This feature creates the cassandra entries for external session tracking before the call is answered .

Feature cheat sheet

B2BUA Instance Originating / Terminating Point in Session Plan Network Operator Data Subscriber Data Stateful or Stateless POJO Feature or SBB Feature

Any and All

Originating and Terminating

SCC_Post_SipAccess_PartyResponse

No

No

Stateless

POJO

Session input variables

Session State variable name Variable type Comments

ExternalSessionTrackingActive

boolean

Set by SCCDetermineExternalSessionTracking. If this is not true the feature will not execute

ExternalSessionTrackingKeys

Set<String>

The list of tracking keys to save the current session against

Session output variables

Session State variable name Variable type Comments

PreAlertingLegs

Set<String>

A list of legs that are in the Pre-Alerting state

AlertingLegs

Set<String>

A list of legs that are in the Alerting state

Statistics

TrackSessionPreAnswer statistics are tracked by the volte.sentinel.sip SBB and can be found under the following parameter set in REM:
SLEE-Usage → volte.sentinel.sip service → volte.sentinel.sip SBB → feature → TrackSessionPreAnswer
or with rhino-stats:
"SLEE-Usage.Services.ServiceID[name=volte.sentinel.sip,vendor=OpenCloud,version=2.7.0].SbbID[name=volte.sentinel.sip,vendor=OpenCloud,version=2.7.0].feature.TrackSessionPreAnswer"

Name Description
Started

Incremented each time the feature runs

FailedToStart

Incremented when a fatal error occurs before feature execution

IssuedWarning

Incremented when a non-fatal error occurs during feature execution

FailedDuringExecution

Incremented when a fatal error occurs during feature execution

TimedOut

Incremented when feature execution does not complete within a reasonable time frame

AddedTrackedDialog

Incremented when the feature adds a TrackedDialog insert statement to the cassandra batch query

AddedTrackedDialogKeys

Incremented when the feature adds a TrackedDialogKeys insert statement to the cassandra batch query

SentQueryToCassandra

Incremented when the feature executes an asynchronous query to cassandra

CassandraSuccess

Incremented when the feature receives a cassandra success result

CassandraError

Incremented when the feature receives a cassandra error result

CassandraTimeout

Incremented when the feature receives a cassandra timeout result

SavedDialogStatePartialDialog

Incremented when the feature receives the initial INVITE, and the partial dialog-ID is written to Cassandra

SavedDialogStatePreAlerting

Incremented when the feature receives a dialog-creating non-180 provisional response, and updates Cassandra

SavedDialogStateAlerting

Incremented when the feature receives the first 180 Ringing response, and updates Cassandra

SavedDialogStateActiveAwaitingAck

Incremented when the feature receives the 2xx response to the initial INVITE, and updates Cassandra

DeletedPartialDialog

Incremented when the full dialog-ID is known and the partial dialog entry is deleted from Cassandra

CassandraAsyncQueryTimeSuccess

Samples the elapsed time between starting a query and a success response arriving from Cassandra

CassandraAsyncQueryTimeFailure

Samples the elapsed time between starting a query and a failure response arriving from Cassandra

Behaviour

This feature runs on 18x responses to the initial INVITE, it saves information about the current session to the cassandra database. It writes the following:

Name Type Comments

Established Dialog Id

String

A normalised string that identifies the current session, in the form of '<call-id>;local-tag=<to-tag>;remote-tag=<from-tag>' for Originating calls, and '<call-id>;local-tag=<from-tag>;remote-tag=<to-tag>' for Terminating calls

State

DialogState (enum)

The current state of the session. Values are PreAlerting or Alerting

AS URI

String

The URI of the serving AS

Associated Dialog Id

String

A normalised sting that identifies the associated dialog for the current session, in the form of '<call-id>;local-tag=<from-tag>;remote-tag=<to-tag>' for Originating calls, and '<call-id>;local-tag=<to-tag>;remote-tag=<from-tag>' for Terminating calls

Tracking Keys

Set<String>

The set of tracking keys to save against the current session

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Sentinel VoLTE Version 2.7.0