Indusic Smart Private Trunking (iSPT) is an intelligent management system independently developed by Indigo Microelectronics that integrates digital voice, narrowband data, text messaging, satellite positioning, and a unified dispatching platform.

The iSPT system differs from conventional digital trunking systems. It is a "virtual trunking" function implemented by Indigo Microelectronics based on the standard DMR conventional mode through proprietary protocols and software control. It serves as a complement to conventional DMR trunking systems, enabling low-cost, small-scenario, and personalized trunking dispatching systems through manufacturer and user-defined protocols.