Iptables breaks a working VoIP phone?

Michael L Torrie torriem at chem.byu.edu
Mon Oct 29 10:02:22 MDT 2007

Corey Edwards wrote:
>> There's certainly a Linux SIP proxy.  It's called Asterix!
> Bzzzt! Asterisk is not a SIP proxy. It's an end point. It's a common
> mistake and the difference is somewhat subtle, but it is important.

Sigh.  I guess I should have added some xml tags to my reply to give
tone and meaning.  But, of course.  And really, though, asterix is the
real solution to his problem. By moving the SIP endpoint to the
firewall, and then having his phones talk to Asterix, this eliminates
the problem quite nicely, and provides a tremendous amount of

So basically I'm saying the answer to his problem is probably not a SIP
proxy, although that would work.

> If you would like a proxy, there are two great ones I would recommend,
> SER and OpenSER (I'm partial to the latter myself). I'm doubtful that a
> proxy is required. Clearly removing NAT is the best solution, but then
> again I'm a NAT-hating bigot so don't take my word for it. But there
> should be a way to get it to work even with the NAT. Knowing where your
> packets are actually going will help a lot.
> Corey
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Michael Torrie
Assistant CSR, System Administrator
Chemistry and Biochemistry Department
Brigham Young University
Provo, UT 84602

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