Yes HAAst can create a High Availability LCR / Proxy server cluster for you.
HAAst’ health detection will automatically shutdown a failing LCR/proxy and start a healthy LCR/proxy. HAAst’s synchronization capabilities will keep the dialplan in sync between peers, and also all of your cost data in the MySQL tables. HAAst can even start/stop unrelated services (perhaps relating to LCR), customize data unique to each LCR/proxy, and more.
HAAst has no problem with 1500 simultaneous calls, or setups, per second.