This document summarizes a research paper on implementing a portable voice communication system using Raspberry Pi and Asterisk. Key points: - Asterisk is open-source software that turns a standard computer into a voice communications server, allowing the creation of IP PBX systems and VoIP services. - The proposed system would use a Raspberry Pi running Asterisk to establish voice calls between mobile devices connected to a WiFi network, replacing the need for a traditional expensive PBX system. - Clients would install the Zoiper SIP client application and configure profiles to make calls between phones and laptops without a SIM card or internet connection needed. This provides a low-cost solution for voice communication over IP networks.

1. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056
Volume: 04 Issue: 02 | Feb -2017 www.irjet.net p-ISSN: 2395-0072
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REVIEW ON PORTABLE VOICE COMMUNICATION SYSTEM IN
RASPBERRY PI
Akshay Khamankar1, Amogh Phirke2, Khushboo Shah3 , Diksha Rangare4
Professor Ashwin Shinde5
1234 Student, CSE, Dr. Bababsaheb Ambedkar college of engineering and research, Maharashtra, India
5Professor Ashwin Shinde,Department of Computer Science And Engineering, DBACER ,Nagpur
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Abstract - : Asterisk is a product execution of a phone
private branch trade (PBX); it permits appended
phones to make calls to each other, and to associate
with other telephone utilities, for example, people in
general exchanged phone organize (PSTN) and Voice
over Web Convention (VoIP) administrations. Its name
originates from the Asterisk symbol. Asterisk is usually
hosted as a server where a mode of communication is
established among ‘n’ number of entities. Here ‘n’
denotes number of mobile devices.
Key Words: Asterisk, Raspberry Pi, SIP-Client
Application, Wifi-Router
1. INTRODUCTION
The advancement of Asterisk in view of Voice
Exchange and its applications needs to consider the
developing intricacy with the current РBX (private
branch trade) systems. A promising arrangement is
the voice trade in light of Bullet, which deals with
VoIP (Voice over Web Conventions) and gives an
additionally encouraging and adaptable
arrangement. VoIP innovation was started in 1995.
Around then specialists started to understand the
capability of sending voice information bundles over
the Web instead of conveying through standard
phone frameworks. The proposition is to utilize the
web as a phone coordinate with some extra abilities.
Rather than conveying over a circuit exchanged
system, this application permits correspondence
between two gatherings over the bundle exchanged
Web and it was in 1995, when the primary web
delicate telephone showed up .
This idea permitted Рс clients to dodge long
separation charges, consequently incredible for
global calling and a promising answer for the
corporate world. Truth be told one of the primary
zones of its applications is the call focuses, where the
client can speak with an administrator by means of
the web. As of late there have been recommendations
in different nations to permit web communication,
which is to be sure an appreciated stride. This
implies individuals can utilize VoIP administrations
to interface the customary phone. For this situation
call traversed the Iр arrange, yet ends at the
neighborhood telephone organize, whose proprietor
than charges an expense that is ordinarily the cost of
a nearby call.
The improvement of Asterisk Voice Trade which
works in light of VoIP thinks about the different
complexities related with a routine Private Branch
Trade (РBX). A traditional circuit exchanging based
РBX is costly as well as restricted regarding
usefulness too (1). Reference mark is an entire
telephone framework in programming. It can
supplant vast and costly telephone frameworks
fueling a huge number of expansions, or it can help
clients spare cash on long universal call utilizations.
Since being actualized in programming, it's
amazingly adaptable, simple to tweak as and simple
to amplify Unlimited VoIP, which is the essential
building piece of Reference bullet based voice trade
makes it feasible for individuals to utilize their
telephones either settled or portable to call others in
the nation and globally for a small amount of the
costs they pay now.
All that one needs to make a Рс to Рс call is a VoIP
based programming. Next to this, economies
additionally assume an imperative part in promoting
this new idea . A typical telephonic call requires 64
kbps, though the same can be taken care of an as low
as 6-8kbрѕ utilizing codecs, for example, GЅM.
Consequently the transmission capacity
prerequisites will be significantly decreases and one
can stuff up, more brings in a similar given transfer
speed, giving an obvious favorable position. In future
individuals will quit paying for voice calls simply like
for every email they sent or each webpage course a
specialist co-op would charge giving web
administrations, however ever past that point
wouldn't convey any future where everybody will
dependably be merging a few observers about will at
long last turn into a reality

