You need additional roles and services to complete the Office Communications Server 2007 R2 deployment. For a complete list of components required for deployment, see Determining Your Infrastructure Requirementsin the Planning and Architecture documentation.

Active Directory Domain Services.In this walkthrough, we assume a single Active Directory forest with a single domain. We also assume that the forest and domain are controlled by the Windows Server 2008 operating system. The final assumption is that the domain controller hosts a certification authority (CA) and a Domain Name System (DNS) service. Additionally, Active Directory Domain Administrator tools are installed during deployment.

Certificates (PKI).Office Communications Server 2007 R2 requires a public key infrastructure (PKI) to support Transport Layer Security (TLS) and mutual TLS (MTLS) connections. By default, Office Communications Server 2007 R2 is configured to use TLS for client-to-server connections. Office Communications Server 2007 R2 uses MTLS for connections between servers. External connections are secured by Secure Sockets Layer (SSL).

Domain Name System (DNS).Domain Name System (DNS) is required by Office Communications Server and Communicator Web Access. Office Communications Server uses DNS to do the following:

  • Discover internal servers or pools for server-to-server communications.

  • Allow clients to discover the Standard Edition server that is used for various Session Initiation Protocol (SIP) transactions.

  • Allow external servers and clients to connect to Edge Servers or the HTTP reverse proxy for instant messaging (IM) or conferencing content.

Reverse Proxy.A reverse HTTP proxy is required for Edge Server topologies in the perimeter network to support Web conferencing and other features for external users. Because different reverse proxy servers are configured in different ways, this walkthrough does not discuss the detailed steps for setting up a reverse proxy server. For details, see the documentation for your reverse proxy server.

Internet Information Services (IIS).Several Office Communications Server 2007 R2 components require Internet Information Services (IIS). The following versions of IIS are supported for Office Communications Server:

  • IIS version 6.0 running on Windows Server 2003

  • IIS version 7.0 running on Windows Server 2008 in IIS 6.0 compatibility mode

Network Protocols.Only IPv4 addresses and networking protocols are supported in Office Communications Server. The dual stack is supported, but IPv6 protocols alone are not supported.