scope:

This ETS specifies Packet mode Data Network (PDN) gateways for TETRA Switching and Management Infrastructures (SwMI). The circuit mode data services and Internet Protocol (IP) issues are outside the scope of this ETS. The information exchange about address mapping between the TETRA air interface address and any external data network address due to migration between TETRA SwMIs is outside the scope of this gateway standard. The gateway functions are defined as required by the used upper network layer protocol and are outside the scope of this standard.