Asterisk is a free, open-source framework for building communications applications and is sponsored by Sangoma. Asterisk turns an ordinary computer into a communications server. Asterisk powers IP PBX systems, VoIP gateways, conference servers, and other custom solutions. It is used by small businesses, large businesses, call centers, carriers, and government agencies, worldwide. What Can You … Read more
Today, In this article we will know how to Asterisk Installation on centos 8 or a RedHat-based system. Know more about asterisk installation Installation and configuration of WebRTC with asterisk on Amazon What New in Asterisk 16 Step 1: Updating system Update your system before installing Asterisk. After updating set SELinux in permissive mode by … Read more
What New in Asterisk 16 One of the major improvement in asterisk 16 from the earlier version is the WEBRTC, Text Messaging in Conference, Wrap up time in queue, Originate function and PJSIP Also there is one major changes regarding macro application being used in dialplan. Applications: The ‘Macro’ dialplan application has been deprecated and is no … Read more
SDP – Session Description Protocol What means SDP? Session Description Protocol, a communication protocol for describing multimedia sessions Single-dealer platform, software used in financial trading. Sockets Direct Protocol, a low-level remote-computing protocol. Software Defined Perimeter, also called “Black Cloud”, an approach to computer security. It is used to describe multimedia sessions in a format understood by … Read more
SIP Headers – Compact Form Many common SIP header fields have a compact form where the header field name is denoted by a single lower case character. Some examples are given below − Header Compact Form To T Via V Call-ID I Contact M From F Subject S Content-Length I Here is the list of … Read more
G.729 codec G.729 is a codec with low bandwidth requirements; it provides good audio quality. The codec encodes audio in frames of 10 ms long. Given a sampling frequency of 8 kHz, a 10 ms frame contains 80 audio samples. The codec algorithm encodes each frame into 10 bytes, so the resulting bitrate is 8 … Read more
G.711 Codec G.711 is a codec that was introduced by ITU in 1972 for use in digital telephony. The codec has two variants: A-Law is being used in Europe and in international telephone links, uLaw is used in the U.S.A. and Japan. G.711 uses a logarithmic compression. It squeezes each 16-bit sample to 8 bits, thus it achieves a … Read more
Basic Call Flow – SIP Key terms used in SIP: It is important to familiarize with these terms in order to understand basic SIP call flow. Here are few of them: Call flow: It’s a flow diagram of SIP messages — shows an ideal way how a media session carried over two endpoints. Its a … Read more
SIP : Session Initiation Protocol Session Initiation Protocol (SIP) is one of the most common protocols used in VoIP technology. It is an application layer protocol that works in conjunction with other application layer protocols to control multimedia communication sessions over the Internet. SIP Endpoint Communication What is VoIP Technology Before moving further, let us … Read more
SIP – Headers A header is a component of a SIP message that conveys information about the message. It is structured as a sequence of header fields. SIP header fields in most cases follow the same rules as HTTP header fields. Header fields are defined as Header: field, where Header is used to represent the header … Read more