[OpenSIPS-Users] Is opensips a front end to asterisk?

[John Quick]

> Date: Fri, 3 Jul 2009 10:02:42 -0500
> From: "lists at grounded.net" <lists at grounded.net>
> Subject: Re: [OpenSIPS-Users] Is opensips a front end to asterisk?
> To: users <users at lists.opensips.org>
> Message-ID: <20097310242.197138 at leena>
> Content-Type: text/plain; charset="us-ascii"
> 
> > I recommend that you don't try to run OpenSIPS on a NAT'd server. I tried
> > recently and have been
> > regretting it ever since. It is not designed to be behind NAT, although it
> > is great for handling UA's that are.
> 
> Bit confused about this. Our asterisk machines have always been behind a firewall and on NAT IPs.
> My thought was to use opensips at it's own location, sending the traffic to at least two separate
> locations for load balancing and redundancy. I'm not sure how I could avoid using NAT?

Asterisk works fine behind NAT, but OpenSIPS does not. Asterisk has a parameter, externip, you can set
that tells it what its external IP address. I am not aware of an equivalent in OpenSIPS. You would
avoid NAT by having multiple static IP addresses assigned to a DMZ or even directly connecting the
OpenSIPS server to the Internet and using iptables to block unwanted connections.

I'd be interested to hear from other users/developers of OpenSIPS on this subject.

John