SipExchange
Group 8
Clay Dickerson, Evan Huffty,
Nathan Rasmussen, Brent Washington
Key Words
SIP – Session Initiation Protocol – This is
a signaling protocol which resides at the application layer. It is used for creating, modifying, and
termination sessions with one or more participants.
PBX- Private Branch Exchange – The PBX is a private telephone network used within a
company.
J2EE - Java
2 Platform
VOIP – Voice Over Internet Protocol – The transmission of voice over IP based networks.
ATA – Analog Telephone Adapter - A phone handset
to the Ethernet adapter that allows analog telephone devices to be used with
VOIP services and equipment.
Softphone – A softphone is client software that loads the VOIP service onto your desktop or laptop.
SipExchange is an open-source softswitch that provides standard SIP services like registration, proxy and presence. This application allows service providers to offer telephone services to their clients as well as other services based on voice, video, and instant messaging. SipExchange supports many of the standard subscriber features offered by the traditional telephone exchanges and PBXs. In addition, it supports external call control capabilities, allowing service providers and software developers to update and plug the new services into the SipExchange application. SipExchange leverages the Java and J2EE technology as a basis for the architecture that is flexible, scalable and easily extensible. It runs as an enterprise application inside the JBoss server and takes advantage of many services that a J2EE server provides. SipExchange provides a web-based user interface in which administrators can manage subscribers and features as well as perform other routine operations. SipExchange also provides a web-based user interface choosing which subscribers can customize the features they have subscribed to. VOIP is a key item in this.
VOIP is a method for
taking analog audio signals, like the kind you hear when you
talk on the phone, and turning them into digital data that can be transmitted over the
Internet. It was developed by Tom
Keating in 1996, when his boss gave him the challenge of creating a test lab
for CTI (Computer Telephony Integration).
Thus, VOIP was born. What is the
upside? You can pass the telephone
company and its charges entirely. With
VOIP, you can make a call from anywhere you have broadband connectivity. Since the IP phones or ATAs broadcast their
info over the Internet, they can be administered by the provider anywhere there
is a connection. Business travelers can
take their phones or ATAs with them on trips and always have access to their
home phone. Another alternative is the softphone.
One advantage of using VOIP technology is the use of the Internet's packet-switching capabilities to provide phone service. For example, packet switching allows several telephone calls to occupy the amount of space occupied by only one in a circuit-switched network. Let’s say a phone call is made for 10 minutes at 128 Kbps. Using VOIP, the same call could have lasted 3.5 minutes at 64 Kbps, leaving another 64 Kbps free for another 3.5 minutes, which would allow for an additional 128 Kbps to be made for the remainder of the 4.5 minutes. Even with the remaining space, 3 or 4 phone calls could be made, and this is without the data compression factor which would further reduce the size of the call. With advantages come disadvantages. VOIP is dependant on wall power. The phone uses phantom power provided by the office. With VOIP though, no power means no phone. Another disadvantage could be other devices on the network, such as a digital receiver, or home security systems. These use standard telephone lines, but are not yet provided by VOIP. Since VOIP uses the internet connection, problems such as hiccups, latency, and packet loss could occur.
This could be a big advantage to a lot of companies. This could eliminate the use of phone lines in a business, and increase the amount of information sent over the use of the current internet resources. Updates could be made rapidly over a single, or multiple computers without the need of somebody going to each individual computer maximizing computer resources.
References
Valdes, Robert (2006) How Does VOIP work? Retrieved
Café Sip (2005) http://www.cafesip.org/projects/sipexchange/index.html
Keating, Tom (
http://blog.tmcnet.com/blog/tom-keating/voip/voip-history.asp
SIP Exchange
Group 8
|
1. |
What is SIP
Exchange? |
|
A. |
Technology that
allows you to call other people |
|
B. |
A Microsoft
word program |
|
C. |
Telephone to
their subscribers that offers voice, video, and instant messaging |
|
D. |
None of the
above |
|
2. |
What does SIP
Exchange include? |
|
A. |
SIP
messaging |
|
B. |
Jiplet
Container |
|
C. |
Call processing
|
|
D. |
All of the
above |
|
1. 3.3. 2.33. |
What does a
Jiplet Container do? |
|
A. |
Provides you
with internet access |
|
B. |
It provides the
infrastructure for SIP communications |
|
C. |
Protects your
computer from viruses |
|
D. |
Converts voice
signal into a digital signal |
|
4. |
What is VOIP? |
|
A. |
Technology that
allow you to call other people using a broadband Internet connection |
|
B. |
Provide the
infrastructure for SIP communication |
|
C. |
Communicates
with SIP phones using standard SIP protocol |
|
D. |
Serves as a
firewall |
|
5. |
How does VOIP
work? |
|
A. |
“Hot Spots”
allow VOIP to be wireless |
|
B. |
Through the
Jiplet Container |
|
C. |
VOIP converts
the voice signal from your telephone into a digital signal that travels over
the Internet |
|
D. |
Both a and
c |
|
6. |
Which is not an
Ideal benefit of SIP Exchange? |
|
A. |
Doesn’t
eliminate phone lines in a business
|
|
B. |
Talk to anyone
in the would for a long as you want |
|
C. |
One can talk
with many people at the same time |
|
D. |
Update could be
made rapidly over a single or multiple computer |
|
7. |
The cell
processing component consist of a number of |
|
A. |
containers |
|
B. |
Micro chips |
|
C. |
Jiplets |
|
D. |
None of the
above |