Why are you overcomplicating your network and draining your pockets with all of these seperate systems? You may want to look into a solution that will give you the ability to adapt to the market NOW rather than waiting on someone else to come up with something for your situation a few years down the road. By then, it will be too late. Take a look at Asterisk. The best kept secret of telecom. I’m going to upset a lot of cisco and quintum sales people but look at http://www.asterisk.org and http://www.digium.com. The source code is there, if you need it it can be built NOW! Stop wasting your money and throw linux on a box and get moving today!