[Users] Asterisk Integration

Hi List members, I am planning to bulid a system for large scale deployment. Looking at Openser features and Asterisk capabilities I decided to build a system on these platforms, but faced the problem of integration. What is the best method of integration ? I read some columns in the docs, and can not decide... I came from the network world and can understand protocols and IP communication quite well. I think I should do the following : CLIENT <---> Internet <---> Openser machines (load balanced) <---> Asterisk machines (behind NAT, also load balanced, doing mainly codec conversion and switching logic) My guesses are : - use dispatcher on the frontend(s) - do not use dispatcher, but rewrite the packets by some programmatical way - any other solution ? I'd like to spare some energy on this not to start developing some not working solution ;) Thanks in advance, Pal Vig