[OpenSIPS-Users] Opensips+Multiple backup servers

[osiris123d]

I believe it will also depend on whether or not your phone clients are behind
a firewall or not.  If they are then you will have to worry about the fact
that if the OpenSIPS proxy that the client first registered with goes down
then the backup OpenSIPS proxy will not be able to send the client messages
since the NAT Firewall doesn't have a pinhole opened up for that backup
OpenSIPS router (this assumes that the backup OpenSIPS router has a
different IP address from the primary).  A way around this would be HA. 
Another option would be if the NAT Firewall/WAN Router has some kind of SIP
functions like the Edgewater Network EdgeMarc devices.

Another option is the fact that most IP phones can be configured with a
failover Registration Server IP.
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