p. 136
This IF is used to response to a PlayAnnouncement IF when the announcement complete indication is set.
4.7.1.7.2 Information Elements p. 136
This IF contains no information elements.
