Thank you all for your responses,
Vladimir: Never looked into sipwise, thank you for the link. The only problem is there Linux HA capabilities is not offered in CE, only PRO...
Alex: Nice documentation based on Kamailio! If we choose this product it will be a perfect reference point.
Henning: Just coming out of university as a research student, causes me to have a 'DUH' moment. Of course! Oholoh.... I use to tell other students about it when trying to pull up information regarding test data for ArgoUML and Eclipse (Java projects commonly used in experiments....). Totally slip my mind. In terms of Sip Router vs. Kamailio, is it safe to say the former is a subset of the other? I.e., both function on the same core that provide SIP trunking, proxy and termination services, and Kamailio contains additional features such as B2B etc...?
In terms of clustering, high availability, and more importantly load balancing, what is offered across the board. In terms of "made to scale" this is extremely important to us.
Thanks in Advance!
Cheers,
Nick