[OpenSIPS-Users] Failover without Virtual IP

[Muhammad Danish Moosa]

I have a pair of opensips stateful proxies and am trying to achieve
Active-Passive failover model with clusterer dialog replication. Primary
Proxy is working in the middle of  2 SBCs and all nodes are within the same
network so NATing is NOT involved ;secondary proxy is accessible through
VPN. It's pretty simple configuration, proxy is just adding and removing
headers in the middle.

So if I stop the opensips service on primary IP , SBCs blacklist that and
start sending new invites to secondary IP that takes active state. That's
all good.

But if I reproduce this failover during a connected session , SBCs do not
send mid-dialog requests/responses to failover IP. I can see they still try
to send messages to primary SBC which obviously end up with timeout. I
understand the most natural solution is HA with Virual IP but it's not
possible because secondary IP is accessible through VPN.

I tried to use DNS SRV record with priorities but that also does not work
with mid-dialog messages, I also have tried to change record-route/via
header to fqdn through advertise_address. Its not changing record-route but
via only but I am still not getting expected results.

Any guidance of possible solution(s) here will be appreciated.

-- 
Muhammad Danish Moosa
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