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. |
|
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, |
Provisioning interfaces
The configuration can be provisioned using the Sentinel machine provisioning API.
