1. VoIP Demonstration
9/21/2018

2. Goals of Presentation Introduction to Voice Over Internet Protocol
Open Source Example
What does it take to Setup
How much does it Cost
Demonstration
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3. Introduction VoIP - Voice Over Internet Protocol Who has used VoIP?
Focus on IP Private Branch Exchange
Long Distance carriers use IP to carry there voice traffic.
Vonage
Time Warner
Insight will be coming soon
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4. Some Facts
Com and Cisco go head to head with VoIP IP PBX release
By June 2002 Cisco shipped more than 500,000 IP phones and more than 6,000,000 VoIP ports
Who is in the VoIP market
3Com, Alcatel, Avaya, Cisco, Ericsson, Mitel Networks, Nortel, Siemens, NEC
$500-$700 per IP phone handset has made it difficult for businesses to deploy
All PBX vendors are in the market.
D-Link and LinkSys are providing appliances for small businesses
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5. VoIP is a world of opposites
Unlike most IP applications voice is sensitive to jitter, delay, and packet loss
Data has to be accurate but not timing
Voice has to have timing but not accurate
QOS, Quality of Service, is used to correct
Jitter is the variation in delay in packet delivery which causes syllables to be lost.
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6. Internet Protocols VoIP can use both IAX – Inter Asterisk Exchange
TCP – Transmission Control Protocol
UDP - User Datagram Protocol
IAX – Inter Asterisk Exchange
Proprietary protocol used for trunking
Advantage only uses one port through firewalls
Conserves bandwidth through the use of trunking
SIP – Session Initiation Protocol
Rapidly becoming the industry standard
Requirements for SIP through firewall.
SIP signaling: Ports 5060 to 5070
Real-Time Transport Protocol, RTP, audio: Ports 8766 to 35000
SIP does not support all features required in an IP PBX solution so vendors create their own proprietary protocol to provision handsets.
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7. Bandwidth Requirements
Codec – COder DECoder
We will need at least 80 kilobits of capacity to the Asterisk server based on using G.711 codecs which converts analog voice to digital by sampling voice 8000 times a second at 8 bits. 80 kbts = 64 kbs + overhead.
There are other voice encoding methods that get as low as about 4kbps.
VoIP does not do fax with lossy codecs.
As we change from codec to codec it affects voice quality.
Cisco uses G.729 Codec which is 8 kbs.
We can use G.729 but would need to purchase license.
Any Questions on introduction to VoIP?
9/21/2018

8. Open Source Example
Asterisk was released to the community for development by Mark Spencer. Mark Spencer also owns Digium who produces interface cards, a commercial version of Asterisk, and support.
was created to ease the burden of install and maintenance of an Asterisk IP PBX and is a full feature Asterisk release.
We are using because of ease of use.
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9. Advantage of OpenSource Asterisk
Date: Wed, 16 Nov :48:
We are proud to announce that Asterisk has been released!
This release of Asterisk contains over 3,000 improvements on version 1.0, including hundreds of new features and applications.
We want to extend our thanks to all the community members whose contributions have made this release possible; without their coding, support, testing and other involvement we would not have achieved this milestone!
Mark Spencer and Kevin P. Fleming
Continuous improvement process
Bug Tracking
CVS is a popular version control system and can be used to maintain most current platform.
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10. Asterisk@Home Features
IP PBX, Private Branch Exchange
Flexibility
Supports Scripting Language
API – Application Programming Interface
Voic
Any Questions on Open Source example?
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11. What does it take to setup
Get the Software
Install Software
Select Dial Tone Provider
Configuration
Place Calls
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12. Get the Software asteriskathome.sourceforge.net Bootable CD
ISO CD image
Bootable CD
Formats harddrive
Installs Linux CentOS 3.5 with Asterisk 1.0.9
Installs Web Server
Installs MySQL Server
X-Lite from Xten.net
Free download softphone
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13. Install Software Asterisk@home X-Lite Softphone
Claims 1 hour to be up and running
Actual 25 minutes before configuration
X-Lite Softphone
Successfully installed with in 10 minutes
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14. Softphones Are software based phone clients
Available for most operating systems
Ability to connect over LAN and Wireless
For our presentation we will be using X-Lite
Free SIP based client from Xten
Supports Windows, Pocket PC, and MAC
Video SIP based softphone available for purchase
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15. Selecting Dial Tone Provider
PSTN, Public Switched Telephone Network
Requires an analog interface device
IP based
Multiple vendors available
FWD – Free World Dial up
Access to other FWD users only
Teliax
My VoIP host provider of choice
Pay as you go account
PSTN example is Cincinnati Bell
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16. Configuration Follow guidelines Asterisk@Home handbook
Failed configuring FWD, Free World Dialup
Provider claims to have availability issues with IAX but SIP works
Teliax took several tries but was repeatable
No standards in configuration
X-Lite Softphone
Successfully installed and configured with in 10 minutes
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17. Cost of Presentation $0 Borrowed Dell SX260 Desktop
$30 Pay as you go IP provider
$0 Free X-Lite soft phone
$30 total
$0 Borrowed Cisco Handset
Phone number $4.50 per month, 2 cents a minute for outbound, inbound free.
Providers $2.00 per month, half a cent per minute usage.
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18. Cost of my home IP PBX Broadband Internet connection. Cable
$150 Compaq Evo Desktop
Pay as you go IP provider
$4.95 monthly 2 cents a minute outbound
$300 TDM31B Interface card for analog line
$450 total
Any questions on cost?
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19. Asterisk Management Tools
AMP Asterisk Management Portal is a web GUI application that allows configuration of Asterisk without editing configuration files.
Flash Operator Panel is a real time web interface to Asterisk showing what all the extensions, trunks, and conferences are doing.
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20. Voicemail Sends WAV VIA E-mail
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21. Network for Demonstration
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22. Tonights Demonstration
Two IP PBXs
IP PSTN Provider Teliax
IAX2 trunking
Softphone Client X-Lite
Hardphone Cisco 7960 with SIP image
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23. Demonstration Softphone Client X-Lite *60 Time *61 local weather
Reads back system time
*61 local weather
FTPs text file from weather.noaa.gov for Covington
Reads file
*62 Wake Up Call
Will call back at set time
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24. Demonstration Outbound IP Provider Inbound IP Provider 859-795-0405
Uses IAX2 provider for outbound
Inbound IP Provider
Uses IAX2 provider for inbound
Outbound IAX2 trunk to my house
3+200
Dial extensions directly
200 through 212
Cell
Do not know the limit for IP trunk
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25. Resources www.tmcnet.com/it/0602/0602fti.htm
Handbook version 1.6
Teliax.com IAX Trunk Setup instructions.
Exten.net
VoIP Telephony with Asterisk, Paul Mahler
Business Data Communications, William Stallings
9/21/2018