Free Linux IP PBX server software for hosted PBX services and enterprise PBX
BSEditor: 4PSA VoipNow is the leading Integrated Communications System (ICS - the next generation PBX system) for service providers and enterprises. Easy to use and deploy, it runs on x86 based servers and delivers advanced IP telephony services at a very attractive cost of ownership. Download Data Sheet
4PSA VoipNow can be deployed in various working scenarios, to provide hosted VoIP services in high availability xSP environments, Advanced Call Center services or enterprise telephony in organizations of all sizes.

Features:

Multitenant, Four Levels of Control
4PSA VoipNow is the perfect solution for delivering SaaS (Software as a Service) PBX services. Beside the standard PBX features, the software comes with advanced functions and tools designed for VoIP providers, call centers and enterprises: four levels of access, individual permissions and limits, phone provisioning, realtime prepaid and postpaid billing engine, SOAP API for integration with third party applications, server monitoring with automatic intervention, high availability support and much more.
Realtime Postpaid and Prepaid Billing Engine
Realtime postpaid and prepaid billing Service providers know that having an advanced billing engine is the Gateway to success. 4PSA VoipNow implements a reseller friendly billing system, configurable on account level, postpaid and prepaid capable. The billing engine is available to providers resellers and clients, allowing them to scale their business as well. In an enterprise environment, the billing engine is indispensable in tracking operational costs.
Calling Card Deployment Engine
Calling card deployment engine The 4PSA VoipNow calling card management features help providers extend their business to new areas. The calling card engine can be controlled from remote applications through the SOAP API, making automation a breeze. Calling card features are also very useful in enterprise environments, as they can dramatically reduce communication costs. you can free download 4PSA VoipNow 1.6.4 now.