Siemens S7-1200 Operating Instructions Manual page 26

Application and properties
1.6 Configuration examples
TeleService with TeleService gateway (via the Internet)
The connection between the engineering station and S7 station is via the TeleService
gateway.
The engineering station is connected to the TeleService gateway via the Internet.
Figure 1-6
26
TeleService via the mobile wireless network with TeleService gateway - connection via
the Internet
Operating Instructions, 01/2015, C79000-G8976-C381-01
CP 1243-7 LTE