in our scenario we have two wireless phones on a AP1230. We can dialing out on both phones. We also can dialing direkt from one 7920 to the other 7920, but we have only noise in the line. Over a conference call whit a other phone we can speak from one 7920 to the other 7920 . When we are using two AP and the on phones conect to the first AP and the second phones connect to the second AP then it also works fine.