The STODDetermineTargetSession feature Reads STOD tracking information out of a database and sets it into the session state for processing by External Session Tracking features. .

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

Stod

Originating

Stod_SipAccess_SessionStart

Yes

Yes - subscriber data is from the HSS

Statefull

SBB Feature

Requires other features in STOD to work

Service Description

The STODDetermineTargetSession feature uses the session tracking information stored in an CQL database to set a session state field. The session state field is used in other features to get the ACI of the session that was tracked.

Prerequisites

Session Input Variables

Session State variable name Type Comments
CallType

Complex

The calltype

RequestIsForMmtelTransfer

boolean

Get request is for MMtel transfer

MMTelDetermineTransferableSetQueryTime

long

The query time

MMTelIsNewCassandraSession

boolean

Is the session a new Cassandra session

SessionTrackingCassandraSessionACI

Complex

get the ACI for session tracking

ASURI

String

Insert the application server Uri into the session state

Session Output Variables

Session State variable name Type Comments
MMTelDetermineTransferableSetQueryTime

long

Set the time for the initial invocation

MMTelIsNewCassandraSession

boolean

Is it a new Cassandra session

MMTelSessionToTransfer

Complex

Insert the session tracking information into the Session State

MMTelAccessTransferIsLocal

boolean

Set whether the access transfer is local

Statistics

Name

Incremented when…​

StodDetTargetSessionInvoked

The feature has started

StodCassandraTimeout

The query result event has been received however the result is an error and the error is a time-out

StodCassandraError

The query result event has been received however the result is an error

StodSampleCassandraAsyncQueryTimeFailure

The query result event has been received however the result is an error

StodCassandraSuccess

The query result event has been received with a non error result

StodSampleCassandraAsyncQueryTimeSuccess

The query result event has been received with a non error result

StodCassandraQueried

The Cassandra query has been sent

StodCassandraNoDataFound

The results of the Cassandra query showed that there was no session in the database for session transfer

StodFoundTrackedSession

The session to transfer has been found in a database

StodSavedSessionToTransfer

The session to transfer returned non null and has been set into a session state variable

Behaviour

When the feature is invoked, We determine whether the invocation was for a transfer attempt or the response to a transfer attempt. In the event that the trigger was a transfer attempt then there is an asynchronous query to the Cassandra database for the tracked session information. Otherwise if the trigger was for the result of a Cassandra query we process it and exit. If an existing session is found for the served user, the target session is set to that dialog. If not the feature answers with a Sip Response 404 Not Found.

Source

For source code information see MMTel Session Transfer Source Code.

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