Real-time multimedia and communication in packet networks iLanga.

Real-time multimedia and communication in

packet networks

iLanga

The Big Idea

1) The flexibility of Asterisk

what we have learnt

2) Working in the software domain

bridge between software and hardware closing

open environment; more flexible to change

3) Allows us to create something very functional yet simple - iLanga

SIP Express Router Focuses only on SIP messaging

Performs forking properly

Is able to handle high volumes of SIP traffic

Has forked into two separate open source projects:

OpenSER

Kamailio

Registration with SER

REGISTER

200 OK

REGISTER (with MD5Hash(user+nonce+pwd))

401 UNAUTHORISED (nonce,realm)

User Devices

Example Call Set-up

3001

3000

INVITE:[email protected] INVITE:[email protected]

INVITE:[email protected]

INVITE:[email protected]

INVITE:[email protected]

3021 0786346926

Hangup

HangupOK

Asterisk

Asterisk The core of iLanga

Speaks

RTP

IAX2

Zap (1 QUADBRI)

4 channels to markreader premium line 2 to Telkom and 2 to Rhodes PBX

Asterisk Uses AGI

Prepaid application

Mark reader application

Extensive use of the Dialplan

Routing to Telkom and Rhodes

Routing to applications

Conferencing Directory Voicemail etc;

MySQL Database We have been configuring asterisk via files in /etc/asterisk

You can also provide configuration via a Database using /etc/asterisk/extconfig.conf

IAX registrations

SIP registrations (SER talks to the database)

Voicemail

Extensions still configured in extensions.conf!

We added “usercontext.conf”

Web Frontend Provides a second way of accessing iLanga

Accessing your PBX from anything other than a telephone is a new concept – Made easy by soft switches.

Update your details

Edit ring-able devices

Listen to and control voice mail

Add prepaid credit

View call log

View the directory – click to dial

Everything you can do on the site – you should be able to do on a phone

Web Frontend Hosted by an Apache web server

Written in Flash

Also allows us to make the web site dynamic!

Talks to

Perl (CGI)

PHP

Java Proxy (used to be Python)

iLanga Proxy Many entities talking to the manager interface caused problems

A Proxy was built

First in Python, now in Java

Passes messages from the web interface to Asterisk

Passes messages from Asterisk to the MySQL DB

Some actions

Icon information

Extension state information

Dynamic content on the front end

Short tutorial on Services

Develop (in your head / on paper) a brief action plan for how you would develop one of the following services:

SPIT (Spam over Internet Telephony) generator

Application to curb SPIT in telephony applications

Asterisk-based markreader that integrates with ROSS to deliver marks to calling students over a phone

Audio database for storing and replaying all the telephone conversations that you make

Meeting scheduler for setting up meetings with other iLanga users

A ‘Hangman’ game that is played over the phone between two players

Present your ideas to the rest of the class