Description

Feature script name

IPSMGWIECFeature

Applicable contexts

SIP service

Prerequisite features

PS Delivery or CS Delivery or MO Submission

Feature execution points

SipAccess_ChargingAbort SipAccess_CreditAllocatedPostCC SipAccess_CreditLimitReachedPostCC SipAccess_ControlNotRequiredPostCC SipAccess_ServiceTimer SipInstructionExecutionFailure SipThirdPartyAccess_SubscriberCheck SipThirdPartyAccess_PartyRequest SipThirdPartyAccess_PartyResponse SipTransaction_SubscriberCheck SipTransaction_Request SipTransaction_PartyResponse

The IPSMGW IEC feature covers immediate event charging using a charge/refund model. The feature is responsible for:

  • creating the reservation charging instance (IPSMGWChargingFeatureUtil.DEFAULT_IEC_CHARGING_INSTANCE) and default session counter on a pending delivery.

  • instructing the charging manager to send a direct debit to the OCS

  • detection of message nondelivery conditions and refunding as necessary

The general use case is that an SMS will be delivered by one of IPSMGW’s delivery or submission features. On the incoming MO SIP MESSAGE, or MT-FSM DialogTcapMessage, the IEC feature will trigger a direct debit, suspending the outgoing message until a charging response is received, before allowing the message to be sent. If a response to the message is received which indicates failure, a refund will be issued, unless a fallback is attempted that also has charging enabled.

For a high level overview of Sentinel charging see Sentinel SIP Charging Architecture

Note

Currently, IPSMGW only supports one charging instance per Sentinel session, though this instance may have multiple session counters.
Tip All of IPSMGW’s charging features make use of Sentinel’s comprehensive charging API.

Feature cheat sheet

Feature Name Network Operator Data Used in PlanId(s) Stateful or Stateless POJO Feature or SBB Feature

IPSMGWIECFeature

No

MTFSM_PS,MTFSM_CS,MTFSM_CS_PS,MTFSM_PS_CS

Stateless

SBB

Session state inputs and outputs

Inputs

Name Format Description Behaviour if null/invalid

SentinelSelectionKey
com.opencloud.sentinel.common.SentinelSelectionKey

selection key (for example, <platform_operator>:::: )

For selecting mappers

Increment InputParameterErrors Common cleanup actions

SentinelIPSMGWAddress
com.opencloud.slee.resources.in.datatypes.cc.AddressString

MAP-CommonDataTypes.AddressString

The value that the feature will use as the MSC-address in outgoing messages. Written to SessionState for retrieval by charging mappers.

N/A

IPSMGWChargingCounterAddress
com.opencloud.sentinel.charging.sessioncounters.SessionCounterAddress

key/value pairs identifying the session charged service

Determines which counter the feature will update with charging data (the IEC feature only treats one counter as the immediate charging counter at a time). Also see Outputs.

No-op unless initial request

LatestOcsAnswer
org.jainslee.resources.diameter.ro.types.vcb0.CreditControlAnswer

Last received CCA

Passed through to a charging mapper to generate the session counter values

Exception thrown, if the feature is expecting a response from the OCS. Otherwise ignored.

PSDeliveryStatus
com.opencloud.sentinel.ipsmgw.sessionstate.mt.PSDeliveryStatus

NOT_ATTEMPTED/FAILED/SUCCEEDED

Outcome of last PS Delivery attempt

N/A

CSDeliveryFailed

boolean

Whether the CS Delivery feature delivery attempt failed

N/A

MoSubmissionFailed

boolean

Whether the MOSubmission feature delivery attempt failed

N/A

PSDeliveryTimerID
javax.slee.facilities.TimerID

The ID of the PS Delivery timer

Used in determining whether to do a refund after a delivery failure

Timer event is ignored

IECChargingInstructed

boolean

Whether there has already been a charging instruction in this session

N/A

IECRefundInstructed

boolean

Whether there has already been a refund instruction in this session

N/A

LatestClientRequest
org.jainslee.resources.diameter.ro.types.vcb0.CreditControlRequest

Credit-Control-Request

Determine whether an incoming CCA is a direct debit

N/A

Outputs

Name Format Description

IPSMGWChargingCounterAddress
com.opencloud.sentinel.charging.sessioncounters.SessionCounterAddress

key/value pairs identifying the session charged service

Mapped from initial incoming chargeable event request in SIP initiated sessions to determine the default session counter against which the units will be charged.

