From your handset, there are three ways you can reach your destination number. They are:
1. Satellite phone handset to another satellite phone handset;
2. satellite phone handset to a cellular phone handset, through cellular network, and
3. satellite phone handset to a landline served phone connected to PSTN.
1. Satellite phone to satellite phone
This type of call ensures security because the call is never routed through a Landline, or, PSTN – Public Switched Telephone Network, or, for that matter, through cell-network. Let us see graphically how it works:
When you dialed your satellite phone handset the signal is beamed to the satellite from where it is redirected to the Earth-station. The Earth station, then, encodes and sends it back to the satellite which inturn, sends the symbol to the destination hand-set.
2. Satellite phone to cellular phone served through a cellular network
Here the call is routed through a cellular network. Let us see, graphically, how it works:
When you dialed your satellite phone handset, the signal is beamed to the satellite from where it is beamed back to the Gateway from where the cellular network’s, MTSO -Mobile Telephone switching office, which controls all the cell sites, and, by extension, all cell phones coming under its ambit, sends the signal to the appropriate cell-phone.
3. Satellite phone handset to land line connected phone set
Here the call is routed through a PSTN. Let us see, graphically, how it works:
As seen as your dialed your handset, the signal is beamed to the nearby Geo-stationery satellite, which, then, transfers the signal to the nearest LES – Land Earth Station. Land Earth station connects the call to the PSTN – Public Switched Telephone Network, which, in turn, sends the signal to the appropriate destination handset.