Basics of IP Telephony

Sam LutgringDirector of Informational Technology Services

Calhoun Intermediate School District

What are we here to talk about?

VoIPIP PBX

PoE

Converged Networks

Telepresence

VoIP Gateway Central Office

Evolution of Communications

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

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

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

Basics of a PBX

Establishing and maintaining connection (call) between end devices

All the call features– Conferencing– IVR– Transfer– Call pick-up

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)

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

What is VoIP?

Three Common Types– Geek-to-Geek – Gateway/Switch-to-PSTN– PSTN-to-PSTN

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

Why is it Catching On?

Flexible IP address assignment Increased system redundancy Backup consolidation Customized end user experience Cost (in some cases)

What is the Future?

WIFIGateway

IP PhoneIP PBX

FaxGateway

SmartPhone

Video

`

DesktopLaptop

(Soft Phone)IP Network

PDAWIFI

CellPhone

A3sip:sam.lutgring@phone.calhounisd.org

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

QUESTIONS?www.voip-info.org