Tip This feature is for CDMA networks.

The CDMAFetchTLDN feature retrieves the TLDN (Temporary Local Directory Number) from the HLR. The CDMAFetchTLDN derives the Circuit Switched Routing Number (CSRN) from the TLDN and stores the CSRN in session state.

Feature Cheat Sheet

B2BUA Instance Originating / Terminating Point(s) in Session Plan Network Operator Data Subscriber Data Stateful or Stateless POJO Feature or SBB Feature Other notes

SCC

Terminating

SipAccess_SessionCheck

Yes

No

Stateless

POJO

Session input variables

Variable name Type Comments 
RegistrationRecords

List<RegistrationRecord>

The list of registration records for the subscriber, used to find the subscriber’s identity.

 
Subscriber

String

Used to obtain the subscriber’s identity if it could not be determined from the registration data.

 
FetchedTLDN

boolean

True, if the TLDN has been fetched successfully.

 
RoutingMode

TADSRoutingMode (Enum)

Determines whether CS and/or PS routing is enabled and the preferred attempt order.

 
TADSCurrentLegType

LegType (Enum)

One of NONE, CS or PS

 
LastRequestSendTime

Long

The last time a request was sent for the TLDN, or null if a request has not been made.

 
SentinelSelectionKey

SentinelSelectionKey

Used to retrieve configuration data for the feature.

 
Subscriber

String

Used to obtain the subscriber’s identity if it could not be determined from the registration data.

Session output variables

Variable name Type Comments 
CSRN

String

The CSRN of the served user, if the feature could derive it.

 
HasCSRN

boolean

Indicates whether the CSRN session state field has been populated.

 
FetchedTLDN

boolean

Indicates whether the TLDN was fetched successfully.

 
LastRequestSendTime

Long

The last time a request was made for the TLDN.
Note The CSRN is the TLDN, with an optional prefix (defined in feature configuration)

Network Operator Data

The CDMAFetchTLDN feature depends on network operator data in two configuration profile tables. One is for feature specific configuration, the other is for general HLR connection configuration.

Feature Configuration

Feature specific configuration is set in a profile table called: SCCCDMAFetchTLDNConfigProfileTable. Profiles are scoped on Sentinel Selection Key.

SCCCDMAFetchTLDNConfigProfileTable

Attribute Type Default Value Meaning 
ForceSipUserEqualsPhone

boolean

 
false

If true, when attempting to extract a number from a SIP URI, the feature will extract a number even if the URI does not have the user=phone parameter.

 
CSRNPrefix

String

 
null

The (optional) prefix to be added to the TLDN to form the CSRN

 
SubscriberTypeOfDigits

String

 
DIALED_OR_CALLED_PARTY_NUMBER

The type of digits field of the subscriber 'DigitsType' included in the LOCREQ.

 
SubscriberNatureOfNumber

String

 
INTERNATIONAL

The nature field of the subscriber 'DigitsType' included in the LOCREQ.

 
SubscriberNumberingPlan

String

 
TELEPHONY

The numbering plan field of the subscriber 'DigitsType' included in the LOCREQ.

HLR Connection Configuration

The CDMAFetchTLDN feature uses the HLR configuration in a profile table called: CDMAHLRConfigProfileTable. Profiles are scoped on Sentinel Selection Key.

CDMAHLRConfigProfileTable

Attribute Type Default Value Meaning 
HLRSccpAddressAsString

String

 
type=A7,ri=pcssn,pc=1-1-1,ssn=101,national=true

SCCP Address of the HLR, used when establishing the MAP dialog

 
SentinelSccpAddressAsString

String

 
type=A7,ri=pcssn,pc=1-1-2,ssn=102,national=true

SCCP Address of Sentinel, used when establishing the MAP dialog

 
HLRInvokeTimeout

long

 
4000

The timeout (ms) for waiting the HLR response. Used in the TCAP layer for the invoke timeout.

 
MarketID

int

 
1

The value of the market id field in the MSCID used in the LOCREQ.

 
SwitchNumber

int

 
1

The value of the switch number field in the MSCID used in the LOCREQ.
Note See: SCCP Address Format to understand the String format of SCCP addresses.

Statistics

CDMAFetchTLDN statistics are tracked by the sentinel.volte.sip SBB and can be found under the following parameter set:
SLEE-Usage → [sentinel.volte.sip service name] → [sentinel.volte.sip SBB name] → feature.CDMAFetchTLDN

Parameter Type Description 
RequestSent

Counter

Incremented when a request is sent to the HLR.

 
FailedToSendRequest

Counter

Incremented when a request failed to be sent to the HLR.

 
RequestFailed

Counter

Incremented when a TLDN is not received from the HLR.

 
CSRNNotDetermined

Counter

Incremented if the CSRN could not be derived.

 
CSRNDetermined

Counter

Incremented when the CSRN is derived.

 
UnableToDetermineSubscriber

Counter

Incremented when it was not possible to determine an address for the subscriber.

 
ResponseLatency

Sampled

Records elapsed time between sending the request to the HLR and getting a response (in milliseconds).

Behaviour

The feature issues a query to the HLR for the TLDN using the MAP operation Location Request. The CDMA Application Context used is allOperationsAC.

When building the request to the HLR, the feature retrieves the "digits" portion of the IMS default public ID of the Served user from the first entry in the RegistrationRecords session state field. If this field does not contain digits, the "digits" portion of the subscriber ID is used.

Note that the feature does not use the entire ID, only the digits portion. Specifically, the feature will use the numbers in a Tel URI, or the user part of a SIP URI that has the 'user=phone' parameter if ForceSipUserEqualsPhone is false, or the user part of a SIP URI without the 'user=phone' parameter if ForceSipUserEqualsPhone is true.

The HLR may return either a failure response, or a LocationRequest-Res response containing the TLDN as a PSTNTermination element in the field TerminationList. If there is no valid element in the TerminationList field, the feature will also check the top level digits field for any TLDNs marked as ROUTING_NUMBER.

If a TLDN is returned, the CDMAFetchTLDN feature sets the CSRN session state field.

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Sentinel VoLTE Version 3.1.0