MTP Routed Global Title Translation

In previous releases, MTP routed SCCP messages are routed to the service module if either the MTP Msgs for SCCP Apps feature, part number 893017401, is enabled and turned on, or the MSU is screened by the Gateway Screening stop action SCCP. These actions were performed on the service modules

1. EPAP service handling is performed.
2. If the EPAP service handling resulted in Fall through to MTP routing, then MTP Routed GSM MAP Screening is performed, if applicable.
3. The MSU is MTP routed if the message is not discarded by MTP Routed GSM MAP Screening.

In addition to the actions that were performed in previous releases, global title translation and GTT Actions are performed on MTP routed MSUs similar to the existing global title translation GTT handling for GT routed MSU’s. Global title translation on MTP routed MSUs is performed if the service handling results in Fall through to GTT or if the GTT required option in the service selector is set to on for the service relayed MSU.

Two parameters have been added to the chg-sccpopts command to determine how MTP routed MSUs are handled. The first parameter is mtprgtt which specifies whether global title translation is performed on an MTP routed MSU and the routing that is performed on the MSU after global title translation is performed. The mtprgtt parameter is contains these values.

• off - global title translation is not performed on the MTP routed MSU.
• usemtppc - global title translation is performed on the MTP routed MSUs and the MSU is sent to the original DPC.
• fullgtt - global title translation is performed on the MTP routed MSU and the MSU is sent to the translated DPC.

The second parameter is mtprgttfallbk which specifies whether an MTP routed MSU is MTP routed after the failure of the global title translation process.

• mtproute - perform MTP routing on the MSU if a failure occurs during the global title translation process.
• gttfail - discard the MSU if a failure occurs during the global title translation process. Send a UDTS message if required.