Hardtime using LCS SP1 and OCS 2007 R2

We are actually using both LCS SP1 and OCS 2007 R2 for our communication environments. But we are having a hard time on using them. First, LCS users can not view who are present in OCS. On the other hand, OCS responds slowly to consider it for chatting. The users can exchange messages to other line but it needs to refresh from time to time. Is there any problem on our setting?
