Based on my research and my review of MacRumors forum posts, I know that Asterisk is an open source options for PBX systems on a Mac Server. But, does anyone know of any company providing a commercially supported Mac Server-based PBX solutions? Even if it is Asterisk-based, having a commercially supported system is important to many businesses. At a previous employer, I used the PC-based Televantage software (6 years go) and I found it to be a great product. But, there is no Mac Server or Mac Client support. Preferably, such a solution would have a Mac Client GUI for voicemail inbox, etc. Any other ideas?