Transcript V.O.I.P - Australian Computer Society

V.O.I.P
Voice on Internet Protocol
By
Matthew Bulat
M.Eng.Tech MCSE MCDBA BOCP
What is VOIP?
• Routing of voice conversations over the Internet or
through any other IP-based network.
Why use VOIP?
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Cheaper telecommunications
Less phone line rental
Less wiring required
“Free” phone calls in some situations
Video conferencing possibilities
Branch offices may not need a PABX
Use Wifi bridges to connect phone system
VOIP status now
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IP capable PBX becoming dominant
Skype have over 100 million users
VOIP service market increasing 62% / year
IDC Australia predicts that by 2009 there could
be as many as half a million retail VOIP users in
Australia
• Ideal Electrical has VOIP enabled PBX
• SA Government has VOIP enabled PBX
• New Zealand Govt. had VOIP enabled PBX
What do I need for VOIP?
• A network connection LAN/WAN/Internet
• Spare network bandwidth for VOIP call traffic
• Quality of Service to give priority to voice
traffic
• Soft Phone software with headset or
• Broadband Router with phone socket + phone
or
• Router + Analog Telephone Adapter + phone
or
• PABX with VOIP facilities
• Wifi Router + Wifi phone handsets
When can I consider VOIP?
• When moving to a new building
• When STD calls and International calls costs
need to be reduced
• When line rental fees need review
• When new EFTPOS, fax, modems need to be
added
• If call count per month is high
Disadvantages of VOIP
• Quality of calls across Internet is not assured
• Broadband equivalent connection needed for
connecting offsite
• Network switches may need replacement
• Power on Ethernet may need to be established
over the LAN
• Phone availability is dependant on network
hardware and power
• Some VOIP providers have fees
• Emergency calls 000 do not issue an origin
VOIP Alternatives
• Call cap plans with Telecommunications
provider
• Virtual fax lines that get sent to email
• ISDN D channel for EFTPOS
• Advanced forms of Instant messaging
• Use mobile phones and reduce land lines
• Least cost routing with various carrier prefixes
Soft Phone e.g. Skype
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Free software
Free Skype to Skype
Free Video Conferencing
Prepay to call real phones
Prepay for phone no. (10
Euro for 3 months)
Voicemail with phone no.
Send SMS from PC (has fee)
Can use wherever on
broadband
Can work with Pocket PC wifi
VOIP with real phone e.g. Engin
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Analog Telephone Adapter $199 with phone socket
Phone number $9.95 per month
10 cent local and national calls un-timed
Can receive landline and VOIP line to 1 phone
Can fallback to landline if power/network fails
VOIP from router
• Use standard phones connected directly to router
• Cheaper than router + analog telephone adapter
• Quality of service provided at the router
Hybrid PABX inc. VOIP
• Adding hardware to existing PABX can gain
VOIP between sites while leaving the office
architecture the same
• Calls can fallback to landlines if WAN is at
capacity
• VOIP can present itself as a PSTN line to the
PABX for traditional use
• Least Cost Routing can divert certain calls to
VOIP system lines
Large PABX Multi site VOIP
Sample Large VOIP PABX features
• Up to 6000 extensions controlled by 2 RU
device
• Whole configuration is held in PC-card storage
card which can be programmed offsite
• Browser can be used to adjust configuration
• Wireless LAN handsets
Soft phone PABX Extension
Virtual Private Network compatible
Microsoft Office Communicator 2005
• Talk, video conference, chat, whiteboard from
PC and phone
• Know current status of who you want to
contact e.g.. At desk, away, on phone, in
meeting, not logged in
• Pop up when call comes in with caller details
• Dial, transfer call from Outlook type list on PC
• Missed calls can show up as a email, click to call
back
• Divert to a mobile when logged off PC
Office VOIP wiring
• One Cat-5 lead for phone and computer (1/2 cables)
• PABX , network switch and Power on Ethernet need a
good UPS.
• Analog devices like faxes/modems need analog adapters
• Branch to branch calls have no telephony fees
VOIP Management
• Using the LAN/WAN program phone systems
across the Enterprise
• Better GUI interfaces to control 100’s of
possible features
• Handset movements in the network keep there
extension number as they go.
• Web server interfaces for programming at
different access levels possible
VOIP specs
• Clear voice communications can be had using
64kb bandwidth (both ways). E.g. G711 codec
(~28 MB / hour)
• With extra compression and processing time
voice communication can get by with 8kb
bandwidth. E.g. G729 codec (~3.6 MB / hour)
Security
• Maintain firewalls, anti virus, security patches, review
logs, review activity
• Select software that needs a minimum number of ports
open.
• Direct certain ports to defined IP addresses to handle
the traffic.
• Define what applications can use a port.
• Encrypt voice signals and protocols used
• IP handset MAC address permissions given by PABX
• Wifi SSID, WEP/WPA, MAC address filtering
• Secure VPN connections
New possibilities for telephony
• PABX – LAN ~ Wifi Bridge ~ LAN – computers and
phones
• No phone system needed in second building
• No cabling required across roads, common land etc.
Remote Telephony
• Work from home using computer as a phone extension
from work.
• Work at multiple branches where your computer keeps
its extension number as you move.
The Future
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Mobile phone that can do Wifi VOIP if in range
VOIP using Wimax (no phone lines required)
Internet / VOIP / Video on demand broadband
ISP’s working like carriers with Quality of
Service for VOIP on their network
• Wireless phones with Skype built in (2006 Q3)
Wifi Skype Phone with no PC
Resources
• www.phonechoice.com.au (includes calculator for plans
based on your current usage)
• www.OzInternetPhones.com.au (list providers)
• http://www.erlang.com/calculator/lipb/ (voice paths
to VOIP bandwidth calculator
• www.voipnews.com.au
• http://www.avoipa.org.au/ Aust. Comm. Industry
Forum
• http://www.acma.gov.au Aust. Comm. & Media
Authority