Also, I cannot agree with the stance than open source technologies are unsuitable for core softswitches. All open source engines out there today are just technology cores; a great deal of middleware, integration and application is required to turn them into service delivery platforms. ?That makes them a lot like the commercial protocol stacks, e.g. Radvision, used in commercial products.? Architecture is of the essence. A well-architected, clusterable Freeswitch platform (or, say, Kamailio, as in our case) is much more reliable and capable than a badly implemented commercial platform with crappy vendor support.? -- Alex?Balashov?|?Principal?|?Evariste?Systems?LLC 303?Perimeter?Center?North,?Suite?300 Atlanta,?GA?30346 United?States Tel:?+1-800-250-5920?(toll-free)?/?+1-678-954-0671 (direct) Web:?http://www.evaristesys.com/, http://www.csrpswitch.com/ Sent?from?my?BlackBerry.