Private Branch Exchange Research Articles

The Development of a Secure Internet Protocol (IP) Network Based on Asterisk Private Branch Exchange (PBX)

The research problem described in this article is related to the security of an IP network that is set up between two cities using hosting. The network is used for transmitting telephone traffic between servers located in Germany and the Netherlands. The concern is that with the increasing adoption of IP telephony worldwide, the network might be vulnerable to hacking and unauthorized access, posing a threat to the privacy and security of the transmitted information. This article proposes a solution to address the security concerns of the IP network. After conducting an experiment and establishing a connection between the two servers using the WireShark sniffer, a dump of real traffic between the servers was obtained. Upon analysis, a vulnerability in the network was identified, which could potentially be exploited by malicious actors. To enhance the security of the network, this article suggests the implementation of the Transport Layer Security (TLS) protocol. TLS is a cryptographic protocol that provides secure communication over a computer network, ensuring data confidentiality and integrity during transmission. Integrating TLS into the network infrastructure, will protect the telephone traffic and prevent unauthorized access and eavesdropping.

Semantics of dynamic hiding in mobile UTP-CSP

We present the semantics of the dynamic hiding operator, which allows hiding new channels as they are acquired in a mobile network. However, silent channels cannot be moved out. Using dynamic hiding, we model the behaviour of a mobile telecommunications network Private Branch Exchange (PBX), which allows the network operator to lease some channels for private use.

Design and implementation of a VoIP PBX integrated Vietnamese virtual assistant: a case study

ABSTRACT As digitization is integrated into daily life, media are increasingly transferred over the Internet. Voice-over-Internet Protocol (VoIP), the most popular media transfer technology, is attracting many researchers and investments. The application of Artificial Intelligence (AI) technology into the Private Branch Exchange (PBX) has played a pivotal role in enhancing the customer experience and is able to unite employees in any company. One technology application used to optimize customer experience in a call centre is the use of an automatic PBX integrated with a Virtual Assistant (VA), which interacts directly with the PBX through voice and in multiple languages without any keystrokes. The Interactive Voice Response (IVR) module forwards the customer’s call to an operator or supports automatic processing. This solution can help businesses to handle thousands of calls per day with optimal performance, thus creating a customer care campaign that quickly reaches many users. A PBX integrated with Vietnamese Virtual Assistants (VVA) on an AI technology platform will also help businesses to cut down on operator costs with automated calls. Through comparison with a traditional PBX, this article analyzes, evaluates and optimizes an automatic PBX system with integrated VVA, thereby offering efficient solutions for interest companies.

Asterisk as a Tool to Aid in Learning to Program

Programming is a key subject in many engineering programs. Students often perceive it as a difficult skill to master. There is extensive literature on helping students learn and improve to program, most of which focuses on K-12 education. However, due to the current demand for workers with programming skills, more research must be conducted on techniques for learning programming at the higher education level. In this work, an analysis and evaluation of the usefulness of an Asterisk Private Branch Exchange (PBX) as an educational tool to improve the programming skills of students in higher education is presented. The study worked with undergraduate students in telecommunications engineering, with little work experience in programming, during the completion of their final year project. Results suggest that using Asterisk has a positive impact on the students’ perception of their programming knowledge and skills, as well as an increment in the interest and comfort regarding programming.

Improving service quality management based on call center monitoring solution.

The presented paper investigates common call center challenges ranging from management to software and agents. Service quality is a complex and multifaceted construction that has a major impact on customer acquisition, retention and loyalty. Because there are a few different factors that influence service quality, call center managers must know what they are before they can work to optimize them. As an important part of any business is communication, both within the organization and with customers and clients, a feature-rich, advanced Private Branch Exchange (PBX) phone system is of great benefit. Call Centers are one of the most commonly used implementations of PBX systems in businesses of any type, shape and size. We suggest an efficient and secure solution for collecting, processing, storing, analyzing and visualizing data from call centers. The proposed approach is driven by applying the type of IP PBX engine based on Asterisk. AWS cloud hosted clustering approaches and load balancing system algorithms have been studied in order to mitigate progressively growing load indicators as we add more customers and thus real data sources to the system. The ELK Stack has been chosen as the optimal approach: it is open source and covers a need in the log management and analytics space. The proposed solution will help to automate the call flow process, where it is necessary, based on the analysis of the collected call centers data. The monitoring results obtained along with the particular call center structure knowledges gives us an opportunity for improving call strategies such as ACDs and IVRs, filling agent's knowledge gaps, eliminating the absence of well-defined practices of call handling, etc. It also eliminates the need to hire additional staff or outsource call centers to share the load.

