Setting up a quick OCS 2007 test environment
Perhaps virtualised for testing?
Physical HW is obviously better
Two W2k3 or W2k8 boxes
Configure TCPIP appropriately on the two machines so they can chat using static IPs
Name machines appropriately
Promote one to a DC
DC is a DNS server
Install CA services on the CA
On OCS server install OCS 2007 Standard Edition, this will give a good test bed on minimum machines (assuming this is for repro/testing only!)
Install IIS as per prompt in OCS wizard
Install AD tools as per prompt in OCS wizard
This will install SQL and all the necessary components
When installed and the services are strarted the Monitoring service may not start, if not you may need to install the Message Queuing Feature
Start the relevant services
Install Admin tools as per OCS setup Wizard
Create a couple of users, Enable them for OCS
Use the Validation wizard to do some testing, they should be able to sign in
Install OCS client
Set to Manual Config and point to the OCS server (FQDN) and set to TLS
For Auto sign in and other DNS records necessary watch this nice little video... https://technet.microsoft.com/en-us/office/ocs/dd221358.aspx
Setup your DNS entries and you should now be able to autosign in!