Understanding Pbx (Private Branch Exchange)

PBX (private branch exchange) is a private central with features such as a public central that is used by an institution / company in serving the company’s internet communications.

A. Picture of Voip Diagram and Pbx (Private Branch Exchange) Communication Parts

B. Pbx (Private Branch Exchange) Server Softswitch Work Process

An IP PBX system consists of one or more SIP phones, an IP PBX server and optionally a VOIP Gateway to connect to an existing PSTN line. The function of an IP PBX server is similar to how a proxy server works: SIP clients, either software (softphone) or mobile-based hardware, register with the IP PBX server, and when they want to make a call they request the IP PBX to make the call. The IP PBX has a list of all mobiles/users and their SIP-compliant addresses and thus can connect internal calls or route external calls either through a VOIP gateway or VOIP service provider.

C. The Concept And Process Of Voip With Pbx Communication

The working principle of VoIP is to change the analog voice obtained from the speakers on the computer into digital data packets, then from the PC it is forwarded through the Hub / Router / ADSL Modem sent via the internet network and will be received by the destination through the same media. Or it could be through telephone media that is forwarded to a phone adapter that is connected to the internet and can be received by the destination phone.

For sending a signal to a remote destination, it can be done digitally, that is, before sending the data in the form of an analog signal, it is converted into digital data with ADC (Analog to Digital Converter), then transmitted, and at the receiver it is restored to analog data with DAC (Digital to Analog). converters). Likewise with VoIP, voice digitization in the form of data packets, is sent and recovered in the form of voice at the receiver. Digital formats are easier to control, in this case they can be compressed, and can be converted to better formats and digital data is more resistant to noise than analog.

The simplest form of a VoIP system is two computers connected to the internet. The basic requirements for establishing a VoIP connection are a computer that is connected to the internet, has a sound card that is connected to speakers and a microphone. With the support of special software, both computer users can be connected to each other in a VoIP connection. The form of the relationship can be in the form of exchanging files, sounds, images. The main emphasis in VoIP is the connection between the two in the form of voice.

In its development, VoIP connection system has evolved. The form of equipment has also developed, not only in the form of interconnected computers, but other equipment such as ordinary telephones connected to the VoIP network. A digital data network with a gateway for VoIP allows connecting to a PABX or a regular analog telephone network. Communication between computers and planes (extension) in the office is possible. The form of communication is not just voice. Can be in the form of writing (chat) or if the network is large enough it can be used for Video Conference. In a more advanced form of communication, it is better known as IP Telephony which is a form of multimedia communication as a continuation of the form of voice communication (VoIP). The flexibility of VoIP in the form of networks, equipment and communication media makes VoIP quickly popular in the general public.

D. The Concept And Process Of Voip With Pbx Communication

The working principle of VoIP is to change the analog voice obtained from the speakers on the computer into digital data packets, then from the PC it is forwarded through the Hub / Router / ADSL Modem sent via the internet network and will be received by the destination through the same media. Or it could be through telephone media that is forwarded to a phone adapter that is connected to the internet and can be received by the destination phone.

For sending a signal to a remote destination, it can be done digitally, that is, before sending the data in the form of an analog signal, it is converted into digital data with ADC (Analog to Digital Converter), then transmitted, and at the receiver it is restored to analog data with DAC (Digital to Analog). converters). Likewise with VoIP, voice digitization in the form of data packets, is sent and recovered in the form of voice at the receiver. Digital formats are easier to control, in this case they can be compressed, and can be converted to better formats and digital data is more resistant to noise than analog.

The simplest form of a VoIP system is two computers connected to the internet. The basic requirements for establishing a VoIP connection are a computer that is connected to the internet, has a sound card that is connected to speakers and a microphone. With the support of special software, both computer users can be connected to each other in a VoIP connection. The form of the relationship can be in the form of exchanging files, sounds, images. The main emphasis in VoIP is the connection between the two in the form of voice.

In its development, VoIP connection system has evolved. The form of equipment has also developed, not only in the form of interconnected computers, but other equipment such as ordinary telephones connected to the VoIP network. A digital data network with a gateway for VoIP allows connecting to a PABX or a regular analog telephone network. Communication between computers and planes (extension) in the office is possible. The form of communication is not just voice. Can be in the form of writing (chat) or if the network is large enough it can be used for Video Conference. In a more advanced form of communication, it is better known as IP Telephony which is a form of multimedia communication as a continuation of the form of voice communication (VoIP). The flexibility of VoIP in the form of networks, equipment and communication media makes VoIP quickly popular in the general public.

E. Pbx Communication Part Needs On Softswitch Server

1. Media Gateway Controller (MGC) or Call Agent

MGC or Call Agent is the main element of the softswitch, functions to control all service and communication sessions, regulate the interaction of other network elements, and bridge networks with different characteristics, including PSTN, SS7, and IP networks.

2. Signaling Gateway (SG)

The signaling gateway (SG) creates a bridge between the SS7 network and the IP network under the control of MGC. The SG only handles SS7 signaling, while the MGC handles the voice circuits built by the SS7 signaling mechanism.

3. Media Gateway (MG)

The media gateway functions as a transport element to route traffic in the softswitch network and also sends or receives traffic from other different networks, such as PSTN, PLMN, VoIP H.323, and subscriber access networks. Media gateway is divided into trunk gateway and access gateway

  • Trunk gateway is a media gateway that performs media functions for class 4 softswitches, which is to route traffic from the PSTN/PLMN network (mobile network).
  • Access gateway is a media gateway that performs media functions for class 5 softswitches to connect softswitches with corporate networks or customer terminals (CPE).

4. Media Server

The media server performs its function, namely, to enrich the softswitch with media capabilities. If needed, it will support digital signal processing (DSP). For example, to respond to voice responses, the task will be carried out by the media server. Media Video will also be served by a Media Server when applicable. Media access is the media used by the softswitch network to reach customers. Media access can use cable modem, leased circuit, v.52, DSL, HFC, and radio access.

5. Server Features

To provide facilities or services such as billing, multi-party conferencing, etc. The feature server uses the resources and services associated with the other components of the softswitch. Example: gatekeeper, etc.

6. Operating support system (OSS)

Is a network element that functions to support network operation and maintenance, such as network management, provisioning, billing, monitoring, statistics, etc.

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