1. Building A Telephony Application With FreeSWITCH and Lua:
William Dale, PE
San Diego CA
Employee Time Clock
William Dale, PE - Cluecon 2011 –

2. William Dale, PE - Cluecon 2011 – www.labortimetracker.com
Intro
Overview
William Dale, PE - Cluecon 2011 –

3. William Dale, PE - Cluecon 2011 – www.labortimetracker.com
Technology Stack
Debian 6 (Squeeze)
Freeswitch
Apache
JBoss
PostgreSQL
Perl
Future Technologies
No SQL
CDN
Global DNS
Jester?
Gemeinschaft?
Sangoma?
Overview
William Dale, PE - Cluecon 2011 –

4. Architecture Overview
PSTN
Gateway
(Inbound Phone Call)
Com Server (FreeSWITCH)
✓ Dial Plan
Lua Script
Mod_CURL
PSTN Gateway
COM Server
Application Server
Database Server
Database
Exec
Stored Procedure
Web Service
Querystring Parameter
(HTTP Get)
Overview
William Dale, PE - Cluecon 2011 –

5. Route Phone Call to FreeSWITCH
Contract with PSTN Provider
SIP Trunk
Toll Free Inbound
Secondary SIP Trunk
Register Gateway with FreeSWITCH
PSTN
Gateway
(Inbound Phone Call)
William Dale, PE - Cluecon 2011 –

6. William Dale, PE - Cluecon 2011 – www.labortimetracker.com
FreeSWITCH
Register Gateways (SOFIA STATUS)
Enable Modules
Mod_flite
Mod_curl
Configure Dialplan
Regex the Inbound Number(s)
Transfer inboud call to extension 5050
Exec Lua script based on extension
Com Server (FreeSWITCH)
✓ Dial Plan
Lua Script
Mod_CURL
William Dale, PE - Cluecon 2011 –

7. William Dale, PE - Cluecon 2011 – www.labortimetracker.com
Web Services
Setup Listener
Security
Source IP
SSL
TOKEN
Return values
XML
CSV
Fix Length String Value
Web Service
Querystring Parameter
(HTTP Get)
William Dale, PE - Cluecon 2011 –

8. William Dale, PE - Cluecon 2011 – www.labortimetracker.com
Sound File Processing
Process wav files
Convert to compressed format
MP3
OOG
Create Work Flow
Use folders
Convert to mp3/ogg
Post to web services
Asynchronous call
Clean up
Web Service
REST
nginx
William Dale, PE - Cluecon 2011 –

9. William Dale, PE - Cluecon 2011 – www.labortimetracker.com
Call Database
Database Call
Exec Stored Procedures
Pass in parameters
Performance
Keep within 40 – 80 ms.
Database
Exec
Stored Procedure
William Dale, PE - Cluecon 2011 –

10. Freeswitch Enabled Features
Group communications
Employee send messge
Play Supervisor/Group
Voice Verification
Expenses
Mileage
Tips
Sales
William Dale, PE - Cluecon 2011 –

11. William Dale, PE - Cluecon 2011 – www.labortimetracker.com
DEMO Application
Login into
Freeswitch (fs_cli)
Labor Time Tracker (Web App)
Call Toll Free Number
Enter Job/Department ID
Enter PIN
Employee has punched timeclock!
William Dale, PE - Cluecon 2011 –

12. Building A Telephony Application With FreeSWITCH and Lua:
Question and Answers
William Dale, PE - Cluecon 2011 –