1. Dhaka International University
Presentation topic: VOIP
Name : Md.Rokonuzzaman
Roll : 27
Reg No: 103454
Batch No: E-36th
Md. Abdul Baset
Chairman of EETE,
Dhaka International University
Submission Date: 27-March-2020
Page no: 01
Voice over Internet
Protocol (VoIP) is a
technology that enables
one to make and receive
phone calls through the
Internet instead of using
the traditional analogy
PSTN (Public Switched
Telephone Network) lines.
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4. What is VoIP
Voice over Internet Protocol, also called IP
telephony, is a method and group of technologies
for the delivery of voice communications and
multimedia sessions over Internet Protocol
networks, such as the Internet.
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5. VoIP is packetisation and transport of classic
public switched telephone system audio over an
It allows 2-way voice transmission over
It is also called IP telephony, internet telephony,
voice over broadband, broadband telephony.
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6. Applications of VOIP
Some application that you used in our daily life
is based on VoIP.
Like Skype, Gtalk, Yahoo Messenger, Fring, E-
buddy, Nimbuzz, Twinkle, Brosix, SIPSet,
Gizmo, iChat, iCall that are used on various
platform like Windows, Linux, MAC OS X,
Android and many mobile platforms.
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8. How VoIP works
VoIP protocols first converts your voice or
media into digital signal and travels over the
internet. At receiver side it decode in its
VoIP allows you to make a call from your
desktops/laptops or from IP phones using
internet. You can make a call from your
traditional telephones using special type of
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10. Technical Issues
1. Choppy Voice
Turn off all other computers connecting to your
Test our bandwidth speed. There are several websites
that offer this service free.
Check your running applications for bandwidth usage.
Test for malware and spyware. There are several free
anti-malware software available online.
Configure your router’s QoS to prioritize voice
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11. 2. Echo
To resolve VoIP echo issues, try these easy steps:
Cover your phone’s mouthpiece. If the echo lessens, it
means that you just need to turn down the volume of your
Move your router away from your computer’s monitor, CPU
and power strip.
Disconnect splitters and caller ID devices connected to your
router and your phone.
Inspect your system’s wiring. Make sure your cables are dry
and not too long.
Replace old equipment.
Use a corded phone, instead of a cordless one.
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12. 3. Jitter and Jitter Buffer
Jitter refers to the variation in the arrival time
of voice packets. To ensure that conversations
are understandable, the jitter buffer collects
the packets first and then sends them to the
receiver at an even pace. Sometimes though,
the jitter buffer can be wrongly configured,
which can result in dropped packets and low
quality voice calls.
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13. 4. Bandwidth-Related Problems
Decrease impeding equipment between your computer/SIP
phone, and network connections. For instance, you should
connect directly to your router/switch, instead of accessing
the net via Wi-Fi.
Check your equipment and wiring. Damaged ones can
cause delays, which you may wrongly attribute as
Do a power cycle to see if renewed connections can speed
things up for you.
Turn off all other applications, especially those that use up
a lot of bandwidth, such as gaming apps.
Set your QoS to allot top priority to Voice Applications.
Deprioritize gaming and other similar apps.
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14. 5. Monitor Your Network and VoIP
• To ensure that you’re on top of your VoIP’s
performance, subscribe to a 24/7/365 VoIP
monitoring service provider, such as VoIP
Spear. These business services do round-the-
clock testing of key VoIP performance
parameters and send alerts when you need to
take action. This way, you can do these simple
troubleshooting steps yourself or, in worse
cases, call your tech support.
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15. Legal Issues
Difficult to administrate due to (international)
location independence of IP
VoIP also makes use of encryption more easy
ETSI is working on the issue concerning
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