You cannot connect to an Office Communications Server 2007 using an Office Communicator 2007 R2 client.
There are architectural changes introduced into Office Communicator 2007 R2 that are only compatible with Office Communications Server 2007 R2.
On Office Communications Server 2007, you can select to block Office Communicator 2007 R2 clients from connecting.
Right now I use office communicator 2007 R2. And it connected to OCS 2007. :-)
Welcome to "Unsupported-ville," population: you. :)
who say that it`s in production.
But... good for migration, I think
If it works, that's certainly good news.
What has happen to your developers? They have got some kind lazy -pills? Otherwise it is very hard to understand that why there are no compatibility for old server version.
It should not be rocket science to add clients a check the server version and behaves like that.
Hope you are not planning to share the pills with Office and Outlook teams!
I have R2 Client working against R1, Only issue this far are with Enterprise Voice, issue being you cannot forward or SIM ring calls anymore :-(