Plain-language definition
SS7 carried over IP networks.
Technical definition
SIGTRAN defines SCTP transport and adaptation layers (M2PA, M2UA, M3UA, SUA) that carry SS7 user parts over IP, removing the need for TDM signaling hardware.
Why it matters
SIGTRAN is what makes software-only SMSCs, STPs and firewalls possible on commodity servers.
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.