Asterisk PBX

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Asterisk PBX

Open source PBX software that runs under Linux and other Unix variants on a variety of hardware, including x86, PowerPC, POWER and Xscale. Supporting traditional telephony (TDM) as well as voice over IP (VoIP), Asterisk is written in C and uses the Unix standard POSIX programming interface to communicate with the operating system.

The IAX Protocol
Asterisk uses its proprietary Inter-Asterisk Exchange (IAX) protocol to initiate calls and send the data. Supporting any type of codec, IAX can be used for video as well as VoIP. All signaling and data ride in UDP packets, and IAX can multiplex multiple data streams between servers (port aggregation).

From Digium Et Al
Developed by Mark Spencer of Digium, Inc. (www.digium.com) and maintained by the company along with the Asterisk community (www.asterisk.org), a version for Windows that supported only VoIP was developed as a community project, but "AstWind" was later abandoned. Digium also offers a variety of analog and digital telephony interface cards that plug into PCI slots.
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References in periodicals archive ?
323, este trabajo se enfocara en los protocolos SIP e IAX, los cuales, como se ve en la figura, son protocolos de inicio de sesion.
Los dos objetivos principales del proyecto IAX derivaran de la experiencia con los protocolos de VoIP como el SIP y el MGCP (Media Gateway Control Protocol) para control y el RTP y flujo multimedia y son [3]:
IAX es un protocolo de media y senalizacion punto a punto, cuyo fundamento es el de la multiplexacion de la senalizacion y multiples flujos sobre una unica asociacion UDP entre dos usuarios finales [9].
Asimismo, IAX utiliza el puerto UDP 4569 para comunicar todos los paquetes, usando para tal fin un campo de llamada de 15 bits dentro de la cabecera del protocolo, para multiplexar los flujos sobre una unica asociacion UDP [3].
La implementacion conocida como IAX Trunked permite que el protocolo use una unica cabecera para el pasaje de varias llamadas, es decir, que es posible enviar varias conversaciones por el mismo flujo, lo cual supone un importante ahorro de ancho de banda, ya que con esto se evita el overhead de las capas IP y transporte UDP excesivo.
69) Brissenden notes how Harington's Metamorphosis of A IAX had already aroused the displeasure of the queen and that, since its publication, Sir John Harington had become popularly known as "Sir Ajax.
was a deliberate echo of the title of The Metamorphosis of A IAX and second that he intended it to be recognized as such.
Subsequently it appears both as AIAX and A IAX (for example at B 4v, B 5, D 5, D 8v as well as the header on F 6, etc.
The author presents the ways in which IAX can be activated so as to avoid complications such as NAT and the presence of intermediary boxes in operational architectures.
Analyses the capabilities of the IAX protocol and its ability to meet VoIP service provider requirements, and provides scenarios of introducing IAX within operational architectures
Addresses the advantages and disadvantages of SIP, and Details the features of IAX that can help, in junction with SIP, to overcome various disadvantages of SIP
Explores the added values of IAX protocol compared to existing protocols