The results from the survey are in and you have spoken. Who is the best positioned successor to Microsoft Response Point? 3CX came in first place! pbxnsip had a very strong showing and came in second. During the survey pbxnsip was leading the way for some time and (I'll admit) I was a bit surprised to see that.
This is a somewhat interesting competition here since I've co-written a book on 3CX and am a Certified pbxnsip Partner & recommend pbxnsip!
I have to agree that 3CX is probably the closest Windows phone system to compare to Response Point in various ways: Ease of use is paramount, a very Windows-like interface, and the industry's best support for automated PSTN/PRI gateway setup. 3CX is targeted at do-it-yourself and generalist IT market. On the cons side it has a smaller feature set, few system monitoring options and due to its rapid developement our experience has been it has little day to day "bug-a-boo" issues. 3CX has a large community and market awareness around it.
pbxnsip is a bit more mature, has a more generic web interface that is nice but not distinctly Windows (pbxnsip runs on Windows, Linux, Mac & plugcomputer). Finally stability, security, scalability and feature set have been given more attention than ease of use with pbxnsip. pbxnsip has a smaller but more mature & savvy VOIP reseller base that includes a fair amount of partners providing hosted phone systems to their clients.
OCS and Cisco also got quite a few votes. Don't forget that Microsoft appears to be positioning OCS Hosted as a replacement for RP. I believe with CS "14" they might be able to pull it off. Check my article on hosted OCS here.
Thanks for contibuting to this survey!