From NCH Software:
Axon is a virtual IP PBx for Windows PCs featuring a one click installation setup and a web management console that makes configuring your new PBx easy. Implement a scalable PBX solution with an existing PC which connects to phone lines and extensions using VoIP technology for your business or home. Offering all the normal features of a traditional PBX such as allowing internal or external calls and more advanced call queuing for call centers. Features: * Manages telephone calls within a business or home. * Routing of calls is digital over the computer network. * Unlimited number of extensions or external lines. * Supports standard PBX features like call transfer, hold, and record. * Includes a call queue sequencer with voice prompting. * Intergrates with the IMS on-hold music & messages player. * Auto configures extensions for the IVM Call Attendant and VRS call recorder. * Uses the open SIP standard for signalling (RFC 3261) to work with a broad range of SIP compatible phones and other devices. * Works with IP phones that plug into the LAN (eg. Linksys) * Works with softphones (eg. the Express Talk Softphone) to make calls through your computer. * Works with USB phones plugged into your computer. * If no VoIP services are available, can link to ordinary external lines with FXO adapters. * Automatic "one-click" installer to setup the PBX in just minutes. * Configuration, such as adding extensions, can be done remotely through your internet browser.