Good day,
I am looking at various PBX solutions and have had lots of luck with PBXNSIP as it handles the SIP over TCP issue fine.
Now instead of spending a lot of money on PBXNSIP im wondering if anyone has used any open source PBX's (hopefully running on windows) that are easy to setup and get working with Speech server. Essentially I wish many users to register on my PBX and then dial my speech server and run the app I have developed. I can do all this currently but only with commercial software called PBXNSIP.
I have read a lot of info about various open source PBX's being able to do this but they have to use a SIP proxy and its at that point I get lost 
Thanks in advance for any help.