Description

Configuration name

Tcc Timer

Applicable contexts

SS7/SIP/Diameter service

The TccTimer configuration determines how the Sentinel-internal Tcc timer will be set when a CreditControlAnswer is received from the OCS.

Each time a CreditControlAnswer from the OCS is received by the mediation layer and subsequently passed on to the frontend layer (Diameter, SS7 or SIP service), Sentinel starts the Tcc timer which is supervising the responsiveness of the frontend/client. The duration of this timer is determined by the TccTimer configuration. It can be:

  • via a formula based on the Granted-Service-Units (GSU) AVP of the received CreditControlAnswer and configuration parameters for offsets and multipliers:

    Duration = (GsuScaleFactorMultiplier * GSU)/GsuScaleFactorDivisor + GsuOffset

  • calculated via a formula based in a similar way on the Validity-Time (VT) AVP:

    Duration = (VtScaleFactorMultiplier * VT)/VtScaleFactorDivisor + VtOffset

  • switched off completely

  • set to a constant value.

Configuration

The TccTimer configuration includes:

Parameters Value Description

DefaultTccTimeout

Long

The timer duration if USE_DEFAULT_TIMEOUT is set

TccOption

String

one of NO_TCC, USE_DEFAULT_TIMEOUT, USE_VT, USE_GSU. Determines what option shall be used to calculate the Tcc timer duration.

GsuScaleFactorMultiplier

Integer

Used when tccOption is set to USE_GSU.

GsuScaleFactorDivisor

Integer

Used when tccOption is set to USE_GSU.

GsuOffset

Integer

Used when tccOption is set to USE_GSU.

VtScaleFactorMultiplier

Integer

Used when tccOption is set to USE_VT.

VtScaleFactorDivisor

Integer

Used when tccOption is set to USE_VT.

VtOffset

Integer

Used when tccOption is set to USE_VT.

TccMinValue

Long

The outcome of any of the Tcc calculation options above is capped at this value; in other words, the Tcc timer duration cannot fall below this threshold value.

Note The Tcc Timer is armed redundantly if the session is replicated.

Configuration profile naming

Configuration Profile Table Name Description Profile Naming

TccTimerConfigurationTable

TccTimer configuration

SentinelSelectionKey (for example, OpenCloud::::)

Provisioning interfaces

The configuration can be provisioned using the Sentinel machine provisioning API.

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Sentinel Express Version 2.9.0