1. Virtual Signaling Transfer Point
  2. Overview of vSTP
  3. Global Title Translation
  4. MTP Based GTT with Screening Action
  5. MTP Based GTT Feature Configuration

2.4.3.1 MTP Based GTT Feature Configuration

The MTP based GTT with Screening Action is performed if the service handling results in Fall through to GTT or if GTT Required option is ON for Service Relayed MSU.

The following system-wide options are used to configure this functionality:

  • MTP Routed GTT

    The MTP Routed GTT (mtprgtt) option is used for MTP Routed GTT functionality as follows:

    • If option = OFF, then GTT shall not be performed on MTP Routed MSUs.

    • If option = Use MTP Point codes, then GTT shall be performed on MTP Routed MSU, SCCP Portion shall be updated based on translation entry but MSU shall be sent to Original DPC (and not to translated DPC).

    • If option = Full GTT, then GTT shall be performed on MTP Routed MSU, SCCP Portion as well as MTP Portion shall be updated based on translation results.

  • MTP Routed GTT fallback
    The MTP Routed GTT fallback (mtprgttfallbk) option is used for error handling to be performed in case of GTT failure for MTP routed MSUs. It has the following values:

    • If option = GTT failure, then MSU will be discarded with appropriate UIM. UDTS will be sent to originator and measurements shall be pegged as done for GT routed messages.

    • If option = Fall back to MTP routing, then MSU (with translation/modification/routing data from UDR-related service) shall be MTP routed.

The support for the following features is required for the functionality of MTP based GTT:

  • SCCP Stop Action: provide a means for the operator to specify SCCP Stop Action in the MTP Screening Rules, to allow the MTP processing to fall through to GTT on non-discarded MSUs.

  • XLAT = NONE: provide a means for the operator to specify GTT Translation Type = NONE.

  • •

    GTT SET = DPC: A new GTT set, DPC (with set type dpc) shall be supported. The provisioning and behavior of the DPC Translations shall be same as OPC Translations. However, DPC GTT set cannot be used as secondary optional set (i.e. DPC GTT set cannot be assigned to OPCSN parameter in translation entry). The DPC GTT set type can be searched only when the GTT hierarchy is FLOBR specific.