Most ALG's cause one way audio. :) If you don't mind filling out a form there is a good doc from Acme Packet comparing SBC's to ALG's. http://lphs.acmepacket.com/comparing-sbcs-to-firewalls/ On Feb 27, 2013, at 4:33 PM, John Levine <johnl at taugh.com> wrote:
I realize that an ALG is a hack in a router that is supposed to allow SIP packets to go through a NAT router. I also realize that for modern SIP equipment, ALG usually causes more problems than it solves, and that it's described in RFCs 2663, 3424, and others.
What I can't find anywhere is what a SIP ALG actually does to the packets. Is that written down anywhere, or is it just network folklore?
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