Christian Schlatter writes:
This mode ensures that all SIP registrations are directly written to the 'location' mysql table, without being buffered in a memory cache. Since mysql cluster uses in-memory databases, performance is pretty good even with db_mode 3, at least if you run a cluster data node on the same host as openser.
some of the presence stuff does not work with db_mode=3. what is the disadvantage of using mode 1 or 2 in the proxy that receives register request from user and 0 in others?
-- juha