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IAX is the Inter-Asterisk eXchange protocol used by Asterisk, an open source PBX server from Digium. It is used to enable VoIP connections between Asterisk servers, and between servers and clients that also use the IAX protocol. It has been suggested that this article or section be merged with protocol (computing). ... Asterisk is a free software / open-source software implementation of a telephone private branch exchange (PBX). ... PBX redirects here. ... This article or section does not cite its references or sources. ... This article is about Digium, Inc. ... IP Telephony, also called Internet telephony, is the technology that makes it possible to have a telephone conversation over the Internet or a dedicated Internet Protocol (IP) network instead of dedicated voice transmission lines. ...


IAX now most commonly refers to IAX2, the second version of the IAX protocol. The original IAX protocol has been deprecated almost universally in favor of IAX2. In computer software standards and documentation, deprecation is the gradual phasing-out of a software or programming language feature. ...

Contents

Basic properties

IAX2 is a very robust and full-featured yet simple protocol. It is agnostic to codecs and number of streams, meaning that it can be used as a transport for virtually any type of data. This capability will be useful as videophones become common. A Codec is a device or program capable of performing encoding and decoding on a digital data stream or signal. ... It has been suggested that Visiophone be merged into this article or section. ...


IAX2 uses a single UDP data stream. usually on port 4569, to communicate between endpoints, both for signaling and data. The voice traffic is transmitted in-band, making IAX2 easier to firewall and more likely to work behind network address translation. This is in contrast to SIP, which uses an out-of-band RTP stream to deliver information. The User Datagram Protocol (UDP) is one of the core protocols of the Internet protocol suite. ... In information theory, a signal is the sequence of states of a communications channel that encodes a message. ... In telecommunications, in-band signaling is the sending of metadata and control information in the same band, on the same channel, as used for data. ... Please wikify (format) this article or section as suggested in the Guide to layout and the Manual of Style. ... In computer networking, the process of network address translation (NAT, also known as network masquerading or IP-masquerading) involves re-writing the source and/or destination addresses of IP packets as they pass through a router or firewall. ... The three letter abbreviation SIP can refer to the following: Computing/Engineering Session Initiation Protocol, an IETF standard relating to VoIP technology Single in-line package for packaging components. ... Out-of-band signaling is telecommunication signaling (exchange of information in order to control a telephone call) that is done on a channel that is dedicated for the purpose and separate from the channels used for the telephone call. ... The Real-time Transport Protocol (or RTP) defines a good standardized packet format for delivering audio and video over the Internet. ...


IAX2 supports trunking, multiplexing channels over a single link. When trunking, data from multiple calls are merged into a single set of packets, meaning that one IP datagram can deliver information for more than one call, reducing the effective IP overhead without creating additional latency. This is a big advantage for VoIP users, where IP headers are large percentage of the bandwidth usage. // In computer networking, trunking describes using multiple network cables or ports in parallel to increase the link speed beyond the limits of any one single cable or port. ... In telecommunications, multiplexing (also muxing or MUXing) is the combining of two or more information channels onto a common transmission medium using hardware called a multiplexer or (MUX). ... // In computer networking, trunking describes using multiple network cables or ports in parallel to increase the link speed beyond the limits of any one single cable or port. ... A packet is the fundamental unit of information carriage in all modern computer networks that use packet switching. ... The Internet Protocol (IP) is a data-oriented protocol used for communicating data across a packet-switched internetwork. ... IP Telephony, also called Internet telephony, is the technology that makes it possible to have a telephone conversation over the Internet or a dedicated Internet Protocol (IP) network instead of dedicated voice transmission lines. ... This article or section does not cite its references or sources. ...


The creation of IAX

The IAX2 Protocol or Inter-Asterisk Exchange Protocol was created by Mark Spencer for Asterisk for VoIP signalling. The protocol sets up internal sessions and these sessions can use whichever codec they want for voice transmission. The Inter-Asterisk Exchange protocol essentially provides control and transmission of streaming media over IP (Internet Protocol) networks. IAX is extremely flexible and can be used with any type of streaming media including video however it is mainly designed for control of IP voice calls. IAX’s design was based on many common control and transmission standards today including Session Initiation Protocol (SIP, which is the most common), Media Gateway Control Protocol (MGCP) and Real-time Transfer Protocol (RTP). Mark Spencer at the 2006 OReilly Emerging Telephony Conference. ...


The goals of IAX

The primary goals for IAX were to minimize bandwidth used in media transmissions, with particular attention drawn to control and individual voice calls, and to provide native support for NAT (Network Address Translation) transparency. Another goal is to be easy to use behind firewalls. Nat Bio Rap name: NAT Label Name: Natalac Records Reasoning behind rap Name: From Nat Turner who led the first slave revolt in the 1800s. ...


The basic structure of IAX is that it multiplexes signalling and multiple media streams over a single UDP (user datagram protocol) stream between two computers. IAX is a binary protocol, designed to reduce overhead especially in regards to voice streams. Bandwidth efficiency in some places is sacrificed in exchange for bandwidth efficiency for individual voice calls. One UDP stream is easier to setup for users that are behind a firewall. The User Datagram Protocol (UDP) is one of the core protocols of the Internet protocol suite. ... The User Datagram Protocol (UDP) is one of the core protocols of the Internet protocol suite. ... Please wikify (format) this article or section as suggested in the Guide to layout and the Manual of Style. ...


IAX clients

The IAXy, a VoIP telephone adaptor that uses the IAX2 protocol. ...

VoIP Providers Supporting IAX

NuFone, Inc. ... This article is being considered for deletion in accordance with Wikipedias deletion policy. ...

External links

  • "IAX: Inter-Asterisk eXchange Version 2" protocol specification (& updates)
  • IANA Registration for IAX Enumservice

  Results from FactBites:
 
IAX - Wikipedia, the free encyclopedia (520 words)
IAX is the Inter-Asterisk eXchange protocol used by Asterisk, an open source PBX server from Digium.
The primary goals for IAX were to minimize bandwidth used in media transmissions, with particular attention drawn to control and individual voice calls, and to provide native support for NAT (Network Address Translation) transparency.
IAX is a binary protocol, designed to reduce overhead especially in regards to voice streams.
  More results at FactBites »

 
 

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