Thanks for your responses. Because this was so easy to install with 10.04 (and fast) I'm willing to try to install either of the "bleeding edge" versions. If you need/want asterisk and have experience with it, which version would you recommend? 12.04 or 14.04 if you want your phones to work and you still have not converted your Cisco 7970 phones to SIP from SCCP? Conversely, which version is getting the most development effort at this point?