Voice

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Voice systems provide full PBX capability including features like call handling, VoIP, voicemail, voice response, faxing, call transfers and many other features. Want to read more about Voice over Internet Protocol (VoIP) ?

Asterisk is a software implementation of a telephone private branch exchange (PBX) originally created in 1999 by Mark Spencer of Digium. Like any PBX, it allows attached telephones to make calls to one another, and to connect to other telephone services including the public switched telephone network (PSTN) and Voice over Internet Protocol (VoIP) services.
The Asterisk software includes many features available in proprietary PBX systems: voice mail, conference calling, interactive voice response (phone menus), and automatic call distribution.

Elastix is an appliance software that integrates the best tools available for Asterisk-based PBXs into a single, easy-to-use interface. It also adds its own set of utilities and allows for the creation of third party modules to make it the best software package available for open source telephony.

Elastix is an open source Unified Communications Server software that brings together IP PBX, email, IM, faxing and collaboration functionality. It has Web interface and includes capabilities such as a Call Center software with predictive dialing. The Elastix functionality is based on open source projects as Asterisk, HylaFAX, Openfire and Postfix. Those packages offer the PBX, fax, instant messaging and email functions, respectively.
OpenSER (Open SIP Express Router) is a high-performance, configurable, Open Source, SIP ( RFC3261 ) server which can connect, authenticate, and route calls from SIP phones. It has the advantage of having a very small footprint and being quite efficient which makes it ideal for use on Linksys routers. It also means that each wireless node can route local calls directly from phone to phone without needing to refer them to a central server. sipX ECS (Enterprise Communications Server) is an open source voice over IP telephony server. sipX includes many features of a traditional private branch exchange (PBX) like voice mail, interactive voice response systems, auto attendants and the like. The main components of the system is a SIP switch or router around which sipX is designed. In contrast to its main open source competitor Asterisk PBX and most commercial offerings that use SIP as a transport protocol, SipX does not play the role of a back-to-back user agent. This approach led to a modular and highly scalable system.