Cisco Cisco TelePresence Video Communication Server Expressway
Appendix 14 – Cisco VCS and Microsoft OCS Director
Appendix 14 – Cisco VCS and Microsoft OCS
Director
Director
Background
Microsoft recommends that OCS Director is deployed when an organization hosts multiple Standard
Edition Servers or Enterprise pools.
Edition Servers or Enterprise pools.
Microsoft OCS Director accesses the AD domain controllers for the whole network and can therefore
both authenticate incoming requests, and also directs them to the appropriate enterprise pool or
Standard edition server.
both authenticate incoming requests, and also directs them to the appropriate enterprise pool or
Standard edition server.
If a Director is not used, calls will use up resources on the Enterprise pool or Standard Edition Server
that the call is initially received on, as that device will proxy the call to the correct home pool / server
(remaining in-line). Not using Director thus uses resources on two devices rather than just the one and
so affects the maximum capacity that the deployment can support.
that the call is initially received on, as that device will proxy the call to the correct home pool / server
(remaining in-line). Not using Director thus uses resources on two devices rather than just the one and
so affects the maximum capacity that the deployment can support.
Enterprise pools use Hardware Load Balancers (HLBs) to balance traffic across Front End Processors
within that Enterprise Pool.
within that Enterprise Pool.
When handling a Register request, Director matches the source caller to their home Pool / standard
edition server and uses a 301 response (permanently moved) to the initiator of the message to make
them route this and future messages for this caller to the correct Pool / standard edition server.
edition server and uses a 301 response (permanently moved) to the initiator of the message to make
them route this and future messages for this caller to the correct Pool / standard edition server.
Cisco VCS Deployment Guide: Microsoft OCS 2007 R1 and R2 and Cisco VCS X5.2
Page 89 of 92