1. Basics of IP Telephony Sam Lutgring Director of Informational Technology Services Calhoun Intermediate School District

2. What are we here to talk about?

3. Evolution of Communications

4. Basic Terminology (1 of 3)  PSTN – Public Switched Telephone Network  PBX – Private Branch Exchange  CO - Central Office  Centrex or Hosted/Virtual PBX  POTS – Plain Old Telephone Service  FXO - Foreign Exchange Office  FXS - Foreign exchange Station  Channel Bank

5. Basic Terminology (2 of 3)  Digital Circuit  T1 – Digital Network Interface  PRI – Primary Rate Interface  IP - Internet Protocol  Convergence or multiservice networking  Unified Messaging  VoIP – Voice Over Internet Protocol  VoIP PBX

6. Basic Terminology (3 of 3)  VoIP Gateway  VoIP Service provider  SIP - Session Initiation Protocol  CODEC  G.711 ulaw  IVR – Integrated Voice Response  PoE – Power Over Ethernet

7. Basics of a PBX  Establishing and maintaining connection (call) between end devices  All the call features –Conferencing –IVR –Transfer –Call pick-up

8. What is VoIP?  Voice Over Internet Protocol –Allows voice to become simply another piece of data (packet) riding the network –Takes advantage of existing data networks by combining components of data and voice networks –Transports voice packets using Internet Protocol (IP)

9. What is VoIP?  Both a technology and a service –The technology is Internet Protocol (IP) allowing the packets to be transferred across the data network –The service is the voice portion, allowing voice to be transferred across the network

10. What is VoIP?  Three Common Types –Geek-to-Geek –Gateway/Switch-to-PSTN – PSTN-to-PSTN

11. Why is it Catching On?  Integration and application management  One physical layer one infrastructure (single wiring closet) –Simpler and less expensive to install and maintain –Leverage common data network and equipment  Simplification –Single network management system –Moves, adds, and changes for phones –Deployments

12. Why is it Catching On?  Flexible IP address assignment  Increased system redundancy  Backup consolidation  Customized end user experience  Cost (in some cases)

13. What is the Future? A3A3 sip:sam.lutgring@phone.calhounisd.org

14. What do I need to know?  Requires a robust data network  Network outages/issues impact voice network  Redundancy/Failover  Emergency Services  Connecting to traditional phone services  Voicemail/e-mail integration

15. QUESTIONS? www.voip-info.org