MOR Carrier Class
From KolmiSoft Wiki
This solution will let to connect as many Asterisk servers as necessary.
OpenSER servers will handle registering, load-balancing and fail-over.
Asterisk Servers will do routing, billing and will be gateways to providers.
MySQL servers will be connected using MySQL Replication for best performance.
System is very scalable - 1 OpenSER server can handle up to 20 Asterisk servers.

