[OpenSIPS-Users] OpenSIPS SIP/RTP proxy for DRBD asterisk cluster

[Cullen Lorsung]

I am building an asterisk failover cluster for a customer, and plan to have
a proxy in front of it to proxy SIP and media, so in the even that one of
the systems goes down, we may not lose the call.  Just wondering if anyone
has any experience with this, or can point me in the right direction.  Here
are a few of my requirements:

-Telco is SIP, will be using a dedicated interface on the server, so I'll
be binding OpenSIPS to both and inside/outside interface.  Any problems or
doing so?
-I'd like to use IP ACL for both telco gateways and local PBX - what's the
best way to do this?  Ideally i'd want to handle this within OpenSIPS
(rather than iptables or similar), so i can log errors/attacks, and debug
on the far end in case my ACL is wrong.
-Would registration from the PBX make sense, so that during failover any
topology changes will be more visible?
-Not sure that presence is important, although I can see this making it
simple to see what servers/gateways are up at any given point.  Thoughts on
this are appreciated (under what circumstances might this be important?)
-I don't think NAT will be an issue, as my understanding is that the telco
will be providing an interface on the local network, or at least a local
address, but your experience with this sort of thing again would be
appreciated.
-The proxy should stay in the media path, like I said, to hopefully hang
onto calls while servers fail over.
-I'd just as soon not have a GUI, as I've seen what's out there and don't
think any of them are terribly helpful.  Possibly once I understand the
syntax better they will make more sense.  Any advice you have, if you could
keep it within command line syntax/configs, that would be very helpful

Any help with these topics, or advice on the general idea would be
appreciated.  I will continue to bang on what I've started with and come
back with any questions.

Thanks!
Cullen
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