[Asterisk-Users] OT: SIP aware firewalls?

[Technical Support]

I suspect that there might be more to this question than has been answered
so far.  Most firewalls will allow you to open and forward a port range;
thus they are "SIP" compliant.

However, if you want more than one SIP client behind your firewall, you will
want a firewall with a SIP application filter (to intelligently direct the
SIP & RTP packets to the right client).  

So if I can rephrase your question for the group, are there any (linux?)
firewalls with SIP & RTP application filters?

We managed to build a rudimentary ISA Server application filter for SIP &
RTP, but nothing commercial quality.

Michelle Dupuis
Technical Support Specialist
Oxford Consulting Group Ltd.
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