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2. Literature Review
An extensive part of writing on Asterisk uncovers
that it is diverse for some reasons, the most essential
being it's all product approach. Rather than
exchanging simple lines in equipment, it courses and
controls .Voice over Web Conventions (VoIP)
Bundles in programming. The foundation of the
framework by and large turns into an ip empowered
system, and telephones can be guided into that. Be
that as it may it likewise underpins old simple
telephones utilizing entryway gadgets. Reference
bullet gives more than what one would with the
exception of from an ordinary РBX. Clients get a
assortment of components, for example, paging,
(which might be from coordinated or many to-one,
contingent upon the utilization prerequisites),
Intelligent voice reactions (IVR), Conferencing, Voice
message, Music on hold to give some examples.
On top of that clients can get interfaces to the
working framework and programming dialects for
the
extraordinary in power, discretionary online
organization interfaces, design in ЅQL databases or
level records,
definite call signing into a database and numerous
more elements (3). Thus to compress it up, one might
say that
that with Asterisk client can:
 Provide fundamental administration to
Analog and Digital telephones.
 Develop a call steering rationale with a
specific end goal to pick a minimum costly
approach to highway a specific call.
 Route Incoming and Outgoing voice brings
over standard voice lines or the web.
 Provide voice message and video chatting
administrations
 Develop perplexing or basic intuitive menus
 Operate little or expansive lines for call
focuses
 Announcing the assessed hold time to the
guests
 Call different projects on the framework.
Asterisk's Architecture
Asterisk is painstakingly composed adaptability.
Particular AРIѕ are characterized for most extreme
around a focal РBX
center framework (1). This progress inward
interconnection of the РBX from the particular
conventions, codecs equipment
interfaces from the communication application. This
permits Asterisk to utilize any appropriate
equipment and innovation
accessible now or later on to play out its fundamental
capacities, interfacing equipment applications.
2. Proposed Plan
The purest VoIP usage utilizes IP competent end-
client hardware, for example, IP telephones or a PC
and does not depend on a standard phone switch.
Figure is a streamlined outline of an IP phone
framework associated with a wide territory IP
organize. IP telephones are associated with a LAN.
Voice calls can be made locally over the LAN. The IP
telephones incorporate codecs that digitize and
encode (and unravel) the discourse. The IP
telephones additionally packetize and depacketize
the encoded discourse into IP parcels. Calls between
various destinations can be made over the wide
region IP arrange. Intermediary servers perform IP
telephone enlistment and arrange call flagging,
particularly between locales. Associations with the
PSTN can be made through VoIP entryways.
Programming:
Asterisk:
Asterisk is an open source system for building
interchanges applications. Asterisk transforms a
conventional PC into a correspondences server.
Asterisk powers IP PBX frameworks, VoIP portals,

3. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056
Volume: 04 Issue: 02 | Feb -2017 www.irjet.net p-ISSN: 2395-0072
© 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 1728
gathering servers and that's only the tip of the
iceberg. It is utilized by private companies, huge
organizations, call focuses, transporters and
governments around the world. Bullet is free and
open source. Asterisk is supported by Digium, the
Indicator Organization. Indicator gives an amazing
rundown of abilities and components like IVR and
wifi free calling
After the Asterisk programming has been introduced,
the client can begin Indicator Scripting inside the
Taste . Config [Session Start Protocol] executable
envelope.
The scripting will be accomplished for Client
Creation.
It will be then used to do programming and scripting
for allocating numbers and watchword for various
clients.
Dial Arrange Programming will be executed in
augmentation . config record and Taste will be
instated.
Customer Establishment:
After every one of the conditions, virtual products
and scripting have been effectively introduced and
executed.
The Asterisk server will give diverse profiles which
should be introduced on Zoiper application .
Subsequent to doing Taste manual arrangement on
Zoiper application, it will be prepared to use to make
sound or video calls from Telephone to Telephone or
Portable workstation –Laptop individually.
In this way the clients should introduce Customer
sided Zoiper Application alongside profiles in which
distinctive outbound intermediaries and IP-Address
will be alotted and henceforth they can make calls
without a sim card and web.
3. CONCLUSIONS
This venture depicts one answer for a nearby PBX in
light of existing LAN equipment framework. It is a
minimal effort and particular arrangement that
totally meets its essential capacity, transporting of
voice bundles over IP systems. Since most of the
handling is performed on a PC it gives a number
of extra elements.
The primary preferred standpoint of the framework,
that it diminishes the wiring fetched as EAPBX
framework. The expansions can be effortlessly made,
erased or moved without irritating the other
correspondence. We can design the framework from
any PC in the system utilizing web program.
There were many focal points required in our
venture:
01) Simple to oversee utilizing web
02) Phone message office if client is disconnected
03) Call holding up administration
04) Sound Video Conferencing
05) Remote IP telephone gadget
06) Low support cost
07) Augmentations can be made or erased
effortlessly
08) Call cost lessening
09) No need of additional wiring
10) Substantially simpler to introduce and design
than an exclusive telephone framework
11) Permits clients to hot connect their telephone
anyplace to the office
REFERENCES
1. SR. Sonaskar. Design & Implementation of IP-PBX
for Small Business Organization International Journal
of Engineering Innovation & Research Volume 1,
Issue3, ISSN: 2277€5668
2. SR Sonaskar. Voice over intranet based private
branch exchange system design, ICECT 2011, 3rd
International Conference at Kanyakumari, INDIA E-
ISBN: 978-1- 4244-8679-3
3. SR. Sonaskar. Low Cost IP Private Branch Exchange
(PBX) IJCA Online Number 1 - Article 1, 2011 ISSN:
0975–8887
4. “SMALL OFFICE PBX USING VOICE OVER
INTERNET PROTOCOL (VOIP)” Md. Zaidul Alam,
Saugata Bose, Md. Mhafuzur Rahman, Mohammad
Abdullah Al-Mumin ICACT 2007