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trixbox CEは、インストールが容易なAsterrisk PBXベースのVOIP電話システムです。trixboxは、自宅やオフィスで使用する目的で設計されています。trixbox CEにはCentOS Linux、Mysql、ビジネス品質の電話システムに必要な各種ツールが含まれています。

Yate is a next-generation telephony engine. While currently focused on Voice over Internet Protocol (VoIP) and PSTN, its power lies in its ability to be easily extended. It supports SIP, H.323, IAX, MGCP, Jingle, Jabber, E1, T1, analogic, robbed bit, ISDN PRI, BRI, and SS7. YateClient is an Instant Messenger and Voice application for Jabber/Jingle IM, SIP, H.323, and IAX VoIP protocols.

Zentyal Server aims at offering small and medium businesses (SMBs) a native drop-in replacement for Windows Small Business Server and Microsoft Exchange Server which can be set up in less than 30 minutes and is both easy to use and affordable.

VoiceOne is a Linux distribution that gives you the ability to install a PBX platform with an easy to use Web-based GUI. It also provides a framework for building a communication server adding various plugins. Its main features are Asterisk 1.8 with realtime configuration with MySQL, a Ubuntu 10.04 base, and support for both hard disk and Compact Flash card installation.

libre is a generic library for real-time communications with asynchronous I/O support. It is written in portable POSIX source code that conforms to the ANSI C89 and ISO C99 standards. It is robust and fast, with a low memory footprint. It also features RFC compliance and support for IPv4 and IPv6. Protocol implementations include SIP, SDP, RTP/RTCP, BFCP, DNS, STUN/TURN/ICE, HTTP, and WebSockets.

OpenSIPS(旧OpenSER)は、GPLライセンスの元に実装している多機能なSIPサーバで、プロフェッショナルなSIPサーバプラットフォームで使用されるハイレベルな技術的ソリューション(パフォーマンス、セキュリティ及び品質)を提供することを目的としています。

EMIPLIB is a library to facilitate the development of programs that need to stream several kinds of media over IP. The library consists of several kinds of components that can be linked together in various ways, thereby providing a flexible framework. It also provides some ready-to-use classes for the transmission of audio and video over IP. Streams originating from the same participant can be synchronized.

AsterClick is a system for developing with Asterisk AMI and HTML5 WebSockets. It is composed of two parts: a server-side middleware and a client-side JavaScript class. The server-side middleware mediates between Asterisk AMI and multiple HTML5 browsers connected via WebSockets. The JavaScript class manages the WebSockets connection and provides methods like addEventListener() and removeEventListener() that take AMI events as parameters. AsterClick does away with browsers polling servers by exploiting the persistent nature of HTML5 WebSocket connections. The communications protocol between client and server is based on XML. Commands can be sent via the JavaScript class using XML strings, XML objects, or JSON objects. A client can connect to multiple Asterisk servers at the same time. The server-side component of AsterClick has hooks for both custom AsterClick commands and server side plugins and related events that all share the same XML stream.