tristan@test:~/tmp$ linphonec
Ready
Warning: video is disabled in linphonec, use -V or -C or -D to enable.
linphonec> help
Commands are:
---------------------------
      help      Print commands help.
    answer      Answer a call
autoanswer      Show/set auto-answer mode
      call      Call a SIP uri or number
     calls      Show all the current calls with their id and status.
 call-logs      Calls history
    camera      Send camera output for current call.
      chat      Chat with a SIP uri
conference      Create and manage an audio conference.
  duration      Print duration in seconds of the last call.
  firewall      Set firewall policy
    friend      Manage friends
      ipv6      Use IPV6
      mute      Mute microphone and suspend voice transmission.
       nat      Set nat address
     pause      pause a call
      play      play a wav file
playbackga      Adjust playback gain.
     proxy      Manage proxies
    record      record to a wav file
    resume      resume a call
 soundcard      Manage soundcards
      stun      Set stun server address
 terminate      Terminate a call
  transfer      Transfer a call to a specified destination.
    unmute      Unmute microphone and resume voice transmission.
    webcam      Manage webcams
      quit      Exit linphonec
---------------------------
Type 'help <command>' for more details or
     'help advanced' to list additional commands.
linphonec> 2020-04-07 15:04:54:505 ortp-error-LinphoneCore has video disabled for both capture and display, but video policy is to start the call with video. This is a possible mis-use of the API. In this case, video is disabled in default LinphoneCallParams
sip:zotzbro@sip.linphone.org is contacting you.
linphonec> Receiving new incoming call from sip:zotzbro@sip.linphone.org, assigned id 1
answer
Segmentation fault (core dumped)