IVRS

ಕನ್ನಡದಲ್ಲಿ ನೋಡಿ

About
IVRS(Interactive Voice Response System) is commonly used platform to reach people connected through mobile/telephones. This page is about how one can set it up and send Voice SMS at any place with minimal requirements.

Installation and Deployment
This page helps anyone to deploy IVRS to send voice SMS from your Kalpavriksha(Ubuntu) machine with a data card. Call charges as per network would apply. Below instructions were modified from Mojolab site where this was used to install Swara software. This was tested on Kalpavriksha(Ubuntu) with Huwawei E173 and is currently used in Government High School, Domlur. An opensource IVRS program called Asterisk is used to run Swara software.

Make sure each step below is successful without errors: --

Step 1: Install ssh, lamp and other required packages sudo apt-get install openssh-client openssh-server sudo apt-get install tasksel sudo tasksel install lamp-server sudo apt-get install ncurses-dev libxml2-dev g++ sudo apt-get install lame mysql-server wget gcc g++ bison zlib1g zlib-bin openssl php5-mysql php5 apache2 python-mysqldb

Step 2: Enter superuser mode and run below commands to install python packages required for asterisk. su -  apt-get install python-setuptools easy_install MySQL-Python easy_install tweepy easy_install oauth2 easy_install stopwatch easy_install simplejson

Step 3: Disabling your firewall sudo ufw disable

Step 4: Installing asterisk. Note install only this version of asterisk in this way only. Go to http://downloads.asterisk.org/pub/telephony/asterisk/old-releases/ link and download asterisk-1.6.2.23.tar.gz file. Run below commands to install it cd /usr/src sudo tar -xvzf ~/Downloads/asterisk-1.6.2.23.tar.gz sudo apt-get install ncurses-dev libxml2-dev g++ cd asterisk-1.6.2.23 sudo ./configure sudo make clean sudo make sudo make install sudo make samples

Step 5: Create new database for swara in mysql /usr/bin/mysql_secure_installation (Answer yes to every question, set a new password for the root user) mysql -u root -p mysql>create database swara; mysql>exit

Step 6: Enter superuser mode and run below commands to install and setup Swara wget https://github.com/ccidmysore/swara/tarball/developers mv developers /opt/swara.tgz cd /opt tar xvzf swara.tgz mv ccidmysore-swara-1cc734f swara cd /var/www/ ln -s /opt/swara/web /var/www/swara

Step 7: Set up symlinks and Asterisk configurations

ln -s /opt/swara/web /var/www/html  ln -s /opt/swara/bin /usr/share/asterisk/agi-bin ln -s /opt/swara/bin /usr/share/asterisk/sounds cp /opt/swara/conf/extensions.conf /opt/swara/conf/sip.conf /etc/asterisk cd /usr/share/asterisk mkdir orig && mv sounds agi-bin orig/ ln -s /opt/swara/bin agi-bin && ln -s /opt/swara/sounds sounds cd /opt/swara/conf  sudo gedit swara.conf cp swara.conf /etc cp extensions.conf /etc/asterisk cp sip.conf /etc/asterisk mysql -u root -p swara < swaradb.sql cd /opt/swara/web mkdir /opt/swara/sounds/web && ln -s /opt/swara/sounds/web audio ln -s /opt/swara/sounds/web upload chmod a+rwx -R /opt/swara touch /var/log/swara.log chmod a+rwx -R /var/log/swara.log

Step 8: Download and install chan_dongle-1.1.r14.tgz from https://code.google.com/archive/p/asterisk-chan-dongle/downloads cd ~/Downloads tar -xvf chan_dongle-1.1.r14.tgz cd chan_dongle-1.1.r14 sudo ./configure sudo make sudo make install

Step 9: Setup chan dongle with Asterisk: cd ~/Downloads/chan_dongle-1.1.r14/etc/  sudo cp ~/Downloads/chan_dongle-1.1.r14/etc/dongle.conf /etc/asterisk/  sudo gedit /etc/asterisk/dongle.conf 

Step 10: Setup Asterisk and swara to make calls:  sudo gedit /etc/asterisk/dongle.conf  sudo gedit /etc/asterisk/extensions.conf  exten => swara-local,n,AGI(menu_system_localized.py) to exten => swara-local,n,AGI(/opt/swara/bin/menu_system_localized1.py) 

Installation is now completed. Now to run the IVRS and send voice-sms, connect the USB dongle to the USB drive and follow below steps: --

1. Open the terminal. change to root using the command "su -" 2. Now run the command "asterisk -vvvvvvc". This should run without fail and the CLI prompt should come 3. On the CLI command prompt run the command "agi set debug on" 4. Call to the number and you should hear the IVR prompt 5. Stop to this run "core stop gracefully" 6. Stop and Restart " core restrat gracefully" 7. check Dongle is ready "dongle show devices"

Sending Voice-SMS
Below steps can be followed to send Voice-SMS with above set-up. 1. Open Voice-SMS window. 2. Select your Audio file in *.wav format. 3. Select text file with list of numbers to which the message has to be sent. 4. Enter the duration in seconds. 5. Click on Send to start the calls.

Getting Good Quality Audio for Voice-SMS
Usually in school ambiance, it is difficult to get good quality audio recordings for sending Voice SMS. Great quality audio is very essential for your message to reach your intended audience. Below are few steps one can follow to ensure this:

Before proceeding with below steps, please ensure you have the following with you - Android phone, Audacity software, Tape-a-talk app on your Android and earphones if available.


 * 1) Install Tape-a-talk app on your Android phone.
 * 2) This IVRS platform requires audio recording in *.wav format, so please record using Tape-a-talk which outputs *.wav format audio by default.
 * 3) Set frequency in the android app to 8,000GHz which is another requirement for IVRS.
 * 4) Hold your phone at exactly 450 degree angle and at half-feet distance from your mouth for better audio capture by phone's microphone.(Use earphones if available)
 * 5) Stop the recording when you are done and transfer audio file to your computer.
 * 6) Use Audocity to remove any noise from the audio file and export it to same *.wav format with 8,000GHz frequency.(Listen to your audio file in earphones if available)
 * 7) Use the exported audio file to send Voice SMS in the IVRS applciation.