This discussion moved to Openfire support
This is Testing General space/forum, so i think this thread should be moved to Openfire Support.
As about your question. You dont have Openfire installed yet? So, if you only need audio sessions maybe there are some other ways to do this than installing jabber server. Of course you can setup Openfire in your local network, system requirements are mostly about RAM, the more the better. I’m running it with linux on a box Celeron 2.6 GHz and 256MB RAM for 170 (130 concurrent) users and it works fine so far. And you can use Spark client (developed by same people as Openfire, you can find it in Downloads section) to chat. Spark also has voice chat built in which can help you achieve your task. Must say that Openfire and Spark are written in java, so your client machines should have at least 512 MB of RAM (Windows XP), and even then you can notice some slowiness of Spark, especially after long idle time.