I've got a question about using sipX as a trunking proxy....

We've set up an arrangement with a local SIP trunking provider to  
allow our clients to proxy through us so they can connect to their  
service.  The reason we've set this up is because they actually don't  
want to get into the business of setting up trunks, only endpoints.   
So, by setting up trunks with us, we'll be responsible for setting up  
trunks to the end-users on our system, then relaying the calls over to  
them (authenticating as us).  Actually, they're just doing it with  
static IPs (no authentication).  What I'm looking to do is set up two  
servers (HA - eventually growing to 4 across 2 locations).  We'd  
program a trunk from our servers to the carrier, then individual  
trunks to our customers.  We'd merely act as a relay/proxy.  I'm  
assuming sipX would only accept phone call requests from trunks if the  
request came from the pre-programmed IP on the trunk, and not just  
randomly accept call requests.  This would have NO USERS built, only  
trunks.

I know there'd be no end-user usage of the portal and all that, but  
for what I'm looking to do, does anyone see any major security risks  
with this?

Thanks.

Kristian D. Guntzelman
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