Design a Real-time Communication System using 3CX Software-based Private Branch Exchange Phone System on Raspberry Pi Device

With the advancement of technology, the telephone network has become the primary mode of communication worldwide, and private businesses have increased their reliance on telephone communication. Many organizations choose to establish their own service in order to manage internal calls. Voice over Internet Protocol (VoIP) is one of the emerging technologies that may provide low-cost service with high-quality and availability. VOIP technology enables the transfer of multimedia data such as audio and video. While some VoIP services require a computer or a dedicated VoIP phone, others allow you to make VoIP calls using your landline phone via a special adaptor. Rather than using a traditional private branch exchange (PBX), we used a Raspberry pi, which is a set of credit card-sized single-board computers, as a server for handling voice and video call communications over a wired or wireless LAN network while monitoring the entire system. Wireshark is a software application that is used to capture packets in a network and present information about certain packets in as much detail as possible.

Characteristic's analysis of associative switching system

This paper introduced new method and model of telecommunication switching system design which can be applied to wavelength-division multiplexing (WDM) optical networks, circuit-switching networks or virtual channel/path connections in an asynchronous transfer mode (ATM) networks. Modern data switching systems such as electronic private branch exchange (PBX), routers and switches include switching matrix which are constructed in the form of bipartite graphs. In such systems, the issues of requests’ processing are considered from the queuing theory point of view. Associative switching systems are fundamentally new structures, therefore it is necessary to develop adequate methods for their throughput determination. Article covered matters of throughput determination basics of an associative switching system and the obtained formulas used for state probability calculation of switching modules and system throughput.

Real-Time Implementation and Testing of VoIP Vocoders with Asterisk PBX Using Wireshark Packet Analyzer

In the present-day digital world, the transmission of information like voice, text, video, etc. demands more bandwidth for fast and accurate transmission. Usually, 90% of information transmitted is the human voice, and various speech processing techniques are adapted for optimizing the bandwidth requirement and enhancing the performance of multiple modules like vocoders in mobile networks. To test the performance analysis of various vocoders, we used a Wireshark simulator with an Asterisk, and it is a software implementation of a private branch exchange (PBX). This work presents the performance evolution of existing voice over internet protocol (VoIP) vocoders using Wireshark with PBX Asterisk’s, The PBX Asterisk’s to analyze and capture the packets or sniffers. The Wireshark tools can diagnose the errors, the traffic flow with a graphical view and generate the statistics in the network. It is a software tool to analyze the traffic data with an intuitive and simple graphical interface in software tools are used to study. The extensive simulations are performed, and the percentage of data saved was calculated and compared with the various vocoders.

Perancangan Jaringan Voice Over Internet Protokol (Voip) Menggunakan Platform Asterisknow

Communication is an important stage to support the running of a work program, without good communication it can cause misunderstandings between the two parties, the importance of the role of communication means several companies are growing rapidly in order to innovate in the manufacture of equipment in the telecommunications sector, which is commonly used in long-distance communication. far is the use of telephone services, both individual telephones and company-based telephones, for some companies that use high-enough telephone activity, this will result in soaring telephone bills that must be paid, thus to reduce the level of communication with high costs, we can use VoIP technology ( Voice Over Internet Protocol) which can be used by utilizing the TCP / IP protocol where the protocol without us realizing it is a protocol used for exchanging data, thus the protocol can also be accessed. used as voice voice data exchange using Open Source Software in the Asterisk application which is used as a substitute for PBX (Private Branch Exchange) devices, where in the application it is used to make the TCP / IP protocol as an intermediary for data exchange to communicate or Voice. The advantage of this application is that it is able to serve a maximum of 1000 online accounts on one server and 240 concurrent calls. This is of course suitable for companies who want to implement this technology based on open source applications.

Latest Trend and Technology of PBX（Private Branch eXchange）Renewal with IP Phone Accommodation

Latest Trend and Technology of PBX（Private Branch eXchange）Renewal with IP Phone Accommodation

A Diagnosis and Hardening Platform for an Asterisk VoIP PBX

Voice over IP (VoIP) is a set of software and hardware technologies used for making voice calls over the Internet. VoIP has been massively deployed in corporative environments since voice and data network convergence enables unified communication services while reducing costs. The main component of a VoIP network infrastructure is the private branch exchange (PBX). Nowadays, Asterisk is the most widespread PBX deployed within corporations due to its open access technology, along with its modular and flexible design. The configuration of PBX systems usually relies on multiple configuration files composed of a vast number of parameters that may have an impact on the security of the system. Therefore, the setup of such systems tends to be complicated and prone to errors and usually requires highly specialized human intervention. In this research, a diagnosis platform for discovering vulnerabilities and security breaches in the configuration of an Asterisk PBX is presented. The proposed platform performs both reactive and proactive actions in order to reconfigure and harden an Asterisk PBX. Firstly, the platform reacts after certain events by modifying the configuration of the Asterisk PBX in order to mitigate risks. Secondly, the platform performs several on-demand assessments that also reconfigure the Asterisk PBX to improve overall security. Finally, the functionality of the platform is easily extensible and highly customizable. Extensive tests have been carried out to assess the security and performance of the Asterisk PBX when facing attacks. Results show that the security of the platform increases, avoiding performance degradation when using the proposed platform.

