Sametime 8.5 - ad-hoc-meeting-room

i´ve posted the same in sametime-forum this morning, possibly someone can help me here:

Hi everybody,

I´m new to sametime 8.5.

I ran sametime 8.0.2 on a domino-server 8.5.1fp1 and everything worked fine; I could use ad-hoc-meeting rooms from either web, notes, or connect-client.

Now after installing /upgrading to sametime 8.5 standard server, I cannot use ad-hoc-meeting rooms. I can just chat and see the availability of other users.

what is missing?

I authenticate against domino-directory and on domino-server-console it says:

Sametime ActivityPro Sametime ActivityProvider

stmeetingserver Sametime Meeting Server

Sametime Server Running

In the web-server-console of the sametime-server (administer server) everything except “sttelephonyservice.exe” is up and running

I just need ad-hoc meeting-rooms, like I was used in 8.0.2, no other.

How to go on?

Do I need additional server components installed?

Do I need the whole meeting-server installed?

Do I need LDAP-authentication installed?

Do I need DB2 and Websphere installed?

Pleas give me some hints!!

Thanks in advance …