What is your home Sametime Server field set to? Anar Taghiyev 5.Aug.08 09:52 AM a Web browser Online Meeting Center/Meeting Room 7.5.1 CF1Windows
If you use Domino Directory for authentication, I'd check your person document and see what you have the Sametime server (Instant Messaging) field set to.
If you use LDAP for authentication, I'd check whatever field you have specified to be your Sametime server field in your LDAP server.
The Meeting Room Client (MRC) will try to establish a community connection to the server specified in this field. If this happens to be an internal Sametime server (for example, with IP 192.168.x.x) and you are attending from the outside, then the MRC won't be able to resolve/reach the Sametime server and will disconnect.
There could be other reasons and checking this field value would be a start.