Has anyone used any terminals with VOIP? It looks like only the L230 uses speaker and mic....but can this used for making calls over the internet when using 10 units on one server?

Do you use the mic and speaker jack on the L230 when making calls- or only the ciso phone?

We  only use the phone, are you trying to make the Station do the voip call?

If all the stations are connecting to one nic you may end up with a network band width issue.  

You will also have to check the software to make sure it allows multiple users ( at the same time)