Openfire 3.6.3 connect to Microsoft OCS 2007

The company I work for recently acquired a company running Microsoft OCS 2007. We have a two-way forest to forest transient trust between the two companies over a wide open VPN tunnel. We’ve been running Openfire 3.6.3 for a few years that was built and deployed by a previous engineer that is no longer with us. I unfortunately don’t have a lot of experience and knowledge with this deployment

Can anyone provide me some guidance on how I would setup the OCS instance with company A to work with my Openfire instance? I would like to be able to add people from the OCS instance into my Openfire spark client and visa versa. I need a fairly comprehensive ‘step by step’ guide if you will that will help me get this working.

Any assistance and guidance would be greatly appreciated.

There are quite a few threads on this forum about this very topic!