Analysis of FXS (Foreign Exchange Subscriber) Port on IPPBX (Internet Protocol Private Branch Exchange)

PBX is a telephone communication connection device that is commonly used in buildings that require a telephone connection. However, some PBX products cannot be directly connected to analog telephones, so they require a module called an S2 module. S2 module can converts the port on the PBX to an FXS port that can be connected to an analog phone. Apart from PBX, there is ITG which can be used as telephone line communication. However, ITG already has an FXS port so it does not require additional modules. In Indonesia, there are standard provisions for the use of analog telephone communication devices which have been regulated in SNI for analog telephones. This research examines analog telephone communication devices according to SNI in Indonesia. The results of this test show the TA400 and MyPBX Standard at the impedance value when the on-hook state gets an average value of 64 K?, when the off-hook condition averages a value of 343 ?, the AC voltage test when the call comes on average gets a value of 343 ?. a value of 60 VAC, which means that it meets the SNI standard.

Initial setup of PBX server based on Asterisk

The development of information technology is very dynamic, in particular, actively developing computer networks, which are increasingly used for telephone conversations. Recently, there has been increased interest in IP-telephony technologies, in other words PBX, the use of which can significantly reduce the cost of telephone communication within the company. PBX (Private Branch exchange) is a system of devices that provides automatic connection and support of telephone communication between subscribers of this PBX, who use special end devices — telephones. A virtual PBX is a powerful telephone system that uses an Internet connection as opposed to standard telephone services. A standard PBX is used to transfer calls from the Internet to a public telephone switching network. Virtual PBX can be considered as a more economical version, because no equipment is involved, everything is virtual and hosted by the service provider. Currently, the open communication platform Asterisk occupies almost 85% of the open source PBX market. The Asterisk automatic telephone exchange supports both IP-telephony protocols and traditional communication lines. All basic and advanced PBX functions are supported: voice menu, call recording, call statistics, voicemail, queuing and operator distribution. Video communication is directly supported. The latest versions of Asterisk support call encryption. Asterisk has simple and well-documented interfaces for integration with other systems, making it easy to embed communications in business processes and business applications. There are a large number of various graphical tools for administering Asterisk, both paid and free, among which the most popular is the free WEB interface FreePBX.

Performance of Various VoIP Vocoders using Wireshark with Asterisk PBX

A private branch exchange (PBX) is implemented by an Asterisk software. In conjunction with appropriate telecommunication hardware interfaces and network applications, Asterisk is employed to establish and manage the telephone calls between telecommunication endpoints, like customary telephone sets, destinations on the general public switched telephone network (PSTN), and devices or services on voice over internet Protocol (VoIP) networks. A Vocoder may be a system of coders and encoders that is employed to scaleback the bandwidth over the restricted use of bandwidth necessities and restricted capability channels in real time needs. This paper presents Performance of Various VOIP Vocoders using wireshark with Asterisk PBX.

Learning by Doing: A Laboratory Based Training Course on Dispatching Communication System

Communication technology plays a critical role in modern power grids. Electric utility personnel need to upgrade their professional skills on communication technology through training. Dispatching communication system is an important integral part of electric power communication systems. This paper presents a laboratory based training course on the topic of dispatching communication system in State Grid Technology College (SGTC). The paper describes the objective of developing the laboratory based training course, the equipments and components of the laboratory, and training projects based on the laboratory environment. The proposed laboratory consists of IP-based soft-switch and TDM-based private branch exchange (PBX) in a hybrid TDM/IP network. Hierarchical training programs have been developed by using the laboratory scenario as real work place. Hands-on laboratory projects have been developed to help the trainees experience configuration and maintenance of equipment and software that is the same as in industrial fields. The proposed training course has provided trainings and evaluations to novice employees of State Grid Corporation of China (SGCC) for 5 years and the feedback is good. Continuous revision of the laboratory and projects will be made according to the evolvement of the technical field in electric power communications.

