1. Virtual Signaling Transfer Point
  2. Overview of vSTP
  3. Global Title Translation
  4. GTT Action Feature

2.4.2 GTT Action Feature

The Global Title Translation (GTT) action feature performs additional actions on the incoming/translated Message Signaling Unit (MSU) coming from the GTT. Configure GTT Action, GTT Action Set, and GTA Managed Object (MO) to use these as optional features.

vSTP supports the following types of GTT actions:

  • Discard
  • UDTS
  • TCAP Error
  • Forward
  • Duplicate
  • SFTHROT
  • SCPVAL

Discard

The Discard GTT action discards incoming MSU.

UDTS

The Unit Data Service (UDTS) GTT action marks the MSU as discarded and an error response is sent back with an udts error code.

TCAP Error

The Transaction Capabilities Application Part (TCAP) Error GTT action marks the MSU as discarded and an error response is sent back with an tcap error code.

Forward

The Forward GTT action forwards the incoming/translated MSU to a specified point code per configuration. The MSU does not forward to translated point code.

If the Forward GTT action fails, then default actions are performed per configuration:

  • Fallback means forward the MSU to translated point code
  • Discard an incoming MSU
  • Send a UDTS response with an udts error code per configuration
  • Send a TCAP error response with an tcap error code per configuration

Duplicate

The Duplicate action sends a copy of incoming/translated MSU to a specified point code per configuration. The MSU does sent to translated as well as duplicate point code.

SFTHROT

The GTT Throttle action is part of SS7 security firewall. It provides support for Egress throttling of GTT messages in vSTP. For more details, see GTT Throttle Action.

SCPVAL

The SCPVAL GTT action along with relevant parameters performs the validation on MAP parameters by comparing the SCCP and MAP digits. For more details see, GTT SCPVAL Action.