3CX Phone System is a software-based IP PBX for Windows which replaces traditional PBX hardware phones. It is based on the SIP standard and supports standard SIP software / hardware phones. It allows calls to be made via a VOIP service provider or via the regular PSTN. Easy to install and configure, it includes a web-based configuration interface, voice mail, auto attendant, call hunting and other features. Both commercial and a free edition are available.
nexVortex Voice-over-IP SIP Trunking
Traditionally, phone systems like PBXs have connected to the outside world using phone lines or T1s. Now there’s a better solution – SIP Trunking. Moving to SIP Trunking gives you greater control, more flexibility and will save you money.
nexVortex SIP Trunking services allow businesses to sever the tie to the old world phone network and make VoIP phone calls directly from an IP PBX or similar VoIP enabled device.