ELMAR 2009

Building Complex Voice Over IP (VoIP) Applications Based on Open-Source

Transcript

1. Motivation Work and Results Summary Building Complex Voice Over IP (VoIP) Applications Based on Open-Source Sebastian Schumann Ondrej Lábaj Pavol Podhradský Department of Telecommunications Faculty of Electrical Engineering and Information Technology Slovak University of Technology, Bratislava 51. International Symposium ELMAR 2009, 28.-30. September, Zadar, Croatia Schumann, Lábaj, Podhradský Complex Open-Source Based VoIP Applications
2. Motivation Work and Results Summary Outline 1 Motivation Prerequisits Definition 2 Work and Results System Utilization Schumann, Lábaj, Podhradský Complex Open-Source Based VoIP Applications
3. Motivation Work and Results Summary Prerequisits Definition Open-Source Software in Telecommunications Open-source world offers many applications in the area of Voice over IP (VoIP) Wide range of developed software Tools Applications Carrier-grade software Not too many complex systems at the moment Idea Combine open-source software and environments to perform large tasks in a flexible way. Schumann, Lábaj, Podhradský Complex Open-Source Based VoIP Applications
4. Motivation Work and Results Summary Prerequisits Definition Task Aim Fulfill typical tasks of a call-center: The target application should call a list of users and send successfull calls to a media system/agents. Application components should be independent Cost-effective IP based solutions Simple task flow: Input List of users System Attempt calls, route successful attempts Output Provide statistics, clean terminations Schumann, Lábaj, Podhradský Complex Open-Source Based VoIP Applications
5. Motivation Work and Results Summary System Utilization Input List of users to call (CSV) Destination(s) (cron) Max. timeout/retransmissions of initial INVITE (cron) Time period for calling users Schumann, Lábaj, Podhradský Complex Open-Source Based VoIP Applications
6. Motivation Work and Results Summary System Utilization Component Interaction timer .csv user data Generator Analyzer cron Media media stream Schumann, Lábaj, Podhradský Complex Open-Source Based VoIP Applications
7. Motivation Work and Results Summary System Utilization Tools Call Generator: SIPp SIPp is a free Open Source test tool / traffic generator for the SIP protocol. Call Evaluation System: OpenSIPS OpenSIPS (Open SIP Server) is a mature Open Source implementation of a SIP server. Media System Asterisk Asterisk is the world’s leading open source PBX. Execution environment for all applications is GNU/Linux. Schumann, Lábaj, Podhradský Complex Open-Source Based VoIP Applications
8. Motivation Work and Results Summary System Utilization Logical Actions LOG Release call LOG LOG Call user Yes Media End condition on media system* No Call established user side Call released on Interruption Connect to media system * Timer ends, SIPp receives BYE... Schumann, Lábaj, Podhradský Complex Open-Source Based VoIP Applications
9. Motivation Work and Results Summary System Utilization Call Flow (Establishment) User 200 OK+SDP1 PBX SIPp OpenSIPS INVITE INVITE INVITE+SDP1 200 OK+SDP2 ACK off-hook 200 OK+SDP1 ACK+SDP2 ACK+SDP2 RTP Schumann, Lábaj, Podhradský Complex Open-Source Based VoIP Applications
10. Motivation Work and Results Summary System Utilization Call Flow (User hangs up) User PBX SIPp OpenSIPS BYE BYE 200 OK 200 OK BYE 200 OK Schumann, Lábaj, Podhradský Complex Open-Source Based VoIP Applications
11. Motivation Work and Results Summary System Utilization Call Flow (System closes call) User PBX SIPp OpenSIPS BYE 200 OK BYE 200 OK 200 OK BYE Schumann, Lábaj, Podhradský Complex Open-Source Based VoIP Applications
12. Motivation Work and Results Summary System Utilization Examples Automatic calling of users with voice advertising provided by media server. Certain call center agents (i.e., SIP users) will be connected to successful call establishments. (maximum amount of parallel calls monitored on SIPp, maximum utilization of call center) Schumann, Lábaj, Podhradský Complex Open-Source Based VoIP Applications
13. Motivation Work and Results Summary 1 Motivation Prerequisits Definition 2 Work and Results System Utilization Schumann, Lábaj, Podhradský Complex Open-Source Based VoIP Applications
14. Motivation Work and Results Summary Summary Existing VoIP applications are very powerful Carrier-grade IP based Telco environments can be easily extended Usage of presented work (e.g., within ad campaigns) is very cost effective Outlook Continue with useful call-center use cases (e.g., extend OpenSIPS with call queuing functionality) Elaborate other use cases where IP based telephony systems or applications can enhance functionality Schumann, Lábaj, Podhradský Complex Open-Source Based VoIP Applications
15. Motivation Work and Results Summary Contact Sebastian Schumann Department of Telecommunications Slovak University of Technology Bratislava, Slovak Republic schumann@ktl.elf.stuba.sk Schumann, Lábaj, Podhradský Complex Open-Source Based VoIP Applications