I would be very surprised is anyone uses WatchGuard SIP ALG.   For the past 12 
years the advice has always been "Disable SIP ALG and let Asterisk do the NAT 
fixup itself" on any firewall, regardless of brand.    I wish you the best of 
luck.

-----Original Message-----
From: [email protected] 
[mailto:[email protected]] On Behalf Of Tony Mountifield
Sent: Tuesday, April 22, 2014 12:12 PM
To: [email protected]
Subject: Re: [asterisk-users] Anyone used WatchGuard SIP ALG?

In article 
<CAHE6+j3hb5d8mJfY69F73TVwZus9ZAQrDakt4+iW+tx58_uZ=g...@mail.gmail.com>,
Ishfaq Malik <[email protected]> wrote:
> On 22 April 2014 16:24, Tony Mountifield <[email protected]> wrote:
> 
> > Has anyone here used Asterisk inside a WatchGuard firewall, talking 
> > via the WatchGuard SIP Application Layer Gateway to an outside SIP service?
> >
> > I have a customer doing just that, and I am 100% convinced there is 
> > a bug in the ALG regarding the media port number it inserts into the 
> > SDP when it rewrites it. However, either they or WatchGuard will not 
> > accept there is a bug, despite my very detailed description of it.
> >
> > So if anyone else has any experience of using this product, I'd be 
> > very interested to hear from you. Thanks!
> >
> Just about every SIP ALG (Watchguard included) makes things worse or 
> simply not work.

Maybe, but that doesn't mean the concept is flawed. It should be possible to do 
it correctly.

> Have you tried to simply disable it?

Yes, the customer has tried that, but since NAT is involved, the lack of SDP 
rewriting means that the media streams do not get routed correctly.

But I am specifically looking for people with experience of this particular 
product, rather than for general advice, as I am seeking support for my 
assertion that it has a specific bug that the vendor needs to acknowledge and 
fix.

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