I am using nexvortex, unlimited concurrent incoming calls, on one or many numbers. I use one incoming number. That number is setup as an externel line in axon, you only need to setup one line. Then you setup the extension to send the call, the extension then handles the call flow. I send the call to IVR, then loop thru a call que for the next available ext. the ivr is setup to handle 20 incoming calls which is about 50 percent higher than my peak volume. If you are not using IVR then you could send the call to a group in axon and manage the call that way or IVM. Axon will keep sending calls to that extension and it is the extensions job to handle them (what ever the extension maybe- IVR, IVM, Phone or to an group). When setting up the extension you mayhave to set the User ID as the incoming DID and then on the advance page setup for that extension ... "Use a different User Name just for authentication" then enter your username. Think of incoming as calls not lines. To make it simple 1 incoming DID = unlimted incoming calls (depending on provide of course). hope this helps.