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
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
What is command and how it works? One of Asterisk’s most valuable features is its ability to connect different callers to each other. This is especially useful when callers are using different methods of communication. For example, caller A might be communicating over the traditional analog telephone network, while user B might be sitting in … Read more
Asterisk channel variable DIALSTATUS Contains a text string signifying result of the last dial attempt: ANSWER: Call is answered. A successful dial. The caller reached the callee. BUSY: Busy signal. The dial command reached its number but the number is busy. NOANSWER: No answer. The dial command reached its number, the number rang for too … Read more
; extensions.conf – the Asterisk dial plan ; ; Static extension configuration file, used by ; the pbx_config module. This is where you configure all your ; inbound and outbound calls in Asterisk. ; ; This configuration file is reloaded ; – With the “dialplan reload” command in the CLI ; – With the “reload” … Read more