If the user is being ideal for 5 min , his session expires. How to extend the session

Hi,

I have created a group chat using Xiff. The users are listed in the roster. If the user is ideal for 5 min the users list disappears , and even if v login again, i am not able to get the roster list. I hope this is due to the session time out. Can anyone tell me how to extend the session time.

Thanks

Probably this is not actual anymore, but this is the information about idle settings http://www.igniterealtime.org/community/docs/DOC-2053