asterisk users - May 2010 - Asterisk Sip Proxies and SIP persistence

All,

    I am looking into open source idea's for something I play with on 
the closed source side. What I am thinking is to get two Asterisk PBX's 
behind a single SIP proxy to load balance calls inbound, and potentially 
outbound to an external sip provider, with the potential of multiple 
provider type lines (SPA3102, and a sip provider) that allows the call 
to persist.


What I am looking at is something like what I do at work. Having an F5 
with a SIP VIP configured, with persistence set up to follow call-id, or 
from, or to, or what ever ends up being best for my environment 
(Typically call-id) between 2 to 30 sip servers/engines.

Since this is more dev/research as a way of saving 12,000-38,000 on a 
device for testing and learning more in depth on sip in transit in a 
home lab environment, I am after something that can do something like 
that, though not expecting the performance of an actual F5, or anything 
like that.


Thanks in advance,
Seann Clark
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