Description

Feature name

DetermineChargeableLeg

Applicable contexts

SIP service

SAS Support

No

Prerequisite Features

DetermineCallType

The Determine Chargeable Leg feature determines the chargeable leg of a call based on the call type. This information is then used to set a session state field which can be used by other VoLTE features that need to do charging-related activities.

By default the feature runs directly after the Determine Call Type feature.

Session input and output variables

Session input variables

Session state variable name Variable type 
CallType

Enum

Session output variables

Session state variable name Variable type Comments 
LegForCdrs

String

The leg that will be used for the interim CDR logic

Error scenarios

Scenario Handling

Call type not set in session state

Report featureFailedToExecute

Unable to access leg manager or incoming leg

Report featureFailedToExecute

Chargeable Leg

  • If the call type is "Mobile Originating" then the LegForCdrs session state field will get set to the name of the calling party leg, if it exists.

  • If the call type is "Mobile Terminating" then the LegForCdrs session state field will get set to the name of the leg linked to the calling party leg, if it exists.

  • If the call type is anything else then the session state field will not get changed.

Feature responses

Response Reason

featureFailedToExecute

Chargeable leg could not be determined

featureHasFinished

feature has finished

Configuration

Determine Chargeable Leg cannot be configured.

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