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linux voip server

Asterisk is an open source and free software implementation of a telephone PBX VoIP solution. Asterisk offers features such as:
=> Voice-over-Internet protocol (VoIP)
=> Voice mail
=> Conference calling
=> Interactive voice response i.e. phone menus
=> Automatic call distribution
=> Custom programming in C or Perl using AGI

From the article:

Voice over Internet Protocol (VoIP) has emerged as a popular technology for modern voice communications. Many organizations have replaced their analog or proprietary digital telephone systems with VoIP-based solutions. This allows the consolidation of telephone services into an existing IP infrastructure. In addition, using IP to host voice services lets the organization leverage existing expertise–while retaining all of the network’s management advantages. Though not without its disadvantages, VoIP provides a compelling option to those looking for a telephone solution.
This article will present a simple VoIP solution using Asterisk, an open source private branch exchange (PBX) product. It will show you how to install Asterisk, configure it using its LDAP backend, and connect to it using the Ekiga software VoIP client and a Cisco 7900 Series VoIP telephone to make calls.

=> Open source telephony: a Fedora-based VoIP server with Asterisk

Asterisk PBX (private branch exchange) is an open source telephone system. Like any PBX, it allows a number of attached telephones to make calls to one another, and to connect to other telephone services including the public switched telephone network (PSTN).

Setting up Asterisk is considered as a difficult task. Building a VoIP Linux server with Asterisk is easy with AsteriskNOW software, which can setup Asterisk in minutes:

AsteriskNOW is an open source Software Appliance; a customized Linux distribution that includes Asterisk (the leading open source telephony engine and tool kit), the AsteriskGUI, and all other software needed for an Asterisk system. AsteriskNOW is easy to install, and offers flexibility, functionality and features not available in advanced, high-cost proprietary business systems.

How to: Setup Asterisk PBX Easily with AsteriskNOW in 30 minutes

Download AsteriskNow

Overall I'm quite impressed with this project as it provides:
=> Ease of use
=> Ease of installation
=> GUI Wizards
=> Open source project

==> Visit official AsteriskNow project home page.