robocall

Robocall is a web service to make a phone call to deliver a pre-recorded messages from AMR robot. Also, the call will deliver a password code (defined by the "pw" parameter in the request URI) Callee must anwser the call and press a "0" to confirm, or the caller will redial for several times.

Dependancy

• Asterisk installation Please follow the procedure to install asterisk server & dahdi driver.

http://draalin.com/installing-asterisk-in-ubuntu/

https://www.digium.com/sites/digium/files/digium-telephony-card-quickstart-installation-guide.pdf

https://www.digium.com/sites/digium/files/analog-telephony-card-4-port-user-manual.pdf

• cp the extensions.conf to /etc/asterisk/extensions.conf

• config /etc/asterisk/sip.conf // NO needed

    [general]
    context=default
    
    [6001]
    type=friend
    context=from-internal
    host=dynamic
    secret=unsecurepassword
    disallow=all
    allow=ulaw
  

• config /etc/dahdi/system.conf

  fxsks=1
  echocanceller=mg2,1
  fxsks=2
  echocanceller=mg2,2
  fxsks=3
  echocanceller=mg2,3
  fxsks=4
  echocanceller=mg2,4
  
  # Global data
  
  loadzone        = us
  defaultzone     = us
  

• config /etc/asterisk/chan_dahdi.conf

  ....
  [channels]
  #include /etc/asterisk/dahdi-channels.conf
  ....
  

• config /etc/asterisk/dahdi-channels.conf

  ;;; line="1 WCTDM/0/0 FXSKS  (EC: VPMOCT032 - INACTIVE)"
  signalling=fxs_ks
  callerid=asreceived
  group=0
  context=from-internal
  channel => 1
  callerid=
  group=
  context=default
  

Start the robocall_server

    $ sudo python ./robocall_server.py

or add following line in startup script /etc/rc.local

    /usr/bin/python /home/advrobot/robocall/robocall_server.py

Making a call request from any web client

    http://192.168.30.222:8080/robocall?roomId=15&pw=1234
    
    //pw = password to prompt to the user
    //roomId = room id to call

Response

• Status: Completed // 有接通 且有按 0
• Status: Expired   // 沒接通 或是沒按 0
• Status: Invalid roomId   // 無效的房號

Convert wav file to gsm file

• wav file must be in 16 bit 8000 Hz stereo

    $ sox file1.wav -r 8000 -c 1 -s file1.gsm -q
  

• copy gsm files to /home/advrobot/robocall/sounds/

Reference

• https://www.lessons4you.info/how-to-originate-call-from-asterisk-cli/

• https://www.voip-info.org/wiki/view/Asterisk+cmd+Originate+Chinese

    (譯者註:originate的用途是向客戶端發起呼叫，將客戶端引入到Dialplan中，並從exten的首項開始執行，進行一系列操作。雖然客戶端是被動接受，但此過程相當於主動撥入的過程。CLI> channel originate DAHDI/1/0123456789 extension 123@from-pstn  會從 DAHDI/1 界面撥號0123456789, 相當於外面有人播入到 dialplan 123)
  

• https://www.digium.com/sites/digium/files/analog-telephony-card-4-port-user-manual.pdf

• https://www.voip-info.org/wiki/view/Asterisk+auto-dial+out