I'm reading some information that recommends using SER / OpenSER for
large installation to offload SIP traffic from the Asterisk server.
http://www.voip-info.org/wiki/view/Asterisk+at+large
However, it looks like the information might be dated.
I'm looking at a potential 750 SIP phone and 150
I prefer multiple servers sharing the load. All asterisk based. This
let me scale up the power of the system just adding more servers. I
use asterisk 1.8 realtime with all the data (peers, voicemails, ivr
messages and so on) stored in a pair of mysql database with
multimaster replication. Phones
