fgcom - VoIP client for the FlightGear radio infrastructure

       •  At the time of writing, there is no mechanism in place to update the frequencies used  by  FGCom  with
          the ones used in the real world, should those change. The former, thus, might not always correspond to
          the  latter. Always use the frequencies listed in FlightGear under AI -> ATCServicesinRange instead
          of the ones published on aeronautical charts.

fgcom is the FlightGear utility used for connecting to multiplayer voice servers.

       It  is  usually  not  necessary  to  run  fgcom  from  the command line, as it is already integrated into
       FlightGear, with the exception of a few specific cases (such as recording ATIS messages or  performing  a
       radio check, see the EXAMPLE section).

       Connect to the default FGCom server, switch to the San  Francisco  International  Airport  (KSFO)  ground
       frequency  (121.800MHz) and allow FlightGear to update the current pilot position by sending it to port
       16661 (the default one):

           $ fgcom--frequency=121.800--airport=KSFO

       Perform a radio check by connecting to the echo test frequency:

           $ fgcom--frequency=910.000

       Record an ATIS message on the San Francisco International Airport (KSFO) ATIS frequency (118.850MHz):

           $ fgcom--atis=118.850--airport=KSFO

fgcom exits with EXIT_SUCCESS on success, with EXIT_FAILURE if the syntax of the  command-line  arguments
       is wrong or an error occurs.

       fgcom - VoIP client for the FlightGear radio infrastructure

       FGCom understands several special frequencies used for testing purposes or general chatting:

       •  121.000MHz, 121.500MHz: "guard" frequencies reserved for emergency communications;

       •  123.450MHz, 123.500MHz, 122.750MHz: general chat frequencies;

       •  700.000MHz:  radio station frequency. Depending on the FGCom server in use, a recorded radio message
          will be played;

       •  723.340MHz: French Air Patrol communication frequency;

       •  910.000MHz: echo test frequency. Your voice will be echoed back after a short delay, to allow you  to
          check  that  your microphone, speakers/headset and that your connection to the FGCom server works. The
          test is limited to a maximum of 65 seconds, after which you will be automatically disconnected;

       •  911.000MHz: "music on hold". The frequency continuously plays background music, allowing you to check
          that your connection to the FGCom server works.

--server=server
              Connect to the FGCom server server. By default, FGCom tries to connect to fgcom.flightgear.org.

       --host=listeninghost, --port=port
              Listen  on  the  network  interface having the IP address listeninghost, on port port. By default,
              FGCom listens on the loopback interface (127.0.0.1) on port 16661.

              The specified port can be used by an instance of FlightGear to communicate with FGCom  and  update
              the pilot position as they fly.

       --callsign=callsign
              Use the callsign callsign during the session. By default, FGCom uses guest as callsign.

       --frequency=frequency
              Set  the  active radio frequency to frequency. The frequency must be written in the format xxx.xxx
              and must be given in MHz.

       --atis=frequency
              Record an ATIS message on frequency MHz. The frequency must be written in the format  xxx.xxx  and
              must be given in MHz.

       --airport=code
              Position the pilot/controller to the airport having the ICAO code code.

              Since  some  radio  frequencies  might  be  reused  across  the  world, it is essential to set the
              pilot/controller position correctly to make the FGCom server able to determine the  correct  voice
              channel. Always use this flag if you are not connecting a FlightGear instance to FGCom.

       --username=user, --password=pass
              Log in to the FGCom server using the username user and the password pass.

       --silence-threshold=threshold
              Set  the  silence  threshold  to threshold dB. The value must be between -60 and 0. The default is
              -35.0 dB.

              The silence threshold is the level below which the sound captured by the microphone is  considered
              background  noise  (and, thus, filtered out by FGCom).  Setting the silence threshold to -60 turns
              the filter off; setting it to 0 filters everything (mutes the microphone).

       --debug
              Enable debug output for troubleshooting purposes.

       --help Display usage information and exit.

       --version
              Display the FGCom version and exit.

fgfs(1), the FlightGear wiki "FGCom 3.0" page

FlightGear                                         2017-06-04                                           FGCOM(1)

fgcom       [--server=server]       [--host=listeninghost]       [--port=port]      [--callsign=callsign]
       [--frequency=frequency]   [--atis=frequency]   [--airport=code]    [--username=user]    [--password=pass]
       [--silence-threshold=threshold] [--debug] [--help] [--version]