Since you figured out how to disable the directory search, I'll let you know that you can control the presence visibility by using a SUBSCRIBE Calling Search Space https://www.ciscopress.com/articles/article.asp?p=2471644&seqNum=5.      

Without logs, we are just guessing. Here's the most common problem with the scenario you described https://community.cisco.com/t5/collaboration-voice-and-video/troubleshooting-no-audio-issues-on-hair-pinned-calls-on-the-cube/ta-p/3676035 I recommend ...