It doesn’t look like you know much about voip or sip in particular.
Even your company uses b2bua for LCR not a SIP server, don’t you know that?
Which brings another huge limitation of PortaSIP, no one mentioned before. If I shell 40K to buy your product for LCR, I can not route in h323 (so I loose all of my low costs carriers), and even in SIP I’m quite limited in choice of carriers, because your b2bua support SIP reorigination only with media flow around.
I evaluated your company in depth. There is gap between what you talk about in presentations and demos and what can be accomplished in reality.