We have some physical servers that we cannot virtualise because they are connected to analog modems for alert paging.

We need to retain this functionality, but virtualise the servers and reduce the pile of individual modems down to something that can be rackmounted in a minimal number of U.

So I guess I'm seeking a stack something like this:

* Rackmount bank of 8-16 modems
* Network connectivity from the modem bank onto the network
* Some kind of client software on the VMs that allow them to create a modem COM port, via the IP connection

I'm already familiar with a partial solution - MOXA make an IP-connected serial server that can connect to a bunch of modems. This works in exactly the manner we need, but it doesn't go as far as integrating the modems - So we still have a bunch of them sat on rack shelves.

Can anyone point me in the right direction on this?

Edit: I'm thinking I can probably get closest to what I'm after by stacking [one of these](http://www.multitech.com/en_US/PRODUCTS/Families/CC1600-Series/) with [one of these](http://www.moxa.com/product/NPort_5650.htm). I was hoping there would be an integrated, single-unit solution but maybe not.