UserSessionId

String

The MT SIP session ID

InboundSipRequest
org.jainslee.resources.sip.SipRequest

The incoming SIP request in MO deliveries

Used to extract information for use in a CCR

InboundDialogTcapMessage
com.opencloud.sentinel.ipsmgw.eventmanager.tcapmessage.DialogTcapMessage

The incoming TCAP message in MT deliveries

Used to extract information for use in a CCR

IECChargingInstructed

boolean

Set after a DIRECT_DEBIT CCR has been sent to the OCS

IECRefundInstructed

boolean

Set after a REFUND_ACCOUNT CCR has been sent to the OCS

Charging API interactions

The charging API interactions fall under the following categories:

  • charging instructions issued on the IPSMGWChargingFeatureUtil.DEFAULT_IEC_CHARGING_INSTANCE itself

  • updates made to all counters on the charging instance, mainly limited to updates from CCAs.

  • complete implementation of event based charging on the default counter.

Interaction with the default charging instance

Initialisation

When the feature is first triggered on an incoming message, if there is a delivery message pending, it creates the default IEC charging instance, under the name IPSMGWChargingFeatureUtil.IPSMGW_IEC_CHARGING_INSTANCE. It then maps the request to a session counter address written to the session state field IPSMGWChargingCounterAddress. This is the default session counter on which all subsequent IEC based charging is performed.

Initial debit

On any trigger other than an incoming message request, the feature checks whether the IPSMGWChargingFeatureUtil.DEFAULT_IEC_CHARGING_INSTANCE has been initialised. The first step is to check the instance exists in the ChargingManager, then that the instance has a session counter with the address specified in session state IPSMGWChargingCounterAddress. If either check fails, the feature ends immediately on the assumption that IEC is not enabled.

The feature will instruct the charging instance to send a direct debit message to the OCS. It will suspend the outgoing delivery leg until the OCS authorises the request.

The Ro Credit-Control-Request is generated using the IPSMGWChargingInstanceToCCR mapper.

Refund

If the feature is triggered on a non-success response to a chargeable event, and no fallback attempts are left, the feature will instruct the charging instance to refund the amount that was initially debited.

Interaction with all session counters

When a CCA is received, all counters on the ChargingInstance will be processed according to the algorithm outlined in Counter update algorithm pseudo code. The feature will clear the pending requested units on all session counters.

When charging using a non-default counter, another feature will need to set reported used and pending requested units on the counters as needed.

Interaction with the default session counter

The default IEC session counter is fully managed by the IEC feature. Generally speaking, user features need not interact directly with this counter.

Mappers

This feature relies on two mappers:

  • The first converts the initial message to a SessionCounterAddress.
    The default implementations are MTFSMToSessionCounterAddress and `SipRequestToSessionCounterAddress`SipRequestToSessionCounterAddress:

    // a mapper that takes a DialogTcapMessage or SipRequest and generates a SessionCounterAddress.
final Mapper<SentinelSipSessionState> mapper = getMapperLibrary().findMapper(
        getSessionState().getSentinelSelectionKey(),
        argClass,
        SessionCounterAddress.class,
        mappingPoint);

  • The second mapper converts a CCA into a list of session counters.
    The default implementation is CCAtoSessionCounterList:

    // a mapper that takes a CreditControlAnswer and generates a List<SessionCounter>.
final Mapper<SentinelSipSessionState> mapper = getMapperLibrary().findMapper(
        getSessionState().getSentinelSelectionKey(),
        CreditControlAnswer.class,
        List.class
        mappingPoint);

Feature responses

Response Reason

featureHasFinished

feature has finished
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Sentinel IP-SM-GW Version 4.1