This feature generates and sends a USSD request to an HLR, and handles the result .

Feature cheat sheet

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

HandleMobileInitiatedUssd

No

USSI

Stateless

POJO

Session Input variables

The feature reads the following fields in Session State

Session State variable name Variable type Comments
MSISDN

String

The MSISDN to use in the MAPProcessUnstructuredSS_Request operation

UssdLanguageDcsMapping

UssdLanguageDcsMapping

The Data Coding Scheme to use in the MAPProcessUnstructuredSS_Request operation

UssdTextAsBytes

byte []

The text to use in the MAPProcessUnstructuredSS_Request operation, in an encoding matching the data coding scheme.

Session Output variables

The feature sets the following fields in Session State

Session State variable name Variable type Comments
UssdLanguageDcsMapping

UssdLanguageDcsMapping

The Data Coding Scheme retrieved from the MAPProcessUnstructuredSS_Request ack (if successful).

UssdTextAsBytes

byte []

The text retrieved from the MAPProcessUnstructuredSS_Request ack (if successful), in an encoding matching the data coding scheme.

UssiErrorCode

int

The Ussi Error codes as defined in TS 24390-c60 (if unsuccessful).

UssdConversationComplete

boolean

Whether the conversation is complete and a BYE should be sent to the initiating party.

Statistics

HandleMobileInitiatedUssd statistics are tracked by the sentinel.ipsmgw SBB and can be found under the following parameter set in REM:
SLEE-Usage → sentinel.ipsmgw service → sentinel.ipsmgw SBB → feature → HandleMobileInitiatedUssd
or with rhino-stats:
"SLEE-Usage.Services.ServiceID[name=sentinel.ipsmgw,vendor=OpenCloud,version=4.0.0].SbbID[name=sentinel.ipsmgw,vendor=OpenCloud,version=4.0.0].feature.HandleMobileInitiatedUssd"

Name Description
SendProcessUnstructuredSSRequestSucceeded

Incremented when a MAPProcessUnstructuredSS_Request is sent to the HLR

SendProcessUnstructuredSSRequestFailed

Incremented when an attempt to send a MAPProcessUnstructuredSS_Request fails

ReceiveProcessUnstructuredSSRequestAck

Incremented when the feature receives a MAPProcessUnstructuredSS_Request ack

ReceiveProcessUnstructuredSSRequestError

Incremented when the feature receives a MAP error in response to the request

ReceiveUnexpectedError

Incremented when the feature receives an error that is not specifically mapped to an error code

ReceiveUnstructuredSSNotify

Incremented when the feature receives a MAPUnstructuredSSNotify_Request from the HLR

Configuration

The feature is configured with configuration scoped according to a Sentinel Selection Key. The Profile Table used to hold feature configuration is IPSMGWSharedConfigProfileTable.

The following attributes are available

Attributes Type Meaning
HlrAddress

String

Address of the HLR to request the IMSI from, used when establishing the MAP dialog if UseMsisdnAsHlrAddress is not configured

UseMsisdnAsHlrAddress

Boolean

Controls whether to address the outbound HLR leg using a GT address formed from the subscriber MSISDN, instead of using the configured HlrAddress

SentinelOriginatingAddress

String

Address of Sentinel used when establishing the MAP dialog

Using MSISDN as HLR Address

The Fetch IMSI feature can optionally address the HLR leg using a GT address formed from the inbound subscriber MSISDN, as opposed to using the destination addresses configured in the IPSMGWMapProxyConfigProfileTable profile table described above.

This behaviour can be enabled or disabled by setting the UseMsisdnAsHlrAddress attribute in the Shared Configuration Profile.

MAP Application Context

The feature uses MAP Application Context networkUnstructuredSsContext. This application context was added in GSM MAP Phase 2.

Behaviour

When the feature is triggered on a SIP invite, the feature will construct a MAPProcessUnstructuredSS_Request message from values in session state. The Handle USSI Invite and Convert USSI Text features are responsible for correctly setting the session state fields.

When the HLR responds to the message, or the TCAP connection times out, the feature will indicate (through session state) that a response to the A-Party should be generated. If the HLR sent a success response, the feature will retrieve the USSD text and data coding scheme from the result, and store those values in session state. If the HLR sent an error response appropriate to the operation, the feature will store the corresponding value in session state (and leave the text and DCS fields blank). If an unrecognized error occurs - eg a TCAP timeout, an abort, or an unrecognized MAP error - the USSI Error Code session state field will be set to 1 (and the text and DCS fields will be left blank. If the HLR attempts to send a MAPUnstructuredSSNotify_Request, to begin a multipart USSD operation, the feature will respond with a TCAP User Abort, and set the Error Code session state to 1.

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Sentinel IP-SM-GW Version 4.0.0