asterisk users - May 2004 - Sonicwall with Firmware 6.6.02 - SIP?

Sonicwall now has "SIP transformations" check box in
the Access section of the interface - does anyone know
how to make sense of this function?  Tech support is
useless, and the help description is confusing.  Using
on office network to connect Grandstream and Cisco
phones to asterisk PBX at remote location.  I hate to
use linksys or belkin, but they're (ironically) the
only 2 that have worked so far...sure hate to use
crappy equipment for mission critical stuff.

Cisco 827/837 works fine for me .

Simon

-----Original Message-----
From: asterisk-users-admin@lists.digium.com
[mailto:asterisk-users-admin@lists.digium.com] On Behalf Of Sean Magnuson
Sent: Thursday, 13 May 2004 14:48
To: asterisk-users@lists.digium.com
Subject: [Asterisk-Users] Sonicwall with Firmware 6.6.02 - SIP?

Sonicwall now has "SIP transformations" check box in the Access
section of
the interface - does anyone know how to make sense of this function?  Tech
support is useless, and the help description is confusing.  Using on office
network to connect Grandstream and Cisco phones to asterisk PBX at remote
location.  I hate to use linksys or belkin, but they're (ironically) the
only
2 that have worked so far...sure hate to use crappy equipment for mission
critical stuff.
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> Sonicwall now has "SIP transformations" check box in
> the Access section of the interface - does anyone know
> how to make sense of this function?  Tech support is
> useless, and the help description is confusing.  Using
> on office network to connect Grandstream and Cisco
> phones to asterisk PBX at remote location.  I hate to
> use linksys or belkin, but they're (ironically) the
> only 2 that have worked so far...sure hate to use
> crappy equipment for mission critical stuff.
I'd have to guess (no direct experience) the sip transformation
means the firewall will track the sip/rtp port negotiation
process, and automatically open the negotiated rtp ports
for audio. 

I'd also have to guess the function will only work under
some specific conditions as the sonicwall engineering process
seems to only involve limited conditional testing before
releasing code to the public.