The creation of high-loaded voip system

you want to create and maintain in the future voip system is predominantly transit traffic with the following requirements:
1. Administrative GUI to configure voip system, add system users, generation of reports and statistics.
2. Voip the core must be open source software(FreeSWITCH, Asterisk).
3. Support both SIP and H323, ISDN desirable.
4. The presence of the possibility of having management accounts to generate statistics and possible editing of routes.
5. Real-Time monitoring of current calls: the number, filter, etc. and etc.
6. Perhaps the most important point – acceptable performance.