I've seen a few threads about a HA setup, most look to deal with keeping calls up. What I'm interested in, would be a way to sync registration data between 2 servers to provide a hot standby. The problem i've encountered is whenever there is a failover, there will be a period of time where incoming calls to endpoints will fail until the expiry timer forces them to re-register.

Would it be possible to add an option to store the registration data in a file as opposed to ram? If its a performance issue, a ramdisk could be used. Then it could easily be synced between 2 servers.