Optimizing Branch Telephone Networks for Campus VoIP with Mobile Clients

During working hours, employees on campus are not always in their room because of other activities in other rooms both in one building and in different buildings. In this study, the development of a branch telephone communication network or private branch exchange (PBX) uses voice over internet protocol (VoIP) technology with a mobile-based client device and utilizes the internet as a media. For system design, network development life cycle (NDLC) method is used where VoIP communication network is monitored with paessler router traffic grapher (PRTG) software to see quality of service (QoS) values with packet loss, delay, and jitter parameters. The results of the monitoring of each parameter are of perfect average which can be seen from the amount of packet loss value of 0%; delay below 150 msec for sending data packets from the transmitter to the receiver; and jitter in a proper category with a time below 75 msec. However, for better development, the installation and configuration of servers that have been created virtually can be implemented on the actual server system; IP usage which is devoted to VoIP communication networks; bandwidth management to provide a separate traffic line for the VoIP communication network that is created.

VoIP QoS Analysis over Asterisk and Axon Servers in LAN Environment

Voice over IP (VoIP) is a developing technology and a key factor in both the emerging cyberspace engineering and also an accomplishment to set up its position in the telecom industry. VoIP technology is based on internet technology; where data packets switching system is used rather than circuit switching. Whereas, an analog signal is changed over into the digital signals in the full-duplex transmission. VoIP technology is replaced with the conventional public switched telephone network (PSTN) system due to the high flexibility and low-cost. The purpose of this research work is to deliberate experimental and computational performance in the view of quality of service (QoS) parameters of VoIP over local area network (LAN) network. The VoIP systems implementation is based on two different operating system framework (Linux and Windows), whereas, Linux-based and Windows-based private branch exchanges (PBXs), such as Asterisk (Linux-open source) and Axon (window-close source) are configured, installed and verified. QoS factors (such as packet loss, delay, jitter, etc.) are observed over the Asterisk and Axon PBXs in a LAN domain with the assistance of Paessler switch activity grapher (PRTG) monitoring tool. The validations of results are looked at for QoS parameters crosswise over both PBXs with data load (i.e., file transfer and HTTP traffic) during VoIP calls. The productivity and execution of Axon and Asterisk have been equated and analyzed over experimental based outcomes.

IP Telephony Applicability in Cloud Computing

This paper carries out a research related to the applicability of VoIP over Cloud Computing to guarantee service stability and elasticity of the organizations. In this paper, Elastix is used as an open source software that allows the management and control of a Private Branch Exchange (PBX); and for developing, it is used the services given Amazon Web Services due to their leadership and experience in cloud computing providing security, scalability, backup service and feasibility for the users.

Unjuk Kerja IP PBX Asterisk dan FreeSWITCH pada Topologi Bertingkat di Jaringan Kampus

Internet Protocol-based Private Branch Exchange (IP PBX) is needed to interconnect/switch calls between VoIP communication devices in a Local Area Network (LAN). VoIP service can be provided by using IP PBX in data/IP networks that are already provisioned. We conduct this research to evaluate VoIP performances of two IP PBXs using Asterisk and FreeSWITCH. We design an experimental network architecture that is adapted from the hierarchical topology in a Campus Area Network (CAN) at the research location that consists of core switch, distribution switch, and access switch. The two IP PBXs are placed at different locations in the hierarchy of the network topology for investigating the effects of the placement to the VoIP performance. This experimental concept can be used as a base for designing architectures of centralized and distributed IP PBXs in campus network. We measure VoIP performance by evaluating the systems with the Quality of Service (QoS) and the Quality of Experience (QoE) parameters. We also monitor processor and memory consumptions that are used by each VoIP server software when communication takes place. The evaluation was conducted on VoIP system with phone-to-phone scenario in the experimental network that is connected to the active campus network. Our results show that IP PBX placement at different hierarchy of the network topology affects to the VoIP performance particularly on Asterisk IP PBX. The performance of FreeSWITCH IP PBX in terms of QoS and QoE is slightly better than the Asterisk one on average latency/delay, jitter, Mean Opinion Score (MOS), and memory consumption. The values are 41,012 ms, 0,060 ms, 5, 1 % for IP PBX 1, and 41,016 ms, 0,066 ms, 5, 0,5 % for IP PBX 2.

Global experimental verification of Docker-based secured mVoIP to protect against eavesdropping and DoS attacks

The cloud-computing paradigm has been driving the cloud-leveraged refactoring of existing information and communications technology services, including voice over IP (VoIP). In this paper, we design a prototype secure mobile VoIP (mVoIP) service with the open-source Asterisk private branch exchange (PBX) software, using Docker lightweight virtualization for mobile devices with the immutable concept of continuous integration and continuous deployment (CI/CD). In addition, the secure mVoIP service provides protection against eavesdropping and denial-of-service (DoS) attacks, using secure voice coding and real-time migration. We also experimentally verify the quality of the secure voice and the associated communication delay over a distributed global connectivity environment to protect against eavesdropping and real-time migration to mitigate DoS attacks.