Plain-language definition
Sending SS7 messages with a false originating address.
Technical definition
GT spoofing forges the SCCP calling-party Global Title to impersonate a trusted operator or SMSC, evading GT-based screening and misattributing traffic.
Why it matters
GT validation, abnormal-GT behaviour detection and correlation with SRI-SM results are how firewalls expose spoofed origins.
Last reviewed 2026-09-12 by the Guardivia QoS Engineering Team. Product facts on this page describe current capabilities; items marked “where supported”, “optional”, “integration” or “consultancy” are confirmed per deployment.