XVB - VirtualPBX ( http://virtual-pbx.ru/main.html )

Multi Tenant PBX Platform

The virtual-pbx application is designed for processing incoming/outgoing calls in an isolated environment (numbered plan, routing calls, phones, cdrs, web gui and so forth. ) for multiple users.

Main features:

Processing incoming / outgoing calls.
Completely isolated environment for different users ( incoming / outgoing routes, 
dial plan, sip-endpoints, web-interface, cdrs, call-recordings, etc ).
Custom greetings support.
Email/Twitter notifications.
Multiple language voice prompts.
Text To Speech ( TTS ) for multiple languages..
'Simple' or 'Expert' mode for configuration.
Custom music on hold (MOH) for each user.
Multiple language WEB interface with xml/json API support.
Flexible customisation for system voice messages.
Managing voice mail via phone or WEB interface.
User specified time zones support.
Call transfer.
Call pickup.
White / Black lists support for each IVR item.
Journal configuration changes.
Call Detail Record ( CDR ).
XML backup / restore configuration.
Multiple roles within a single account.
Privated / Shared DIDs.
SQL reports.
Management API.
Google Calendar integration.
Support Google Analytics for calls trekking.
Radius accounting.
Background music for Find-Me / Queues.
Support for wideband / HD audio codec ( g722 ).
Multiple Themes.
Custom branding.
Recording outgoing calls ( auto / on demand ).
Full DTMF history for each call.
Support presettings for SIP providers.
Support Multi-tenant asterisk with Kamailio as sip registrar server / load balancer.
FMC - Fixed Mobile Convergence / Call transfer without breaking the call.
Google-chart for extended statistics.
WEB logon / logoff for the agents of the queue.
Click2Call API
Several types of extensions:
    VoiceMail
    DialOut with Find-Me feautures.
    Company Directory
    Schedule
    WEB-Request
    Chat-Room ( with IceCast broadcast )
    Fax2Email
    DTMF2Email
    Polling ( Voting )
    DISA
    Podcast2Phone gate
    ACD Queues
    CallBack
    DateTime
    Fax on Demand / Web Fax
    Bulletin board system
    CallBlast ( Predictive Dialer )
    WEB Variables
    Stored DB variables
    Goto If
    Alarm clock ( Telephone Reminder / Wake Up )
    Google Calendar - Shedule
    RoboTEXT with support money, date, time, phonenumber, percent, degree formats
    MP3 Streaming
    Call Parking
    GoogleCalendar - Events: reads events via TTS + confirmation / cancellation of events.*
    Paging / Intercom
    Play DTMF Tones
    MultiDialout

(exported from code.google.com/p/virtual-pbx)