Have you heard about FreeSwitch? It’s an open source Asterisk competitor that is positioned as more of a soft switch rather than a PBX. It appears to have a more scalable design and perhaps even 10x more call processing power per server. I can’t find any information on their site where FreeSwitch supports analog or digital telephony boards. At first I thought that this would be a problem for the platform but after giving it more thought I think that this is perfect in this Web 2.0 age. Everything is moving to the network as the platform and SIP is the VoIP protocol of choice. Could we create a PhoneSystem.net solution running on FreeSwitch?
Let me know (chris [at] getvocal.com) if you are interested in helping with this endeavor!