Microsoft® Office Communications Server 2007 R2 Resource Kit

Examining Technical Details Behind Dual Forking Scenarios

Dual forking takes its name from the concept of forking; an incoming call is routed simultaneously to multiple destinations. The dual in this term refers to the fact that for each incoming call, both Office Communications Server and the PBX fork the call not only to their own endpoints but also send the call to each other. This is shown in Figure 10-5.

Figure 10-5. Dual forking topology

In Figure 10-5, two users—user A and user B—are configured for dual forking. Each user has a PBX phone and Office Communicator. When user A calls user B, the call is "forked" to both the PBX and Office Communications ...