VoIP Architecture
Microsoft Office Communications Server 2007 and Microsoft Office Communications Server 2007 R2 will reach end of support on January 9, 2018. To stay supported, you will need to upgrade. For more information, see Resources to help you upgrade your Office 2007 servers and clients.
The following sections discuss the components and architectures involved with Voice over IP (VoIP) features in Office Communications Server 2007 R2: